a of St3T\<

. Bldg

PB 161643

^ecknic&l /Jote 142

ATLAS OF FOURIER COEFFICIENTS

OF DIURNAL VARIATION OF foF2

WILLIAM B. JONES

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
THE NATIONAL BUREAU OF STANDARDS

Functions and Activities

The functions of the National Bureau of Standards are set forth in the Act of Congress, March 3, 1901, as amended by Congress in Public Law 619, 1950. These include the development and maintenance of the national standards of measurement and the provision of means and methods for making measurements consistent

with these standards; the determination of physical constants and properties of materials; the development of methods and instruments for testing materials,- devices, and structures; advisory services to government agencies on scientific and technical problems; invention and development of devices to serve special needs of the Government; and the development of standard practices, codes, and specifications. The work includes basic

and applied research, development, engineering, instrumentation, testing, evaluation, calibration services,

and various consultation and information services. Research projects are also performed for other government

agencies when the work relates to and supplements the basic program of the Bureau or when the Bureau's

unique competence is required. The scope of activities is suggested by the listing of divisions and sections on the inside of the back cover.

Publications

The results of the Bureau's research are published either in the Bureau's own series of publications or

in the journals of professional and scientific societies. The Bureau itself publishes three periodicals avail- able from the Government Printing Office: The Journal of Research, published in four separate sections,

presents complete scientific and technical papers; the Technical News Bulletin presents summary and pre- liminary reports on work in progress; and Basic Radio Propagation Predictions provides data for determining

the best frequencies to use for radio communications throughout the world. There are also five series of nonperiodical publications: Monographs, Applied Mathematics Series, Handbooks, Miscellaneous Publications,

and Technical Notes. A complete listing of the Bureau's publications can be found in National Bureau, of Standards Circular

460, Publications of the National Bureau of Standards, 1901 to June 1947 ($1.25), and the Supplement to National Bureau of Standards Circular 460, July 1947 to June 1957 ($1.50), and Miscellaneous Publication 240,

July 1957 to June 1960 (Includes Titles of Papers Published in Outside Journals 1950 to 1959) ($2.25); avail- able from the Superintendent of Documents, Government Printing Office, Washington 25, D. C.
NATIONAL BUREAU OF STANDARDS

technical ^Ttete

142

APRIL 1962

ATLAS OF FOURIER COEFFICIENTS

OF DIURNAL VARIATION OF foF2

William B. Jones

NBS Boulder Laboratories

NBS Technical Notes are designed to supplement the Bureau's regular publications program. They provide a means for making available scientific data that are of transient or limited interest. Technical Notes may be

listed or referred to in the open lit. rature. They are for sale by the Office of Technical Services, U. S. Department of Commerce, Washington 25, D. C.

DISTRIBUTED BY

UNITED STATES DEPARTMENT OF COMMERCE

OFFICE OF TECHNICAL SERVICES

WASHINGTON 25, D. C.

Price $2.50

ABSTRACT

A series of graphical representations is given for illustrating

the regular and continuous geographic variations of Fourier coefficients

a. and b. obtained from the diurnal analysis of foF2 monthly medians,

J J including their main latitudinal trend, mixed latitudinal and

longitudinal variation, and the effect due to noise (random fluctuation

in the original data) . To illustrate the systematic changes in these

variations with seasons and with solar activity, corresponding graphs

are given for four seasonal months for minimum and maximum years of

solar activity ( 195*1- and 1958)

111
ATLAS OF FOURIER COEFFICIENTS OF DIURNAL VARIATION OF foF2

CONTENTS

Page

1. INTRODUCTION 1

2. THE BASIC INPUT DATA 3

3. FOURIER ANALYSIS 5

k. DESCRIPTION OF THE GRAPHICAL REPRESENTATIONS 7

ACKNOWLEDGEMENTS 11

5 . REFERENCES 12

GRAPHICAL REPRESENTATIONS

Constant Term a

Q lk-YJ

First Harmonic 18-25

Second Harmonic 26-33

Third Harmonic S^-^l

Fourth Harmonic k2-k-9

Fifth Harmonic 50-57

Sixth Harmonic 58-65

Seventh Harmonic 66-73

Eighth Harmonic 7^-8l

Ninth Harmonic 82-89

Tenth Harmonic 90-97

Eleventh Harmonic 98-105

iv
1. INTRODUCTION

A solution has recently been given [Jones and Gallet, 1962] to

the problem of representing the complex properties of ionospheric

characteristics on a world-wide scale, including their diurnal variation,

by numerical analysis of ionospheric data as they are measured at the

stations, without prior hand operations. In the solution referred to

above, the analysis is made in two main parts, (l) The diurnal

analysis is performed by Fourier analysis of the 2U hourly measurements

from each available station. The resulting Fourier coefficients are

then corrected to local mean time (LMT). (2) The geographic analysis

is made by expanding the world-wide geographic variation of each

Fourier coefficient in an orthonormal series of functions of latitude

and longitude, which are linear sums of surface spherical harmonics.

Special filtering processes are employed in each part to obtain an

optimum separation of noise (random fluctuation of the ionospheric data)

from the real physical variations.

The Fourier (time series) coefficients are corrected to LMT so

that their main geographic variation becomes latitudinal. In addition

to the main latitudinal trendy however, there is also a less important

For a brief summary of the problem and solution, the reader can refer

to Jones and Gallet [i960]
-2-

but physically significant mixed latitudinal and longitudinal variation.

Superimposed on the real physical variations is an effect due to noise

which is small in amplitude hut "which "becomes the dominant part in the

high order harmonics.

The purpose of this atlas is to illustrate - "by means of a series

of graphs - the variations mentioned ahove and to show their systematic

changes with seasons and with solar activity. The regularity and

continuity of these phenomena were essential to the solution of numerical

mapping which has "been given. Although more objective methods (such as

numerical analyses and statistical tests for significance (have "been used

for studying the physical variations and the effects of noise, graphical

representations of the type given here have guided the development of

the mapping methods and have added insight and understanding to the

complex physical properties of the ionosphere to he represented.

The ionospheric characteristic which we have used here is the monthly

median of the F2-layer critical frequency (foF2), partly for the purpose

of illustration hut also since it is the most interesting and important

from the viewpoint of practical applications of radio propagation.

Similar studies have also been made for other characteristics such as

the 3000 km maximum usable frequency factor (F2-M3000). For this case

the physical variations are much weaker than for foF2, but regular and

continuous variations are again observed as well as systematic longterm changes due to seasons and the eleven year solar cycle.
-3-

2. THE BASIC INPUT DATA

The' basic input data used for the present series of graphs

consist of the 2k hourly medians of foF2 from all available ionospheric

stations for the four seasonal months, March, June, September, and

December, for each of the last minimum and maximum years of solar

activity (195^ and 1958) • Table 1 gives the total number of stations

available at the time this study was made and the Zurich sunspot

numbers for each month. The data were punched on cards as they had

been tabulated in ionospheric booklets (or in some cases on microfilm)

without prior smoothing. In a few cases it was necessary to reject

data from certain stations if, for example, so many consecutive hourly

values were missing that the diurnal curve could not be defined, or if

the data were grossly inconsistent with those from closely neighboring

stations. For the IGY year (1958) there were about twice as many

stations as for 195^> and so the world-wide coverage was considerably

better, particularly in the southern hemisphere.
-kTABLE 1

1954 1958

Mar. Jun. Sep. Dec. Mar. Jun. Sep. Dec.

Number of Available

Stations 66 68 63 6k 118 118 113 118

Zurich Sunspot

Numbers

A. Monthly Mean 10.9 0.2 1.5 7.6 190.7 171.5 201.2 I87.6

B. 12 Month

Running Average 4.2 4.2 7-8 12.0 201.3 186.8 183.8 180.5

Average Standard

Deviation (Mc)

for High Order

(noise) Harmonics

For all Available

Stations 0.049 0.0^3 0.055 0.055 0.072 O.069 0.084 O.O78

For Selected

Latitude Bands:

60° < \ s? 90° 0.030

(T)

0.016

(11)

0.022

(7)

0.030

(6)

0.092

(28)

0.043

(28)

0.075

(28)

O.O87

(27)

30° < \ ^ 60° 0.032

(26)

0.030

(25)

o.o4o

(23)

0.043

(23)

0.055

(ki)

0.035

(39)

0.058

(42)

0.064

(39)

-30° < X ^ 30° 0.069

(23)

0.06l

(22)

0.081

(23)

0.075

(2k)

0.081

(28)

0.084

(32)

0.10

(24)

0.087

(34)

-60° < \ =5 -30° 0.043

( 8)

0.040

( 8)

0.035

( 8)

0.040

( 9)

0.066

( 9)

0.10

(10)

0.090

(11)

0.072

(12)

-90 g x ^ -6o° 0.032

( 2)

0.021

( 2)

0.038

(2)

0.035

( 2)

0.072

(12)

0.12

( 9)

0.12

( 8)

0.049

( 6)

*

(Numbers in parentheses indicate numbers of stations contained

vithin the particular latitude band.)
-5-

3. FOURIER ANALYSIS

For each station (Table l) a Fourier analysis is made of the 2k

hourly medians of foF2, thus decomposing the diurnal variation into

eleven harmonics

a, cos jt + b . sin jt = c. cos (jt — ilr.) (l)

3 3 3 3

j = 1, 2, . .., 11

and a constant term a which is the arithmetic mean of the data. The

variable t is used to denote the local mean hour angle which is

related to LMT (in hours) by

t = 15° (LMT) - 180°. (2)

For example, at noon LMT, t = 0°.

The coefficients a. and b. in (l) are related to the

3 3

amplitude c . and phase \Jr . by

o "

3 .

a. = c ., cos ilr. b. = c. sin ilr. 3 3 3 3 3 3

(3).

b

c. = la.+b. '4''. = arctan — . 3 M 3 3 3 a

1 The essential formulas for computing the a., b., c., and \Ir. are

3 3 3' 3 given by Jones and Gallet [1962] . The final term a..- cos 12 t

has been omitted since it does not form a complete harmonic and

also since it is produced mainly by noise.
-6-

Although the graphs in this atlas are restricted to the coefficients

a. and h . plotted against geographic latitude, with the help of (3)

one can visualize approximately the corresponding variations of

c . and i]r . . For example, the quadrant of the phase i]r . can easily he

deduced from the arithmetic signs of a. and t>. (see Tahle 2).

J J

TABLE 2

Location of the Phase ijr.

( v V Quadrant of the phase i|r.

(-, -) -180° < i]r . < - 90

(+ , -) -90° < T|r. < 0°

J (+ , +

)

0° < t. < 90°

(-

', +

)

90° < \|r. < 180°

3

As an illustration we see from the graphs of a. and h for

September 1958 (pages 18 and 19) that "both coefficients are mostly

positive, thus showing that the phase lies in the range 0° < i|r_ < 90°

(from which we .conclude that the maximum value of the first harmonic

occurs shortly after noon as one would expect) . On the other hand

from the graphs of a

p

and "b for the same month (pages 26 and 27) we

see that a

p is mostly positive and h« mostly negative, so that the

phase for the second harmonic falls in the range — 90° < "typ < 0°

.
-7-

k. DESCRIPTION OF THE GRAPHICAL REPRESENTATIONS

World-Wide Geographic Variations

The type of graph used here consists of the Fourier coefficients

a . ( and "b . ) from all available stations for a given month plotted

against the station latitude (l) , so that the main latitudinal trend is

emphasized. Such graphs are given for all months shown in Table 1, and

for all coefficients a , a., and b., j = 1, 2, . .., 11 (pages lk

to 10 5). Special plotting symbols have "been used to signify the

approximate station longitudes (0), so that in a sense the graphs are

three dimensional. As a result, it can "be seen that the coefficients

are not randomly dispersed about the main latitudinal trend, but --for

some harmonics-- they are systematically arranged according to longitude,

This effect is illustrated clearly, for example, in Figure 1, "which is

an enlargement of the graph of a for June 1958 • In this graph the

points in the northern hemisphere (20°N to 80°N) appear to fall into

one of two distinct groups. Almost without exception the points in the

lower group are from stations with longitudes "between 225°E - 3^-5° F,

and the points in the upper group are from stations outside this

longitude band. It can be seen from the graph of a~ for December

1958 that the reverse effect occurs in the southern hemisphere. The

same effect occurs in March and September 1958 ("to a lesser degree) and

also in 195^-.
-8-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1958 118 STATIONS

1—

T

12

oo

10

o

oro

T T T

J_

* o a * 9

Z

LONGITUDINAL CODE

o 345° E

- 45° E

a 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

ft 285° E

- 345° E ±

90° SOUTH

60° 30° 0° 30°

X=GEOGRAPHIC LATITUDE

60° 90° NORTH

Figure 1

B- 32500
-9-

Changes with Seasons and Solar Activity

The series of graphs given here have "been grouped by harmonics,

by months, and by years. In order to illustrate the strong seasonal

changes we have grouped the two equinox months (March and September)

and the two opposing solstice months (June and December) . These

seasonal changes are illustrated, for example, in the graphs of

a_ and b by the equatorial symmetry for March and September and by

the similarity and consistency of the graphs for these two months, and

by the asymmetry and reverse effects for June and December. The

effect of change in solar activity is seen mainly in the large

differences in amplitudes of corresponding graphs for 195^ and 1958*

Effect of Noise

The effect of noise (random fluctuation) in the original data on

the Fourier coefficients a. and b. is well known. It can be shown,

3 3

' in fact, [Chapman and Bartels, 19^+0] that the Fourier coefficients

a . and b . obtained from the analysis of random numbers

3 3

y_ , y , ..., y , — where the values y. are independently, normally

distributed with mean zero and standard deviation a - have independent

normal distributions with mean zero and standard deviation

a

a = —£=.- 0.289 <r. (h)

V12
-10-

The effect due to noise is Illustrated by the present series of

graphs. Although the noise affects all harmonics by approximately the

same amount, its effect is felt much more strongly in the high order

harmonics where the amplitude of the physical variation is below the

noise level. For foF2 medians the harmonics above order 8 are produced

mainly by noise, whereas the lower harmonics (with the possible exception

of 7 s&d- 8) represent mostly real physical variation [Jones and Gallet,

I962] . Thus, as would be expected (from the discussion above), the strong

geographic variations seen in the graphs of the low order coefficients

a. and b. gradually give way to the random effect due to noise in the

J J high frequencies. In fact, it can be seen from the graphs of a. and b.

(j=9, 10, ll) that the points are approximately symmetrically scattered

around zero in a more or less random manner. The spread of the points

about zero, however, appears to vary with latitude, suggesting a

variation of a (and hence of the noise a) with geographic position.

The average standard deviation o has been computed from (k) for

each of the months under consideration, the noise a in the original

foF2 medians being obtained from (4l) in [ Jones and Gallet, 1962]

.

Table 1 contains the values of o for all available stations taken

together as well as for selected latitudinal bands, so that the variation

in latitude can be seen. These values give not only the average standard

deviation of the high order (noise) coefficients but also an estimation

of the effect of noise in the low order harmonics.
-11-

ACKWOWLEDGEMEWTS

The author gratefully acknowledges the assistance received

from a number of persons. The computer programming was (performed

"by Mrs. Virginia L. Rios. The many graphs given in the present

atlas were rendered possible by the careful work of Mrs. J. Kaye

Myers. She was responsible for the preparation of the ionospheric

data on punch cards, the application of computer programs to

obtain the Fourier coefficients, and the plotting and preparation

of the graphs in the present form. Able assistance in assembling

the material and in typing the manuscript was given by Mrs. Anna

von Kreisler. Other persons contributing directly to this

publication include the operators of the Central Computing

Facility of the N.B.S. Boulder Laboratories.
-12-

5 . REFERENCES

Chapman, S. and J. Bartels, Geomagnetism, II, 572-582 (Oxford at the

Clarendon Press, 19^0)

Jones, W. B. and R. M. Gallet, "Ionospheric mapping by numerical

methods", J. of the International Telecommunication Union, No. 12

(Dec. i960).

Jones, ¥. B. and R. M. Gallet, "The representation of diurnal and

geographic variations of ionospheric data by numerical methods",

to appear in the NBS J. of Research, Section D, Radio Prop.

(1962).
SERIES OF GRAPHICAL REPRESENTATIONS OF

FOURIER COEFFICIENTS a. AND t> . FROM

3 3 THE DIURNAL ANALYSIS OF foF2 MEDIANS
-1kFOURIER COEFFiaENTS FOR foF2 MONTHLY MEDIANS do

18 MARCH 1958 118 STATIONS

» 1 1 1 1 1 1 1 l 1 | 1 1 | 1 1 _

16 —

• »

14 #

*

V *A u

• • • A 212 *

•

s . . V o * o • • • * —

»- # «• • gio > • 7 I —

o • » •

u. »

• —

1

u. * . • O 8 — .* * V

(T » * • • . — UJ ^# * o 56

* a

A • a •£ ^^ o o « •

u.

4

~"

2 "ill 1 1 l 1 1

1 1 1 1 1 1 1 1 30° 60° 90*

18 SEPTEMBER 1958 113 STATIONS

_l 1 | 1 I |

1 1 1 1 [ 1 1 | 1 i —

16 —

V —

14 V

*o • • » —

2 * ~*I2 A « « A o

o A

• A —

1- A V ujIO i 9

A a • • u * % *

->. A •%»

u.u. •*.'-"» -

o 8

* w A \f o o * A A « *•• „

UJ

9 **£ w» <S A

A £63 ° ou. — —

4 — -

2 —

1 1 l 1 1 l

I 1

1 1 l 1 1 l 1 1

SOUTH

60 c 30° 0« 30*

X= GEOGRAPHIC LATITUDE

80' 90' NORTH

LONGITUDINAL CODE

o 345° E- 45° E

D 45° E

- I05°E V 105° E

- I65°E A 165° E

- 225° E o 225° E- 285" E

ft 285° E

- 345" E
-15-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

18 MARCH 1954 66 STATIONS

16

1 1 f 1

i

1 1 1 ! 1 1 111)11

14 j

u i —

212 —

o

t-510 —

u. —

u.

8 * •• * (E _

_

UJ "

.

* * ° S6 *

A

• A V O

' V

u.

* • • •

4

A V

* •*

2

V

n 1 1 i 1 1 1 1 1

1 1 1 1 1 1 1 1 ~

90« 60' 30*

l 8 SEPTEMBER 1954

16

o

o

o

u.

u.w „ o 8 o

<rUJo

I I

I

I I I

30° 60' 90*

63 STATIONS

+ *

I I I

I I j I I

•K

« A

SOUTH

30* 0* 30°

X- GEOGRAPHIC LATITUDE

60* 90" NORTH

a

LONGITUDINAL CODE

345° E- 45° E

a 45° E- I05°E

7 105° E- I65°E a 165° E

- 225° E O 225° E

- 285° E

ft 285° E- 345° E
-16-

FOURIER COEFFiaENTS FOR foF2 MONTHLY MEDIANS

l 8 JUNE 1958 118 STATION

do

I 1

1 1

1 [ 1 1 1 1 1

I 1 1

1 1 —

16 —

14 —

—

u • 212 • a — V o * » o V

I- * B ° gio A o * V

U. * • . —

O 8

*

W •1

» »

's. — O * • ""•*•*

.„

UJ56 V

A f- • —

• • £* a *B ou. * r— a

• * •* •••• />

4

»

2

1 1 I 1

1 1 1 1 1 1 i 1 1 1 1 1 90' 60* 30'

l 8 DECEMBER 1958

30» 80* 90»

118 STATIONS

90° SOUTH

SO 30° 0» JO*

X= GEOGRAPHIC LATITUDE

90* NORTH

LONGITUDINAL CODE

o 345° E- 45" E

a 45" E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E © 225° E

- 285° E

tt 285° E

- 345° E
-ITFOURIER COEFFIQENTS FOR foF2 MONTHLY MEDIANS a

18 JUNE 1954 68 STATIONS

16

1 r |

I i 1 i i 1 1 | 1 1 | 1 1

14 :

u

212 —

o

o __

f.'O o

u.

u.UJ „ o 8 o

tr. UJo

4

* •

a

» •

• • * V »v » » ».

•

. • •• ,

,*

V _

2

* —

n "nil 1 1 1 1

1 1 1 1 1 1 1 1 90* 60* 30*

DECEMBER 1954

30' 60* 90*

64 STATIONS

1 1 I ' 1 1 ' '

1 1 1

1 1 1 1 1

16

-

14

*o2

~I2 o

t-5io o

u.

u. —

8

8 —

UJou. — * *

*

* A * •

ft

...

v & * *4 V

4 D

mm A s > 2

1 1 1 1 1 1 i 1

1 1 1 1 1 1 1

1

LONGITUDINAL CODE

o 345° E- 45° E

o 45° E

- I05°E

V 105° E

- I65°E & 165° E- 225° E O 225" E

- 285° E A 285° E

- 345° E

90° SOUTH

60° 30* 0* 30°

X* GEOGRAPHIC LATITUDE

60° 90* NORTH
-18-

ruURIER COEFFiaENTS FOR foF2 MONTHLY MEDIANS

B MARCH 1958 IIS STATIONS

1 1 1

1 1 1

1 1

1

1 1 1 1 1 1 _

5

e —

4 O O O

o5 3

*

•

•

*

• •

D * * «

.

A *

»-z 2 u

u.

u.

UJ .

*

* - : . : . 8

V **

* * „

• « g''

A •

» <•** o o I o

*

*

*

*

* *

ill % o oLl.

•

*

-1 —

-2 —

-3 1 1 1

1 i 1 1 1 1 i 1 1 1 1 1 90° 60° 30'

. SEPTEMBER 1958

30° 60° 90"

113 STATIONS

5 —

uj 2

o

o

LT—K

Z>O

-2

-3

I I I I

1 1 I 1 I I 1

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E- I05°E

V 105° E

- I65°E

A 165° E- 225° E o 225° E- 285° E

fc 285° E- 345° E

90° 60° SOUTH

30° 0° 30"

X* GEOGRAPHIC LATITUDE

60° 90° NORTH
-19-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 118 STATIONS

3 —

z 2 o

o I o

ccUJ§

o

-2

-3

! 1 | I 1 | 1 1

*

«

* • •

*

o %

A v * *

A

& »V ft **

—— *

1 1 | 1 1 | 1 1

*

* V

o

_ ft % a •

. * ° • v -*• •• • <^ O • A

«• • • A * O O • « « ? • — V

'" .•«•

o* * » — o *

- o » °

A *

• * ft • •

ft .11

1

1

1

1 1 1 1 1 1 1 1 90° 30°

6

5

SEPTEMBER 1958 113 ST/i TIONS

1 1 |

I 1

1

1 1

1 1 | 1 1 | 1 1

4

9 —

_- 2

• * i * A

\-z

lli 2

u.

u_UJO | o

<r

(jj %

* — v

•

ft

* •

o ft

o •

V a

• • * fl °» *• *•*.> -

° »"i."

o %$ •

ft

# oLL

A

-1

-2

-3 1 1 1 1 1

1 1 I 1 1 1 1 1 1 1

1

LONGITUDINAL CODE

o 345° E- 45° E

o 45° E

- I05"E

? 105° E- I65°E A 165° E- 225° E o 225° E- 285° E 6 285" E

- 345° E

90° SOUTH

60° 30' 0° 30°

X= GEOGRAPHIC LATITUDE

90° NORTH
-20-

FOURIER COEFFiaENTS FOR foF2 MONTHLY MEDIANS

6 MARCH 1954 66 STATIONS

5

UJu

o

o

tr. UJ

tro

3 —

2 —

-2

I I |

I I | I I

* *

- 3 L_L_L 1 1 I I

I I | I I | I I

% *.

J 1 I I I 1 I 90" 60°

SEPTEMBER 1954

30" 30° 60° 90°

63 STATIONS

5 —

uj 2

o I o

%

o

-3

I

|

I I

|

I I

I I

1 1

I I I I I I I I I I I I I 90° 60° SOUTH

30° 0° 30°

X* GEOGRAPHIC LATITUDE

60° 90° NORTH

LONGITUDINAL CODE

o 345° E- 45° E

a 45° E- I05°E V 105° E- I65°E

A 165° E- 225° E o 225° E- 285° E 6 285° E- 345° E
-21-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

6 MARCH 1954 66 STATIONS

2 3

•

xT

t-z 2 UJo

LlULll O 1 <_>

o:

UJ3O

-2

3 J_J I 1 i I I 90° 60° 30"

SEPTEMBER 1954

I I | I I

J_l L_J I I L

30° 60" 90°

63 STATIONS

5

1 1

|

1 1 | 1 1

1 1 | I 1

I

' 1

4

-

"o2 . 5

' • *

z

uj 2 o

Uu.

LxJ O | o

<TUJ3 n

1

*

d

* * ° a

".

o • —

"I

-2 —

-^ 1 1 1 1 1 1 1 1 i i i i i

1 1 1

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E o 225° E

- 285° E

ft 285° E- 345° E

90c SOUTH

60° 30" 0° 30°

X= GEOGRAPHIC LATITUDE

60" 90' NORTH
-22-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

« JUNE 1958 118 STATIONS

1 1

1 1 1 1 1

1

1 | 1 1 | 1

1

.• —

b *

4

,

A'

„ —

o

• A 2 3

* —

Dz 2 UJ

ft *

o —

o

u.

u_o 1

<r

UJ% o ou.

"~— A

* ft

* o

ft

ft A

* * * * *~ • * » * o*ft

ft* ° ft

O _ .

* w

-1

-2

-3 1 1 1 f, 1 1 1 f

1

1 1 1 1 1 1 1 90" 60°

» DECEMBER 1958

60° 90°

118 STATIONS

uj 2

UJo

cr3O

-3

1 1 11 1

[ 1 1

ft — „° *•*

• _

- fi

c ft

ii I I r I M

** *

V

*

* o

O ft ft A

ft

•

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 I

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

it 285° E

- 345° E

90° 60° SOUTH

30° 0" 30"

\= GEOGRAPHIC LATITUDE

90' NORTH
-23-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

r JUNE 1958 ll8 STATIONS

1 !

1 1 | 1 1 I 1 1 1 1

1

1 1 —

5 —

4 —

u2 3

*

_d~ o * #, . z 2 Id c O

b_

Ll. o 1 o

trUJ§ o ou.

i

«

9 „

v ft ft

o «

* ° 4° 9 °» <

« -1

,

-2 —

-5 1 1

1 1 1 1 I 1 1 1 1 1 1 1 1 90" SO 30°

DECEMBER 1958

60° 90°

118 STATIONS

5 —

uj 2

o I o

oruj§o

90° 60° SOUTH

30" 0' JO"

X= GEOGRAPHIC LATITUDE

90" NORTH

LONGITUDINAL CODE

o 345° E

- 45° E 45° E

- I05°E

V 105" E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

ft 285° E

- 345° E
-2kFOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

3 —

o I o

3o

-2

JUNE 1954 68 STATIONS

1 1 | 1 1 | II

*

*

*

1 1 | 1 1 | 1 1

o

* —

v e

*

i 1 1 J I 1 1 I

1 1 1 I 1 1 ! 1 90° 60°

DECEMBER 1954

30" 60° 90'

64 STATIONS

3

uj 2

UJO |

<ruj

' 5 o o

1 1 11 1

1

1 1

— «

* • « _ 3

* * V *

A

*

1 1 | 1 1 |

I !

o

A

*^»

o ft

• a

*

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E 6 285° E

- 345° E

90° 60° SOUTH

30° 0" 30°

X= GEOGRAPHIC LATITUDE

SO- NORTH
-25-

FOURIER COEFFiaENTS FOR foF2 MONTHLY MEDIANS

6 JUNE 1954 68 STATIONS

! 1 1 1

1 11

I

1

1 1 1 1 1 1 1 —

5 :

4 —

—

o2 3

"-Q

o a * 2 o

u.

u.o 1 o

crUJ

°i

* ^ .

'

' • \i6» o

—

3 u ou.

,

-1 —

-2

-3 "ill 1 1 1 1 I 1 1 1 1 1 J 1 i 90° 60°

6 DECEMBER 1954

5 —

30° 60° 90°

64 STATIONS

o

<r—o

-2

! I |

1 1 |1 1

* a " ». " — 7

1 1 | 1 1 | 1 I

*

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

LONGITUDINAL CODE

o 345° E

- 45° E

a 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

iS 285° E- 345° E

90" 60° SOUTH

30' 0" 30°

X= GEOGRAPHIC LATITUDE

60' 90° NORTH
2.4

2.0

-26-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 118 STATIONS ®

S 1.2

0.8

50.4 o

^0.0 o

0.4

-0.8

-12 I I I I

1

I

2.4

90" 60°

SEPTEMBER 1958

60" 90"

113 STATIONS

2.0

.6 —

1.2 o

i-z

J0.8 —

LlJ O0.4

*0.0 o

-0.4 —

-0.8

-1.2

1 1 11 1

1

1 1

ft

*

•

1 1 | II | 1 1

*

*

<> °

a A

* ^ J- » =a a —

*

*

1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E- 285° E 6 285° E- 345° E

90° SOUTH60° 30" 0° 30°

X= GEOGRAPHIC LATITUDE

60" 90° NORTH
1.6

1.2

0.8

uS 0.4

I 0.0

O-0.4

5-0.1

-27-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1956 118 STATIONS

-1.6

-2.0

I I | I I | I I

2 —

I • (-2.61)

I II

I I

I

I I

I

» • •

1.6

1.2

SEPTEMBER 1958 113 STATIONS

1 1 |

1 !

1 ' '

1 1 | 1 1 | 1 1

0.8

2

* —

0.4

CM a•

A

t-y o.o

u.

Li. UJ8-0.4

IT

A

• * A e V

O OA

*A

A **

i1—

V .*•„•• * i *

*

v

* —

3-0.8 oli.

1 A — »

«

V

'

-1.2

A / • •

,.

-1.6

« •

a

A

-?n 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 I

LONGITUDINAL CODE

o 345° E

- 45° E

a 45° E

- I05°E

V 105° E- I65°E

A 165° E

- 225° E O 225° E- 285° E

ft 285° E- 345° E

90° SOUTH

60° 50° 0* 30'

\= GEOGRAPHIC LATITUDE

90° NORTH
-28-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS Q2

2.4

2.0

.6 —

5 1.2 —

i 0.8 —

o0.4 o

orlj§0.0 o

-0.4

-0.8 —

MARCH 1954 66 STA1"IONS

1 1 | 1 1 | 1 1 1 1 | 1 1 | 1 1

—

6 ' _

' .

* * * -

•

A —

V W

a *' • *" —

1 1 1 1 1 1 1 1

1 1 l 1 1 l 1 1 1.290° 60°

24 SEPTEMBER 19 54

60° 90°

STATIONS

2.0

1 1 | I 1 |

1 1 1 1 1

1 1

1

1 1

1.6

CM

—

1- - z

ujO.8 u

Li. °

Ll. *

LlI V O04 ft o o o *°

V ^ ^

cr __ A , Ld^0 * * o */* **

Ll ' * <* o Q ft * o

-0.4

ft —

•

-0.8 1— * —

•I ?

I 1 1 1 1 1 1 1 1 1 1 1 1 1 1

1

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

y 105° E

- I65°E

A 165° E

- 225° E o 225° E

- 285° E 6 285° E

- 345° E

90° SOUTH

60° 30° 0° y

X= GEOGRAPHIC LATITI

60° 90" NORTH
-29-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1954 66 STATIONS

1.0

I

1 1 1 1 | 1 11 1 1 1 1 1 1 1

1.2

0.8

•

4 —

u2 0.4

-Q

1-z

»

A

* 4 4

•

D •> « O £ —

111 v - v o

u.

u.W nil O"0.4 o

*

•

4 4»* » * *

* « *4

4 —

UJ

~~~

3-0.8 oU1

4

4

e

-1.2 i —

-1.6 —

-2 1 1 1

1 1 1 1 1 1 1 1 1 1 1 1

1 90° 60' 30*

SEPTEMBER 1954

60* 90*

63 STATIONS

1.0

1 1

1 1

1 I ' 1

1 1 | 1

I

| 1 1

1.2 * —

0.6 4 —

2

•

- —

0.4 aH

y o.o o

Li. Li. UJ8-0.4

*

•

4 -

* 4

A

4

4

»

•

-

trUJ

(T3-0.8 ou_

~~

4

4 4 —

-1.2 —

-1 6

•

i

-? (1 1 1 I | I

1 1 1

1 1 1 1 I 1 1 1

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E- 285° E h 285° E

- 345° E

90° SOUTH

30

e 0* 30°

X= GEOGRAPHIC LATITUDE

90° NORTH
30-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS a2

2 4 JUNE 1958 118 STATIONS

1

1 1

1 1 1 1 1

1

1 1 1 1 1 1 1

2.0

- —

1.6 *

*

*

© —

oS 1.2

CM D5 0.8 o V

<fi

¥

*

v *

<>

*

V

u.§0.4

o

©

V

or§00

~~ $ °o ° © • * * © * o A V

• *8o * * • °

-0.4 ~ '

A

-0.8

-i •> "ill 1 1

1 1 1

1

1 1 1 1 1 1 1 90° 80°

2 4 DECEMBER 1958

60° 90°

118 STATIONS

90° 60 SOUTH

30° 0° 30"

X= GEOGRAPHIC LATITUDE

90° NORTH

LONGITUDINAL CODE

345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E & 285° E- 345° E
-31-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1958 H8 STATIONS

1.2

2 0.4

pj

| 0.1 v

3-0.4 o

QEUJE

-1.6

-2.0

I»(-2.I9)

J l_J L_L

i. «t .

i I I I I I 1

1.6 DECEMBER 1958 118 STATIONS

1 1 [ 1 I 1 1 I 1 I 1 | 1 |t.| |

I I 1 '3

a

*t

1.2 4

0.8

• • "o • 4 2 *.

0.4 • # a

• * .•

t- i "*• y 0.0

••

• * • o a -9 • % * • " a.

u.

•

. v

o *

UJ «. • * g-0.4 •

cc — UJ A » • a • (T > 3-0.8 « O # u. • V 1 ~~"

-1.2

•

Q

» t

. « *• »

-1.6 1 * (-2.56) 1 2 • 2 (-2.09) —

1 1 3 ' (1.69) —

-?n 1 1 1 1 1 1 1 1

1 1 1 1 1 1 I 1 90° 60° SOUTH

30* 0* • 30*

X= GEOGRAPHIC LATITUDE

90" NORTH

LONGITUDINAL CODE

o 345° E

- 45° E 45° E

- I05°E

V 105° E- I65°E

A 165° E

- 225° E O 225° E

- 285° E

it 285° E- 345° E
-32-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

2 .4 , JUNE 1954 68 STATIONS

2.0

1.6

S 1.2

•

C\J D

t~go.a o

u_

u.#0.4 o

crUJ§0.0

o

0.4

-0.8

"

I. 2

l I I

1 1 90' 60°

2.4 DECEMBER 1954

60* 90'

64 STATIONS

2.0

1.2

ujO.8

O0.4

tO.O

0.4

-0.8

-1.290" 60" SOUTH

30° 0° 30°

\= GEOGRAPHIC LATITUDE

60" 90° NORTH

Q2

LONGITUDINAL CODE

345° E

- 45C E

a 45° E- IC5°E

V 105° E

- 165° E A 165° E

- 225° E O 225° E- 285° E

ft 285° E- 345° E
1.6

-33-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1954 68 STATIONS

2 0.

0.0

8-0.. o

<rUJ

a: «

-2.0l J 1 1 I L

I I I I

\ *

J L_J I I I L

»° 60° 30° 30°

DECEMBER 1954 64 STATIONS

1.2

0.8

1 I |1 1 |1 1 1 1 | 1 1

1 1 1 _

-

2

0.4 *

ft

ft

.Q

1-w 0.0 u

u.

u.UJ8-0.4

»

•

ft

• *

• _

o » » »

• -

tr. UlI-u.

— *

•

*

o

V —

-1.2

-1.6

-?0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

& 165° E

- 225° E © 225° E

- 285° E

ii 285° E - 345° E

90" 60" SOUTH30* 0° 30"

X= GEOGRAPHIC LATITUOE

90" NORTH
-3*-

2.0

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 118 STATIONS

1.2

S0.8

0.4

So.o o

tr

us§0.4

o

-0.8 —

1 1

1 1 1 1

1 1 1 1 | 1 I

| 1 1

o v

*

*

1 1 1 1 1 1 1 1

o «

. * - .V. _

V • ~

I 1 1 1 1 1 1 1

-1.2

-1.6 90° 60° 30

2.Q SEPTEMBER 1958

30° 60" 90*

113 STATIONS

1 1 1

1 1 1

1

1 1 1 | I 1 | 1 1 —

1.6 '

1.2 —

"o — —

2

-0.8 O

1-uj0.4 —

u *

Ix. o *

Ll. « v - LUoOO • • ,°l , a o * •

•

LU

4 ' V

" a • ^0.4 » • o • W O

Li. —" * * * » "" -

-0.8

A

9 • V , _ *

» -1.2 """'

*

-l.fi 1 1 1 1 1 1 1

1 1 1 1 1 I 1 1

IONGITUDINALCODE

o 345° E

- 45° E

a 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E o 225° E

- 285° E 6 285° E

- 345° E

90° SOUTH60° 30" 0° 30°

\= GEOGRAPHIC LATITUDE

60° 90" NORTH
-35-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 118 STATIONS

1 1 | 1 1 | 1 1 1 1 | 1 1 | 1 1

1.2 —

0.8

— —

—

<_>• 2 0.4 6°

to .o

1- " -'. * z 00

•

* * »• • • •

u.

Ll. • *

•

* • . •• .:

•

O-0.4

o » • ° O • * ' » *V • \ *

• , • , * cr * *

# V « g — UJ5-0.8 *

» „. o * u. — •

-1.2 —

-1.6 —

-2 1 1 1

1 1 1 1 1 1 1 1 1 1 1 1 30° 60° 90*

SEPTEMBER 1958 113 STATIONS

lb

1.2

1 .1 '

1 1

1 1

1 1 | 1 1 | 1. 1 _

0.8 —

2

0.4 _Q

1-y 0.0 y

Ll. U.

UJ8-0.4

UJI-u.

a

« • " . 7

a a #

•a

a * *

a

* *

•

«

•

•

% • * * • 4 •• ' ' •

• •.•.••;• — •2 . „ t *

. « o W « * •«

-1.2

-l.fi

—

-?0 1 1 1 1 1

1 1 1

1 1 1 1 1 1 1 1

LONGITUDINAL CODE

o 345° E- 45° E 45° E

- I05°E

7 105° E- I65°E

A 165° E

- 225° E o 225° E- 285° E 6 285° E- 345° E

90° 60" SOUTH

30° 0" 30°

X= GEOGRAPHIC LATITUDE

90" NORTH
-36-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

2.0 MARCH l< 354 66 STATIONS

I I

| 1 1 | 1 1 1 1 | 1 1 | I 1

1.6 —

1.2 -

u

30.8 ^___

Oz 04 UJ "" o

u.&o.o o

trUJ§0.4

oU.

*

* * • 2 *

* o

o

•0

-0.8

o V —

-1.2 —

-l.fi 1 I 1 1 1 1 1 1 1 1 1 1 1 1 ! 1 90° 60" 30

2.0 SEPTEMBER 1954

30° 60° 90*

63 STATIONS

1 1 | 1 1 | 1 1 1 !

1

1 1 11 i

1.6 —

1.2 —

2

-0.8

to

t-5 0.4 o

liil. UJnnn *

—

o

<rUJ§0'.4 ou.

^ S \

1— o

^* <> » •

? —

-0.8 ^_

«

-1.2 —

-Ifi 1 1 1 1 1 1 1 1

1 1 i 90° 60° SOUTH

30" 0° 30°

X* GEOGRAPHIC LATITUDE

60° 90" NORTH

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V !05° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

is 285° E

- 345° E
-37-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

1 g MARCH 1954 66 STATIONS

1.2

1 1 | 1 1 J

1 1 1 I | 1 1

I

1 1

0.8

u5 0.4

ro 7 z oo

7 *. 7 • « UJ wu o

u.

§-0.4 o

ccUJ

— * • o

a

*

4 - *

• * « •• * —

o • • >

• • *

£-0.8 ou.

-1.2 —

o •

-1.6 l —

-?(1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 60" 90*

1 fi. SEPTEMBER 1954 63 STATIONS

1 1 ] 1 1 | 1 1 J 1 M M M

1.2 —

o.a —

z

0.4 —

_

ro

w 0.0

u.

Ll. UJg-0.4

A 9

a A

ft q

• UJ • 3-0.8 ou.

-1.2

—

-1.6 —

-2 1 1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 90" SOUTH

30° 0° 30»

X= GEOGRAPHIC LATITUDE

60' 90* NORTH

LONGITUDINAL CODE

o 345° E

- 45° E

o 45° E- I05°E

V 105" E

- I65°E A 165° E- 225° E o 225° E- 285° E a 285° E- 345° E
-38-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

2.0

1.6

1.2

JU NE ' 959

50.8 —

£0.4

go.o o

§0.4 o

-0.8

-1.2

-1.6

Pf 118 STATIONS

I

I I

I

I I

I o (-1.67) J I I I L J L

*<»

1_J 1 1

I 1I I 30° 60" 90*

?.o DECEMBER 19 58 118 STATIONS c

f

'

'

1 1 | 1 1

' ' 1

1 1 | 1 1

1.6

1—

'

1.2

° 2

-0.8 * « .— O • 5 0.4 o

u_

Li.

LLl oOO * „ '

t —

•;. * . -

* » ° e " o

cr

^0.4

u.

-0.8

4 » * 4 ^ * ° *

» *

•

•° *

* V -

-1.2 *

* —

-Ifi 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 90° 60° SOUTH

30" 0° 30°

X- GEOGRAPHIC LATITUDE

80° 90° NORTH

O3

LONGITUDINAL CODE

345° E

- 45° E

45° E- I05°E

V 105° E- I65°E

A 165° E

- 225° E O 225° E- 285° E

ii 285° E- 345° E
-39-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1958 118 STATIONS

1.2

0.8

0.4

0.0 o

llW HA o

a.y

-1.2 —

-1.6

-2.0

I I |

I I |

I I

V V 9

I

I I

I

I

I I

» o „ »*• A o »

» aw «• "P e «

90' 60° 30°

l.6r DECEMBER 1958

60° 90*

118 STATIONS

1.2

0.8

to

0.4 r

y o.o

LlI g-0.4

i-°

-1.2

-1.6

-2.0

1 I |I—I—

|—TT I

I I I

A

90° SOUTH

60° 30° 0° 30°

X= GEOGRAPHIC LATITUDE

60° 90' NORTH

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E- I05°E

V 105° E- I65°E

A 165° E

- 225° E O 225° E- 285° E

tl 285° E

- 345° E
-1*0-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

2 JUNE 1954 68 STATIONS

1.6

1 1 | 1 1 | 1 1 1 1 | 1 1 1 1 1

1.2

u

20.8 O

£.°-4 o

LlSno * o » *

v

trUJ§0.4

oLl

* ° *

• s

o

D V

-0.8

-1.2 -

-I fi 1 1 1 1 1 1 1 1 —

1 1 l 1 1 l 1 1 90° 60' 30°

20 DECEMBER 1954 64 STATIONS _ 1 1 | 1 1 | 1 1 i i 1 i i

1 ' ' _

1.6 —

1.2 —

2

-0.8 —

ro

5 0.4 (J

Ll

Ll.

Ll) OOO

a • *

« —

O

tr

UJ§0.4

oLl

A 4> * • —

-0.8 —

-1.2 —

-IB 1 1 1 1 Mil 1 1 1 1 1

1 1 1

LONGITUDINAL CODE

o 345° E- 45° E

a 45° E- I05°E

V 105° E

- I65°E

A 165° E

- 225° E o 225° E.- 285° E

ft 285° E- 345° E

90' 60* SOUTH

30« 0* 30°

X= GEOGRAPHIC LATITUDE

®° NORTH
-inFOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1954 68 STATIONS

1.2

0.8 —

2 0.4

zoo o

u.§0.4 o

«r

a.

-2.0

•

~ 1

1

.1

.1

1

1 1 | 1 1 | 1 1

V 9 * V

•

«

1 f 1 1 1 1 1 1

9 • * _

• •

• o

1 1 1 1 i 1 1 1

o.» —

-1.2 —

1.6

90s 86° 30*

DECEMBER 1954

30*

1.2 —

0.8 —

0.4 —

z

ui 0.0 y

u.

u.

UJg- 0.4

UJ

5-0.8 O

-2.0

-1.2 —

1.6 —

rrr

60« 90*

64 STATIONS

f \

I I

1 I

1 I I I

LONGITUDINAL CODE

o 345° E- 45° E

45° E- I05°E

7 105° E- I65°E

A 165° E- 225° E O 225° E- 285° E

tl 285° E- 345° E

90° SOUTH

60° 30° 0* 30*

X- GEOGRAPHIC LATITUOE

60

e 90* NORTH
0.8

0.6

0.4

£0.2

i 0.0

Q-0.2

a.£0.4

-0.8

-0.8

42-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 118 STATIONS

a4

-i.c

0.8

0.6

0.4

o

t-y o.o

I I I I I I

I I

I I I I

I J I

' O V

• • TO

i . * » 8 » .1 +

i_l 1 I I I L_J_

60°

SEPTEMBER 1958

30'

UJ

-l.(

i r~| i i | r~r

60° 90*

113 STATIONS

-0.4

0.6

- —

-0.8

» •- •

o*

LONGITUDINAL CODE

o 345° E- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E- 285° E

S3 285° E

- 345° E

SOUTH

30° 0* 30*

X- GEOGRAPHIC LATITUOE

a* »• NORTH
-h3-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 118 STATIONS

I.U

0.8

1 1 1

1 1 | 1 1 1 1 | 1 1 | 1 1

0.6 v Q o2 0.4

• • * «

«

5o.z

c_> u.HioO.O o

i— *

>

* o •

° »

*"!«" ° : .

*

y

UJ30.2 o

*

• m

-0.4

-0.6

-n° 1 I 1 . 1 1 1 1 1

1 1 1 1 1 1 1 1

0.8

0.6

f 0.4

w 0.2

UJ8 o-<

or

90" 60° 30'

SEPTEMBER 1958

30' 60* 90°

113 STATIONS

02

-0.4

-0.6 Mill 1

#»* . •

I I I I I

1 L_L

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E- I05°E

V 105° E- I65°E

A 165° E

- 225° E o 225° E

- 285° E

ft 285° E- 345° E

90° 60° SOUTH30° 0" 30°

X= GEOGRAPHIC LATITUDE

60° 90° NORTH
-kkFOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1954 66 STATIONS

0.8

1 1 | 1 1 | 1 1 1 1 | 1 1 ] f J

0.6 —

0.4 — —

u —

*0.2 D

tjo

• A • uj 0.0 o

u.

*

* u

UJ8-0.2

V

D i

orUJ « -

£0.4

u.

-0.6

-0.8 —

—

1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 '•°» 60° 30" 30*

0.8

0.6

0.4

SEPTEMBER 1954

60* 90*

63 STATIONS

y 0.0

ITUJ

5-0.4 o

-0.6

-0.8

I I I I ) | I I | I I

I I I 1 I I I 1 60° SOUTH

30

c 0» 30°

X- GEOGRAPHIC LATITUOE

90" NORTH

a4

LONGITUDINAL CODE

o 345° E- 45° E

45° E- I05°E

\7 105° E- I65°E

A 165" E- 225° E o 225° E

- 285° E

ft 285° E- 345° E
-h5-

i.o

0.8

0.6

04

0.2

oO.O o

o

-0.4

-6.6

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1954 66 STATIONS

J 1 I I I 1 1 I J_J L_J till

V CO* 30*

SEPTEM&ER »954

Jf «e* w

63 STATIONS

1.0

1 1 | 1 1 | 1 1 1 1 | 1 1

1 ' l

0.8

0.6 —

*o „ —

2 " V »0.4

• O

l- * v z

uj 0?

*» »

0»

o u • V° 1 •• u. %

" 5 V

• u. <? °^ UJ

* A * 6 8 oo

y • * *,

<r

UI

(T

o a " =>-n? ou. —

-0.4

-0.6

-08 I 1 1 1 1 1 1 1 1 1 1 1 1

l 1 1 90° 60° SOUTH

30° 0° 30*

X= GEOGRAPHIC LATITUOE

60* 90' NORTH

1 ON«ITUDhNAL CODE

o 345° E

- 49°E

O 45° E

- 105" E V 105° E

- I65°E

a l«5°E - 225° E o 225" E

- 295° E

tt 285° E

- 345° E
-U6-

0.8

0.6

0.4

5 0.2 o

ujO.O

UJ8-0.2

£0.4

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1958 118 STATIONS

a4

-0.6

-0.8

I I

|

I I

I

I I

I F I |

I I

| I J

,-. l 1 1

O O o ^ a

*<,-.'. •/

J h J I L

0.6

0.6

0.4

8 60° 30*

DECEMBER 1958

60° 90*

118 STATIONS

0.2 oy oo

i o

a:

3-0.4 o

-0.8

-0.8

SOUTH

I I I I I

1

I I I I I I

I M | ! I

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

| & 165° E

- 225° E « 225° E

- 285° E

ft 285° E- 345° E

* •% * .

M" 0° 30°

X- GEOGRAPHIC LATITUOE

60° 90' NORTH
-hiFOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

1.0 JUNE 1958 118 STATIONS

1 1 1 ! 1 | 1 I 1 1 | 1 I | 1 1 —

0.8 —

-

0.6

A

u5 0.4

H

g0.2 u

u.

h.

LLi oO.O o

OCUJ

£C=>0.2 ou.

-0.4

* o°

,G* *

*

* • . . * •

*

—

-0.6

1 1 1 1 1 1 1 1 1 l 1 l I 1 I l 90° 60"

„ DECEMBER 1958

30' 60* 90°

118 STATIONS

8

6

0.4

y 0.2

ccUJ

-0.2

-0.4

-06

—

1 ' 1

1 J

1 1 1

1 1 11 1 1 _ —

» — — —

•a

1 O

© — *

c

* - — A

• *

• V

o „

«

„•» w """o o » .a 5 9

t * — A • *; ' ° -„• *^

°. * W ~

—

*

..•': — —

—

1 1 1 1 1 1 1

1 1 i .i i in -i T

90° 60' SOUTH

BO* 90° NORTH

b4

LONGITUDINAL CODE

o 345° E

- 45° E

45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E o 225° E

- 285° E

ft 285° E

- 345° E

\= GEOGRAPHIC LATITUDE
-USFOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1954 68 STATIONS

0.6

1 1 I

I 1 [

1 1 1 1 I

1 1 1 1 J —

0.6 —

* 0.4

• • « _ * u « 5 0.2

*

*

* ^D ^ • —

»- •

•

A

ujQ.O •» * «# " • ^ • —

u * "*. >•*

u. V « v A

b. */ • UJ8-0.2

«

a. # - * • UJ * K

2-0.* ou. -

-o.e —

-0.8 —

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 -u&

0.8

eo«

DECEMBER 1954

30* 60* 90*

64 STATIONS

0.6

0.4

o

»-^ 0.

UJ

-0J

-0.1

I I I I | ! I | I I

V

I I

• I I I 1 I I

SOUTH

30° # 30*

X- GEOGRAPHIC LATITUDE

80* 90* NORTH

a4

LONGITUDINAL CODE

o 345° E-- 45° E

a 45° E

-

- 105° E

V 105° E

- 165° E

a 165° E

- 225" E o 225° E

- 285° E

ft 285° E

- 345° E
-U9-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

0.8

0.6

S0.4 —

i0.2 —

OO.O o

ir —

§0.2

o

-0.4

-0.6

-0.8 L

JUNE 1954

1 1

1 1 | 1 1 i i

i

i

i rrr

— • — • «» —

*

.*

A

«

•J ** m *

•

—

*

V

A

* *

*

< • • ••

6

1 1 1 1 1 1 1 1

1 1 l 1 1 l 1 1 »• 90°

1.0 DECEMBER 1954 64 STATIONS

1 1 - 1 1 1 1 1 1 II 1 1 1 1 1 1

i I 1 1

0.8 —

— -

0.6

2

*0.4 jQ

1-Z

y 0.2 o

u.

LL. 8 o.o

trId

ccg-0.2

LL.

— • • v

«

•

o V #

B 7."

—

-^

-0.4 —

— -

-0.6 — —

-

-08 1 1 1 1 1 1 1 1 1 1 1 1 1 1

1 1

LONGITUDINAL CODE

o 345° E

- 45° E

o 45° E

- IC5-E

V 105° E- I65°E

A 165° E- 225° E o 225° E- 285° E

ft 285° E

- 345° E

90" 60° SOUTH

30" 0° 30"

X- GEOGRAPHIC LATITUDE

60

e 90* NORTH
-50-

0.8

0.6

0.4

*0.2

0.0

O-0.2 o

<ryjO-0.4

-0.6

-0.8 —

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH J958 118 STATIONS

a5

XRCH 1958

I I I I

I I L_L

o:s

0.8

0.4

0.2

0* SO* 30°

SEPTEMBER 1958

30°

in o

y 0.0

S-0.2(-

a.

^•0.4 o

-0.6

-0.8

-1.0

I I |

I *! | I I

60° 90*

113 STATIONS

I I | 1 I

1* * •

• # D

I 1 I I I I I

LONGITUDINAL CODE

o 345° E

- 45" E

D 45° E

- I05°E

V 105° E

- I65°E

a 165° E- 225" E o 225° E

- 285° E

fc 285° E- 345° E

90° 60* SOUTH

30* 0* 30'

X* GEOGRAPHIC LATITUDE

«r 90' NORTH
-51-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 118 STATIONS

1.0

0.8

I I

1 I 1 | 1 1 1 1 | 1 I | 1 1

0.6

uJ 0.4 m

_Q

1-S0.2

<_> u.

u.8 0.0 o

«rkJ

!>0.2 oIL.

_ * A

*

*

*

'

•

V

• •

* *

• •

w

. • •

• *^ • • «

* • * * * * .

*

*

o 4

*

v . ******

-0.4

-0.6

-an 1 I 1 1 1 1 1 1 1

1 1 1 1 k 1 1 1

i.O

0.

0.6

60°

SEPTEMBER 1958

30°

0.4

iU 0.2 y

i.

£

•0.2

-0.4

-0.6

-0.8

I I | I I |! I

60' 90*

113 STATIONS

I I I I I I

•*».

LONGITUDINAL CODE

o 345° E

- 45° E

a 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E- 285° E

ii 285° E

- 345° E

908 SOUTH

60' »' 0' 30*

X- GEOGRAPHIC LATITUOE

60* 90' NORTH
-52-

0.8

0.6

0.4

u5 0.2

ir o

t-ie.o a

u.

u.h

-o.e

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1954 66 STATIONS

a5

-e.&

-e ,

I I I I I I LJL

0.8

0.6

0.4

F SO* 30*

SEPTEMBER 1954

I J 1 1 1 I I I 36*

«3 STATIONS

\a 0.0

a:UJ

<E

0.4

-0.6

-0.8

I I | I I | I I

j_l.

'. * #•' *•»*

LONGITUD+NAL CODE

e 345° E

- 46*E

a 45° E- I05°E

V 105° E- I65°E

A 165° E- 225° E o 225° E- 285° E

<r 285° E- 345° E

60° SOUTH

30° 0' 30°

X* GEOGRAPHIC LATITUDE

60' 90° NORTH
-53-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1954 66 STATIONS

1.0

1 1 I 1

1 | ! 1 1 1 | 1 1 | 1 1 —

0.8

0.6

uS 0.4 —

m 9

1-S0.2 o

u.

u.UJOO.O o

•

•

*

m —

* * *

a.UJ30.2 ou.

*

• —

-0.4 —

-0.6 —

-OR 1 1 I 1 1 1 1 1 1 1 1 1 1 1 1 1 30*

SEPTEMBER 1954

•°| ! I |

I I |I I

0.6

,0.4

y 0.2

UJ8 o.o

or

UJ

-0.2

-0.4

-0.6

-0.8

30' 60* 90*

63 STATIONS

I

1 1

I I I I I

•-•* -*

:•»

LONGITUDINAL CODE

o 345° E- 45° E

o 45° E- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E- 285° E

ft 285° E- 345° E

90° SOUTH60° 30° 0* 30*

X- GEOGRAPHIC LATITUDE

60* 90* NORTH
-5^-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

.JUNE 1958 118 STATIONS

1

1 1

1 1 | 1 1 1 1 | ! I

| 1 1

0.6 —

0.4

u2 0.2

6

* °

g-0.0 u

S-0.2 o

6

o a « = « *

. . " » 1

A *

W

* » V

*

• • —

•

or

Ll) §0.4

oLl. —

-0.6 —

-0.8 —

-i n "ill 1 1 1 1 1

i i i i i i i i

0.8

0.6

0.4

0.2

w 0.0 o

8-0 2

tr

LU

90* 60° 30°

DECEMBER 1958

60* 90*

118 STATIONS

-0.4.

-0.6

-0.8

-I.0L

+> .

•• . •: •

• ••* •

I I 1 I I I 90° SOUTH

60 ' 30° 0' 30°

X= GEOGRAPHIC LATITUDE

80' SO- NORTH

a5

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

A 165° E- 225° E O 225° E

- 285° E 6 285° E

- 345° E
-55-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1958 118 STATIONS

0.8

0.6

0.4

£0.2 o

8 0.0 o

3-0.2 O

-0.4

-0.6

-0.8 I I I I I I i I

— +*>

4 * ' V

..V- -

_L_J 1 I 1 1

I 1 eo° 30°

DECEMBER 1958

60* 90*

118 STATIONS

1.0

1 1 M.i 1i i

1 1 1 I'M 1

0.8

0.6 —

2

* » • —

*0.4

X3 * .• •

^0.2

u.u.

UJ8 o.o

ccUJor3-0.2

u.

i • .

•

*

• * * -

• .

V* ' • - *

V * * •

*

•

* la

°. »

o -0.4 *

• —

* -

-0.6 '

-OR 1 1 1 1 1 1 1 1

1 1 1

1

1 1 1 1

LONGITUDINAL CODE

o 345° E

- 45° E

a 45° E

- I05°E

V 105° E

- I65"E

a 165° E

- 225° E o 225° E

- 285° E 6 285° E

- 345° E

90° 60° SOUTH

30° 0* 30*

X- GEOGRAPHIC LATITUDE

60' 90* NORTH
56-

0.8

0.6

0.4

5 0.2

uj 0.0

bJ3-o.z

UJ

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1954 68 STATIONS

^0.4

-0.6

-0.8

'« J L_J I L_i L

\ . i-t *

4" -> .

J L_J I I I L

60°

0.8 DECEMBER 1954

30« 60" 90*

64 STATIONS

0.6

0.4

y 00'

orUJ

5-0.4 o

-0.6

-0.8

-I.I 60° SOUTH

30° 0* 30*

X* GEOGRAPHIC LATITUDE

60* 90* NORTH

a5

LONGITUDINAL COOE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

& 165° E

- 225° E o 225° E- 285° E o 285° E - 345° E
-57-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1954 68 STATIONS

1.0

1 1

1 1

1

1

1 1

1 I

1 1 1 1

1 I

0.8 —

0.6 —

o* 0.4 m —

i-g0.2 u

ta. u.8 0.0 o

a.u

30.2 o

b.

-0.4

• *

• —

• *

• /• —

-0.6 —

-n* 1 1 1 1 1 1 1 I

i i 1 i i 1 i

i 30*

DECEMBER 1954

30» 60° 90*

64 STATIONS

0.8

lO

0.6 —

0.4

^ 0.2 o

tu

-0.2

-04

-06

-0.8

I I | I I |

I I

-»*- * »».

r~rn—i i

| i i

% * .•

90' SOUTH

60° 30° 0* 30°

X* GEOGRAPHIC LATITUDE

90* NORTH

LONGITUDINAL CODE

o 345° E- 45° E 45° E- I05°E

V 105° E

- I65°E A 165° E

- 225° E 225" E

- 285° E a 285° E- 345° E
-58-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS a6

0.8

0.6

0.4

5 0.2 o

0.0

Q-0.2

IXUJ

cr

-0.6

-0.8

-«4r

MARCH 1958 118 STATIONS

1 1 | 1 1 | 1 1 1 1 | 1 1 | 1 1 "

- -

• * •

— • V •

A

•

1 1 l 1 1 l 1 1

1 1 I 1 1 1 1 1

0.8

0.6

0.4

SEPTEMBER 1958

z

y 00 o

UJ

-0.8

I I | I I [

I I

60* 90*

113 STATIONS

-0.4

0.6 —

I I I

1

I I I I

i . * . S * .»—

J «o «

I I

1

I I I I

1 60' SOUTH

30* 0* 30°

X* GEOGRAPHIC LATITUOE

90' NORTH

LONGITUDINAL CODE

o 345° E

- 45° E

a 45° E- I05°E

y 105° E

- I65°E

& 165" E

- 225° E O 225" E

- 285° E

ft 285° E- 345° E
-59-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

1.0 MARCH 1958 118 STATIONS

1 1 f1 l|li 1 1 | 1 1 | 1 1

0.8 —

06 —

u

""

*0.4 — —

10 • K • £0.2 o

b.

§o.o o

<rUJ*0.2 Ob.

-0.4

• J* . .

*

•

•

• *

a * *

o *

t,

-0.6 —

-n» 1 I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 SO* 60° 30*

SEPTEMBER 1958

30* 60* 90*

1.0

0.8

0.6

0.4 —

113 STATIONS

!i!0.2 o

8oo

IT

UJ

-02

-0.4

-0.6

-0.8

1 1 11 1

1

1 1

A

•

* *

*

1 1 | 1 1 | 1 1

•

• * —

*

a ~~" V • * *A *

* V -

1 *

*

* * . *

A

•

1 1 1 1 1 1 1 1

• • ; • - •

•

i i i i i i i i 908 60* SOUTH

30* 0* 30*

X* GEOGRAPHIC LATITUOE

90' NORTH

LONGITUDINAL CODE

o 345° E- 45° E

O 45° E- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225" E- 285° E

ft 285° E- 345° E
-6o0.8

0.6

0.4

5 0.2

ID a

ujO.O u

g-0.2

trUJ

QC2-0.4

-0.6

-0.8

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1954 66 STATIONS

w»

1 1

1 1 11 1

1

1 1 1 1 1 1 1

1 —

- -

—

6 —

- —

a • • .

"

.• •"•'.«,

*

• —

1 1 t I 1 1 1 1 ! 1 1 1 I I 1 1 60° 30°

0.8 SEPTEMBER 1954

60* 90*

63 STATIONS

0.6

0.4

S 0.0

UJ8-c

UJ

-0.4

-0.6 —

-0.8

I I |

I I I I

I I I I I

1

I I

1

I I

1

I I I I I 60° SOUTH

30° 0' 30*

X* GEOGRAPHIC LATITUOE

90' NORTH

a6

LONGITUDINAL CODE

o 345° E

- 45° E

a 45° E

- I05°E

v 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E 6 285° E

- 345° E
61-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1954 66 STATIONS

1.0

'

1 1 |

I 1 | 1 1 1 1 |

1 1 | 1 1

0.8 , —

0.6 , —

u

S0.4

ID

1-S0.2

<j

ii_ u.

iLl oO.O o

a.yj*0.2 oIt.

r

• ,* • *«

—

• •

• — •

•

• • —

-0.4

-0.6

-at i i 1 i i 1 i i

i i 1 i i 1 i i

1.0

0.8

0.6

90° 60° 30°

SEPTEMBER 1954

30* 60* 90*

63 STATIONS

04

y o.i o

8oo

—

-0 2

-0.4 —

-0.6

-0.8

I I | I I | I I I I I | I

I | I I

• V • *

A

* ^ # • • * 5—;—* » —

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E- I65°E

A 165° E

- 225° E O 225° E

- 285° E b 285° E- 345° E

90° SOUTH

60° 30" 0* 30'

X- GEOGRAPHIC LATITUDE

60* 90' NORTH
-62-

0.8

0.6

0.4

£0.2 o

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1958 118 STATIONS

0.0

8-0.2

crUJ

cr£0.4

-0.6

-0.8

'^ 1

I 1i I:

1

I I |

I I | I I

V • «*

1 I 1 I 1 I 60'

0.8 DECEMBER 1958

60* 90*

118 STATIONS

0.6

0.4

2a 0.1

(_r

crUJ

0.4

-0.6

-0.8

1 I I I I 1 I I

I I | I I

|

I I

I I I I I

1

I

1

SOUTH

30* 0' 30*

X* GEOGRAPHIC LATITUDE

90* NORTH

a6

LONGITUDINAL CODE

o 345° E

- 45° E 45° E

- I05°E

7 105° E- I65°E

A 165° E

- 225° E O 225° E- 285° E & 265° E

- 345° E
-63-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1958 "8 STATIONS

0.8

0.6

u

S0.4

to

t-S0.2

8 0.0 o

5-0.2 o

-0.4

-0.6

-0.8 J l_J I I I I I

I I | I

I

| I I

/ • —

*-**&*•.

30'

1.0 DECEMBER 1958 118 STATIONS

1 1 1 1 | 1 1

1 1 1

1 1 | 1 1 —

0.8 —

0.6 —

2

0.4 -»

I-^0.2 o

tL. h.

UJ8o.o

q:

2-0.2 o

_ ^

A

•

*

* *• •

A

«

* a

•

; . • —

4 '. . " .» \J - - *•:.« * •

A

» •

e

«

c . *

* —

-0.4

« —

-0.6

-0* "

1 1

1 1 1 1 1 1 1 1

1 1 1 1 1

LONGITUDINAL CODE

o 345° E- 45° E

D 45° E- I05°E

V 105° E- I65°E

A 165° E

- 225° E O 225° E- 285° E 6 285° E- 345° E

90° SOUTH60° 30' 0* 30*

X= GEOGRAPHIC LATITUDE

90* NORTH
-6kFOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNF |QfS4 68 STATIONS

0.8

1 1 | 1 1 | 1 1 1 1 | 1 1 | I !

0.6 —

-

0.4 —

u —

5 0.2

(0 o

t- *

•

uj 0.0 u

u.u.

UJQ-0.2

*

*

» —

*

ITUJ

£tg-0.4

u. —

-0.6 —

-0.8 — III! lilt 1 1 1 1 1 1 1 1 '%

0.8

60°

DECEMBER 1954

30' 30' 60" 90*

64 STATIONS

0.6

0.4

^o.ot

LlI 8-0.2

<ruj

IT 0.4

-0.6

-0.8

-l.(

» " <r

I I I I

I I

| I 1 [ I !

I I l I

1 I l 60° SOUTH

30" 0* 30*

X* GEOGRAPHIC LATITUDE

90* NORTH

a6

LONGITUDINAL CODF

o 345° E

-

- 45" E

D 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E o 225° E

- 285° E h 285° E

- 345° E
-65-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1954 68 STATIONS

0.8

0.6

u

S0.4 S

t-y0.2h o

8 0.0 o

!>0.2 p

-0.4

-0.6

-0.8 I 1 I 1 I 1 1 I

X

a • v

±_l l_J I I L_L

90° eo°

DECEMBER 1954

30'

1.0

0.8 —

30* 60# 90*

64 STATIONS

0.6

,0.4 —

0.2 —

Ll_ LlJ

-0.6

-0.8

1 1 1

1 1 I1 1

— o

a

1 1 | 1 1 |1 1

• ___

D

• » £ —

• * — •

*

«

1 1 1 1 1 1 1 1

» .» » .

1 1 l 1 1 l 1 1

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E- I65°E

A 165° E

- 225° E O 225° E

- 285° E b 285° E- 345° E

-0.2 —

-0.4 —

90" SOUTH

60° 30° 0* 30*

X- GEOGRAPHIC LATITUOE

90* NORTH
-66-

0.4

0.2

3 0.

go.

8-oj o

UJ5-0.2 o

-o.;

-o.<

-o.*

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 118 STATIONS

a7

4ARCH 1958

I I I I I I 1 I

I I | I I | I I

• •» »:»

«9 %\

_L_I l_l I I I L

»• 60° 30*

SEPTEMBER 1958

0.4

0.3

0.2

0.1 —

60* 90*

113 STATIONS

^ 0.0 o

8-0.1

0.2

-0.3

-0.<

^.

I I | I I | I I

* V * •

* «

LONGITUDINAL COOE

345° E

- 45° E

D 45° E- I05°E

V 105° E- I65°E

A 165° E

- 225° E O 225° E- 285° E 6 285° E- 345° E

60° SOUTH

30» 0" 30*

X« GEOGRAPHIC LATITUOE

»• 90* NORTH
-67-

0.4

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 "8 STATIONS

b7

0.2

2 0.1

| 0.0 o

o-O.I o

or — UJ5-0.2 o

0.3 —

-0.4

-0.5

I I | I I | I I

• . * t o

«• * O *

J I L_J I I L

60' 90*

0.4 SEPTEMB ER 1958 113 STATIONS

1 1

1 1 1 1

' ' 1 1 | II J

1 1

0.3 ' —

0.2 > •

2

1 *

A

*

9

• • • D

1-y o.o o

u.u

UJ8-0.1

a.

UJ

— • *

#

A

• i

—— A

* •

* • *

*

^0.2 ou. •

-0.3 • —

-0.4 —

-ft «; l l 1 1 1 1 1 1

1 1 1 1 1 1 1 1

LONGITUDINAL CODE

o 345° E- 45° E

45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

ft 285° E

- 345° E

90° SOUTH

60 c 30° 0* 30*

X- GEOGRAPHIC LATITUDE

60' 90* NORTH
68-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

04 MARCH 1954 66 STATIOI

Or

0.2

0.0

o-0.^—

o

5-0-21

o

-0.5

I I | I I | I I

1 1 1 I I I I

I I | I I | I I

• »

"#

0.4

0.3

0.2

0.1

^0.0

o

g-o.i

—

£0.2

o

-0.3

-0/

90" 60° 30°

SEPTEMBER 1954

30*

I I [ I I | I I

60* 90*

63 STATIONS

'90

1 I I I I I I I

V A * *

LONGITUDINAL CODE

345° E

- 45° E

45° E

- I05°E

7 105° E

- I65°E

A 165° E- 225° E O 225° E- 285° E

is 285° E- 345° E

SOUTH

30° 0* 30*

X« GEOGRAPHIC LATITUOE

80' 90* NORTH
-69

-

0.4

0.2

* 0J

0.0

g-0.1 o

trUJ§-0.2 o

-0.

-0.4

-0.5

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1954 66 STATIONS

b7

I I | I I | I I

0.4

0.3

0.2

0.1

90* 60* 30*

SEPTEMBER 1954

30*

y 0.0 o

S-o'l—

5-0.2 o

-0.3

-0.4

-0.5

I I

I

I

' I'

60* 90*

63 STATIONS

I I | I I | I I

» •»

* * ,

LONGITUDINAL CODE

o 345° E

- 45° E

45° E- I05°E

V 105° E

- I65°E & 165° E- 225° E o 225° E

- 285° E

ft 285° E- 345° E

90° SOUTH

60° 30" 0* 30'

\* GEOGRAPHIC LATITUDE

60* 90* NORTH
-70-

FOURIER COEFFIOENTS FOR foF2 MONTHLY MEDIANS

04 JUNE 1958 118 STATIONS

0.

0.2

2 0.

0.0. u

u.

8-0.1 o

§-0.2 o

-o.:

-0:

-0.S

I I | I I | I I

1 1 1 I I L_t

I I |

I I

| I I

«' o

o v

_L_J L_J I I I L

0.4

0.3

0.2

90° 80"

DECEMBER 1958

30* 30' 60* 90*

118 STATIONS

0.1 NO

yo.o

8-o.

onUJ

a. 0.2

-0.3

-0.4

-0.5

I I I I

a7

LONGITUDINAL CODE !

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- IG5°E

A 165° E

- 225° E © 225° E

- 285° E

ft 285° E

- 345° E

90° 80° SOUTH

30* 0* 30*

X- GEOGRAPHIC LATITUDE

90* NORTH
-71-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

q

4 JUNE 1958 H8 STATIONS

r— —

1

1 1 1 1 1 1 1

1 1 1 ! 1 | 1 1

0.3 —

0.2 V

* »

u * • 2 0.1

-Q

a • • • z on

A

c

• * * • * a »

. » if * ' r • * • o

u.

u.o-O.t o

<rUJ§-0.2 ou.

i

* A

V

•

*

• *

V A •

•

*

o

o

• • • • ••*•#*•• • • — *

• *

•

-0.3 —

-0.4 —

-0.5 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

0.4

90° 60" 30*

DECEMBER 1958

30° 60* 90*

118 STATIONS

0.3

0.2

0.1

y 0.0 u

8-0.1

crUJ^0.2

o

-0.3

.-0.J

^o.s

B 2

I I l 1 I J I I 90° SOUTH

60° 30" 0" 30*

X= GEOGRAPHIC LATITUOE

60' 90' NORTH

b7

LONGITUDINAL CODE

o 345° E- 45° E

D 45° E- I05°E

•7 105° E

- I65°E A 165° E

- 225° E O 225° E- 285° E

<J 285° E- 345° E
-72-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

0.4 JUNE 1954 68 STATIONS

a7

0.i

0.2

0.0 o

u.

u.8-0. o

a

\H§-0.2 p

-0.5""

I I |

I I | I I

1 I I I I . I I I

I I | I I | I I

»% * * • •

•

0.4

0.3

0.2

90* 60° 30*

DECEMBER 1954

30* 60* 90*

64 STATIONS

0.1

yo.o

g-o.i

a.—

^0.2

-0.3

-0.4

-0.5

I I |I I

| I

i I I

1

I

1

I I I I

LONGITUDINAL CODE

o 345° E

- 45° E

D 45" E- I05°E

V 105° E

- I65°E

& 165° E

- 225° E O 225° E

- 285° E

fc 285° E- 345° E

90* SOUTH

30° 0° 30"

X« GEOGRAPHIC LATITUOE

90* NORTH
-73-

0.4

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1954 68 STATIONS

b 7

0.3

0.2

* 0.1 —

x> —

S o.o —

o-0.^— o

S-0.2

-0.5

0.3 —

-0.4

I I | I I | I I

• *

ft a - A, 1

0.4

0.3

0.2

90* 60' 30°

DECEMBER 1954

60° 90*

0.1 -Q

^0.0 o

8-0.1

£0.2

o

-0.3

-0.4

-0.5

I I |

I I |I 64 STATIONS

I I | I

I

|

I

' I

I I I 1I I

1 J I

LONGITUDINAL CODE

o 345° E

- 45° E

O 45" E

- I05°E

V 105° E

- I65°E

a 165° E

- 225° E o 225° E

- 285° E

'& 285° E- 345° E

90° 60° SOUTH30* 0' 30°

X= GEOGRAPHIC LATITUDE

60' 90° NORTH
-7-*-

FOURIER COEFFIOENTS FOR foF2 MONTHLY MEDIANS

04 MARCH 1958 H8 STATIONS

a8

0.2

go4

o-O.I

5-0.2

-0.3

-0.5

I I | I I | I I

I I I I I I I I

I I | I I | I I

. •» .

*

.

-»•—«. « % i .

I I I I I I I [ 90" 30'

0.4

0.3

0.2

0.1

CD D

I-^0.0

o

UJ8-0.1 K

UJ^0.2

-0.3

"0.5

SEPTEMBER 1958 *n

60* 90*

113 STATIONS

I I

1

I I I I I I 1I I

I I | I ! | I I

, a 1 , 1 ^ » . !• •"# » «

LONGITUDINAL CODE

o 345° E- 45° E

a 45° E- I05°E

V 105° E

- I65°E

& 165° E

- 225" E o 225° E- 285° E

<> 285° E- 345° E

90" SOUTH60° 30° 0" 30°

X- GEOGRAPHIC LATITUOE

90" NORTH
-75-

0.4

0.2

CO .a

0.0

S-o.i o

5-0-2 o

-0.'

-0.5L

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 118 STATIONS

I I

I

I !

I I I

I I I I

I I I I

I I I I I

I I I

»«

• «-• • • #

•

• • • ••. .\ :

-

_LJ I

1 1

0.4

90° 80" 30*

SEPTEMBER 1958

60* 90*

113 STATIONS —

0.3

0.2

CO

0.1

y 0.0 y

8-0.1 K

UJ

0.2

-0.3

I I [ I 1 J

I I I I

I I II

I I

« • *• o »

•

» » - ' . u

I I l I I l I I 60° SOUTH

30" 0» 30*

\« GEOGRAPHIC LATITUDE

80' 90* NORTH

LONGITUDINAL CODE

345° E- 45° E

D 45° E

- I05"E

V 105° E

- I65°E

& 165° E

- 225° E O 225° E

- 285° E 6 285° E

- 345° E
-76-

0.4

0.2

2 0.

2o.o

o

u.

u.8-0.1 o

§-0.2 o

-0.3

-0.5

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1954 66 STATIONS a

i

1

1 i

1

1 i i

i_j 1 1 i, i

i i ii 1 1 i i

j -

**—i«

J I I I L

30° 60* 90*

0.4 SEPTEMBER 1954 63 STATIONS _l 1 [

t ! | ! 1 1 I | I 1 | 1 1

0.3 —

-

0.2 —

2""

0.1

*

«

00 o

t-y 0.0 o

b.

U.

S-o.i

*

* o

• «

•*

A a — »

o ——

a.UJ^0.2 o i —

—

-0.3 —

-0.4 —

_n t; "l 1 1 1 1 1 1 1

. 1 1 1 1 1 1 1 1

LONGITUDINAL CODE

o 345" E- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

& 165° E

- 225° E O 225° E

- 285° E

ft 285° E- 345° E

90° SOUTH

60° 30° 0" 30"

X- GEOGRAPHIC LATITUOE

90" NORTH
-77-

FOURIER COEFFICIENTS FOR f6F2 MONTHLY MEDIANS

0.4,

0.2

5 °-

oo 5 0.0

g-0.1

o

5-0.2 o

-0.5L

66 STATIONS rrf 1 1

1 1 1 1 1 1 1

1 1

1

1 1

1 1 i 1

—*—?—'"v*-

0.4

90° 60° 30*

SEPTEMBER 1954

30*

0.3

0.2

0.1

CO -Q

^0.0

o

8-0.1

UJe

0.2

-0.3

-0.

-0.

I I |

I I

I

I I

60* 90°

63 STATIONS

90°

I I I I I I I I

I I

I I II I I

* t <~» < 2_

LONGITUDINAL CODE

345° E- 45° E

45° E- I05°E

V 105° E

- I65°E A 165° E

- 225° E O 225° E- 285° E G 285° E- 345° E

60° SOUTH

30° 0° 30*

X- GEOGRAPHIC LATITUDE

90* NORTH
-78-

FOURIER COEFFIOENTS FOR foF2 MONTHLY MEDIANS

qj JUNE 1958 118 STATIONS

0.

0.2

S 0,

0.0

S-o.i o

5-0.2 o

-0.5 J I I I I 1 I I

I I | I I | I I

•/•v

J L_l I I L_L

0.4

0.3

0.2

0.1

90° 60°

DECEMBER 1958

30" 60' 90s

118 STATIONS

^0.0 y

u.

u.UJ8-0.1

^0.2

-0.3

-0.1

i I M I

I

I

I l I i I 1 l I I I l I

i i | I i | I l

8 «. k t

9 D

**

80° SOUTH

30» 0° 30"

X- GEOGRAPHIC LATITUOE

80° 90° NORTH

@

LONGITUDINAL CODE

o 345° E

- - 45° E

o 45° E

- 105° E V 105° E

- - I65°E

A 165° E

- 225° E O 225° E

- 285° E

tt 285° E

- 345° E
-79-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

04 JUNE 1958 118 STATIONS

0.

0.2

-Q| OJ.

8-0.1 o

5-0.2 o

-0.3

-0.5

o v «

* v^r «p *

I I

1

I I I

0.4

90° 80° 30°

DECEMBER 1958

60° 90°

118 STATIONS

0.3

0.2

.Q

0.0

8-0.1

^0.2 o

-0.3

-0.4

-0.5

n ,—fl_ » •„••

90° 60° SOUTH30" 0° 30"

X= GEOGRAPHIC LATITUDE

60* 90° NORTH

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E o 225° E

- 285° E 6 285° E- 345° E
-8o0.4

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1954 68 STATIONS

0.2

2 0.

2 0.0. o

S-o.i o

oc

5-0.2

-0.5

ii I

i i | I i I i r| i q

-%-TT«.»»

d

LJ L_J I I I I I I L_J L_J I L

0.4

90° 60°

DECEMBER 1954

W

0.3

0.2

0.1

oo oy 0.0 y

8-Q.i

I

|

I ! I

SO* 90*

64 STATIONS

t _ u|0.2-

>

L

-0.3

-0.<

-a. w

i i i

1

I

I I I I I I I

SOUTH

30° 0° 30°

X- GEOGRAPHIC LATITUDE

80° 90° NORTH

®

LONGITUDINAL CODE

o 345° E

- 45° E

a 45° E- I05°E

^7 105° E- I65°E

a 165° E

- 225° E o 225° E

- 285° E

ft 285° E- 345° E
-81-

0.4

FOURIER COEFFiaENTS FOR foF2 MONTHLY MEDIANS

JUNE 1954 68 STATIONS

0.:

0.2 —

X 0.1

00

o

8-0.1 o

§-0.2 o

-0.5L

I I

I I I I

I I I I I

I I

I I I

i

0.4

90c eo°

DECEMBER 1954

30° 60° 90°

64 STATIONS

0.3

0.2

m0-' 00

¥-^0.0 o

u.

8-0.1

r0.2

-0.5

I I

I

I I

I

I I

I I I 1 I 1 I I 60° SOUTH

30° 0" 30°

X* GEOGRAPHIC LATITUDE

80" 90° NORTH

LONGITUDINAL COOE

345° E

- 45° E

D 45° E- I05°E

V 105" E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

is 285° E

- 345° E
-82-

FOURIER COEFFIQENTS FOR foF2 MONTHLY MEDIANS

6 MARCH 1958 "8 STATIONS

.5

2 .3

.2 —

o

o

O

1 1 1 1 1 1 I 1

4 _ ' '• • • * * *

1 1 11 1 1

1 1

4 °

» ». •

• # * *• n *

• • _• » *

. W * •• «k A

a 4 — A ° A

1 1 1 1 1 1 1 1

*« ° ' A

• A

• A

V

-.3 II l 1 1 l 1 'l

90* 60*

e SEPTEMBER 1958

5 —

.4 —

60° 90'

113 STATIONS

o

y

u.

UJo I o

CEUJ5 o o

-.3

I 1 1 1 1 1I 1

*

•

• * »•

V

• 4 * *

1 1 | 1 1 | 1 1

4

4 •

• • a * •

O * A * * , * >« • a . $ »•

4 * 4

4 4 — 4

1 1 1 1 1 1 1 1

• • / O A A .*•„. ..

* —

1 1 l 1 1 l 1 1

-.2

90" SOUTH

30° 0* 30°

X* GEOGRAPHIC LATITUDE.

SO" 90' NORTH

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

ft 285° E

- 345° E
-83-

F0UR1ER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 118 STATIONS

0.5 J 1 1 l!|! 1 1 1 | 1 1 | II

0.4

0.3

o

• —

i0.2

0) -O-5 o.i o

u.Si

*

•

*

* V

* *

•

•

» 1 •

* *

• •

*

a

• •

a • ,

t> a o . ff *.••

8 o.o E

UJ

(Tg-0.1

u.

_ * .

* •

* «

4 * 4

*

• • 4

-0.2

£

-0.3

-04 1 1 l

1 1 1 1 1 1

1 1 1 1 1 1 1 90" 30"

A S SEPTEMBER 1958 113 STATIONS

1 1 |

1 1

1

' 1

1

1 1

1 1 | 1 1

0.4

* —

0.3 — • —

2

4 —

y 0.1 o

U.

U.

UJ8 0.0

orUJ

5-0.1 OIL.

A

*

A

A *

•

a

• 4 9

•

• *•

• • V • "

•»47 * •. •

•

• '_} - * -

*

*

4

4 — *

A

•*

4

4 • *••• »

• » •* 4

• A .' *

' . —

& —

4 -0.2

•

-0i —

-04 1 1 1 1 1

1 1 1 1 1 1 1 l 1 1 90" SOUTH

30" 0* 30*

X« GEOGRAPHIC LATITUOE

60* 90* NORTH

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E- I65°E

A 165° E

- 225° E O 225° E- 285° E £ 285° E- 345° E
-84-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

6 MARCH 1954 66 STATIONS

2 .3

z 2

o l o

3

o

-.2

r r |

i i |

i i

j i I i i 1 [ i

i i I

i i

I

i I

> •••.

J I l_l I I I L

90° 60" 30°

. SEPTEMBER 1954

30' 60° 90°

63 STATIONS

D

uj 2 o

o I

%

o

-1

-.3

I I |I I |

I I 1 I | I I | I I

o

* ' • .

« * „ ; *• • *». « • a

-—. « c t

* 9 • • - £ —

I 1 1I I I

1

I

1 1

I I

1

I 1I 1

LONGITUDINAL CODE

o 345° E- 45° E

D 45° E- I05°E

7 105° E- I65"E

A 165° E

- 225° E O 225° E- 285° E

ft 285° E- 345° E

90° 60° SOUTH

30° 0" 30°

X- GEOGRAPHIC LATITUOE

eo° 90° NORTH
-85-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1954 66 STATIONS

U.b

1 1

1 1 l|ll 1 1 1

1 1 I

1 l —

0.4

0.3

u

5o.2

_Q

h- • 5 o.i o

u.u.

UJgo.o

cr

*

V

* -

6 * * •

UJ

org-0.1

u. — •

-0.2

-0.3

-04 I 1 1 1

1 1 1 1

1 1 l 1 1 l 1 1

0.5

0.4

90* W 30*

SEPTEMBER 1954

60" 90°

63 STATIONS

0.3 —

-Q

0.2 —

5 o.i u

8o.o

UJ

-0.1

-0.2 —

-0.3

-0.4

*

_ *

. '— . —--U

I. * _ »

" * • * _

• * V

I I I I I 1 I I I I I I I I I I 90" SOUTH

S0° 30* 0* 30'

X- GEOGRAPHIC LATITUOE

90* NORTH

LONGITUDINAL CODE

o 345° E- 45° E 45° E

- I05°E

7 105° E- I65°E

& 165° E

- 225° E o 225° E

- 285° E 6 285° E- 345* E
-86-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

« JUNE 1958 118 STATION!

2 .3

z

UJ

O

o

<rUJ

<rz>o

.2 —

1 1 1 1 1 1 I 1

— V _ •

— * *

1 1 | 1 1 [ 1 1

D

*

•o •

o

v * •

* O * „*••.•/•*•

.'

4 *

9 A V

A V •

o *.

A A

1 1 1 1 1 1 I 1

° " * * _

I 1 1 1 1 1 1 1 90° 60° 30°

DECEMBER 1958

60° 90*

118 STATIONS

CT> D

o |

§

o

-.2

I I | I I | I I

* V *

jB—

,* «

I I I I

1 1

I I 90° 60° SOUTH

30" 0° 30*

X« GEOGRAPHIC LATITUDE

»• 90* NORTH

LONGITUDINAL CODE

o 345° E

-

- 45° E

D 45° E

-

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

«r 285° E

- 345° E
-87-

0.5

0.4

0.3

50.2

-Q

0.1

FOURIER COEFFICENTS FOR foF2 MONTHLY MEDIANS

JUNE 1958 H8 STATIONS

0.0

cr

crg-0.1

-0.2 —

-0.3

-0.4

1 1

1 1 1 1

1 1

c

•

o

* A *

1 I | 1 I | 1 1

•

• «

* • * ft o • • *

| •

V

A

1 1 1 1 1 1 1 1

V • * V . *

1 I 1 1 1 1 1 1 90' 60" 30

s

DECEMBER 1958

30* 60" 90°

118 STATIONS

U.J

1 1

1

I 1

1

1 1

1 1 1

1 I | 1 1

0.4

0.3 —

' 2

y 0.1 o

U.

Ll. UJgo.o

cr

til

5-0.1 o

A

A

•

•

*

•

*A

*

* •*

- •

• a

*

• • •

__ V

A » A «,

» *

4 • * * V

*

•

-0.2

• • - -

-0.3

-0.4 1 1

1 1 1 1 1 1 1 1 1 1 1 1 1 1 90° SOUTH

60° 30" 0° 30°

\» GEOGRAPHIC LATITUDE

90" NORTH

LONGITUDINAL CODE

o 345° E

- 45° E 45° E

- I05°E

V 105° E

- I65°E

& 165° E- 225° E o 225° E- 285° E

fc 285° E- 345° E
-88-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

R JUNE 1954 68 STATIOI

z 2 o

O -I

anUJ5 o ou.

n~r

I I I 1 I 1 J L_J I I I L

90° 80* 30'

B DECEMBER 1954

30° 60° 90"

64 STATIONS

.3 —

z

o I o

O.UJS o o

1 1 11 1

1

1 1

i —_ *

_ ** «o

1 1 | 1 1 | ! !

. •

•

o * "

«

1 1 1 1 1 1 1 1

• • • —

••• __

1 1 l 1 1 l 1 1

-2

90° 60° SOUTH

30* 0° 30°

\« GEOGRAPHIC LATITUDE

60° 90° NORTH

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

6 165° E

- 225° E O 225° E

- 285° E 6 285° E

- 345° E
-89-

0.5

0.4

0.3

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1954 68 STATIONS

i0.2

-Q I

O0.0

=-0.1

-0.2

-0.3

-0.4

» »»*

I I

| I i T I I

. *»

* . . t « •i

j_i Lj i I i i

05 jfcCEr/BER 1954 64 STATIONS

1 1 | 1 1 | 1 1 1 1 | 1 1 | 1 1

0.4

- —

0.3 —

'

V

y 0.1 o

till. UJgo.o

UJ

5-0.1 o

u.

V

+

*

a

« *

1

-0.2 —

-0.3 —

--04 1 1 1 i 1 1 1 1 1 1 1 1 1 1 1 1

LONGITUDINAL CODE

o 345° E

- 45° E

o 45° E- I05°E

<? 105° E

- I65°E

A 165° E

- 225° E O 225° E- 285° E

<t 285° E- 345° E

90° 60° SOUTH30° 0° 30°

X- GEOGRAPHIC LATITUDE

60° 90' NORTH
-90-

0.4

0.2

* °- 1 o

o

0.0

S-0.1 o

(E

UJ5-0.2 p

-0.3

-0.4

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 118 STATIONS

-0.5.1 I I

1

I

V I

| I I | I I

*»—i^-

90" 30

e

0.4 SEPTEMBER 1958

30* 60* 90*

113 STATIONS

0.3

0.2

0.1

^ 0.0 o

g-o.i

ccUJ£0.2

o

-0.3

-0.4

'90°

* t* •* m m i

I I I I I I I I 60° SOUTH

30° 0" 30'

X- GEOGRAPHIC LATITUOE

80° 90* NORTH

Q|0

LONGITUDINAL COOE

o 345° E

- 45° E

D 45° E- I05°E

7 105° E- I65°E

A 165° E

- 225° E O 225° E

- 285° E

ft 285° E- 345° E
91-

0.4

0.2 —

0.1 —

o

.a

0.0

8-0.1 o

acUJ5-0.2 o

-0.3

-0.5

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 118 STATIONS

« 4 4

*

- . ,'..,.>•••.•/.• . _

90° 60° 30°

SEPTEMBER 1958

0.4

0.3 —

0.2 —

60° 90"

113 STATIONS

g

JQ

0.1

^0.0 u

Li.

Li. UJ8-0.1

ir

UJ

5-0.2 o

-0.3 —

-0.4

-0.5

1 1 11 1 11 1

— m

1 •

1 ! |

1 1 | I 1

•

• . » o _

V * o *

A* * *

A

"' ' * 4 4

•

*

1 1 1 1 1 1 1 1

• ° . • . .

1 1 1 i 1 1 1 1 90° 60° SOUTH

30° 0° 30°

X- GEOGRAPHIC LATITUDE

60° 90° NORTH

bio

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

ft 285° E

- 345° E
-92-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1954 66 STATIONS

1 1 | 1 1 | 1 1 1 1 | 1 1 | 1 1

s

~

"

0.2

u

o

t-?.

" 9

/ * • • •

V

. • —

« •

u

u.

S-0.1 a

• - V

•

•

• » —

y

5-0.2 ou.

• ___

-0.3

-0.4

-OS 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 90° 30'

0.4

0.3

0.2

SEPTEMBER 1954

90*

DNS

0.1

0.0

o-o.i

—

^0.2

-0.3

-0.4

-0

T . I

90°

I I | I I | I I

I

1 I I 60° SOUTH

30° 0° 30°

X« GEOGRAPHIC LATITUDE

90" NORTH

Qio

LONGITUDINAL CODE

o 345° E- 45° E

45" E- I05°E

V 105" E- I65°E

a 165° E

- 225° E o 225° E

- 285° E

tt 285° E- 345" E
0.4

0.!

-93-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1954 66 STATIONS

b, (

0.2 —

0.1 o

0.0

g-0. o

3TO

-0.3

--0.<

-0.5

I I | I I | I I I I | I I | I I

J I Lj LJ L_L

0.4

90° 60° 30°

SEPTEMBER 1954

0.3

0.2

g

0.1

^ 0.0 o

8-0.1

ac—

^0.2 ou.

-0.3

-0.

I I |I I | I

60° 90°

63 STATIONS

90° SOUTH

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E © 225° E- 285° E 6 285° E

- 345° E

30° 0° 30Q

X- GEOGRAPHIC LATITUOE

90° NORTH
-9kFOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

04 JUNE 1958 118 STATIONS

1

1 1

1 1

1

1

1

1 1

1 1 | 1 1 —

0.3 —

0.2

*T £ » —

u* °'' o

o

t-^00

Ck •

• *

• *

•

•

e

o

a.W ft i O-0.I o

*

a

* • •

*

A

V

a * * » *

• »

ITUJ5-0.2 oLi.

-0.3

-0.4 "ill 1

1 1 1

1 1 1 1 1 1 1 1

0.4

0.3

0.2

90° 60°

DECEMBER 1958

30°

0.1

yox o

u.

8-0.1

^0.2

o

-0.3

-0.'

•0.5

i r~r~i i I r~r

30° 60" 90°

118 STATIONS

"-..'»;

i i I i i I i i 90" SOUTH

60° 30° 0° 30'

X= GEOGRAPHIC LATITUDE

60" 90° NORTH

QlO

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

is 285° E- 345° E
-95-

0.4

0.2

S 0.1 n

| 0.0 o

S-o.i o

a —

5-0.2

-0.3

-0.5

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1958 118 STATIONS

I I | I I |I I I I I |I I

| I

» • fc. _• • • • *r-Tr ».«.*-• " *

1_J Lj I I L

0.4

90* 60° 30"

DECEMBER 1958

30° 60° 90"

118 STATIONS

0.3

0.2

o

0.1

tfOJ u

.0-

8-oj

^0.2 o

-0.3

-0.4

-0.5

-»—•-

90* SOUTH

30° 0° 30"

X« GEOGRAPHIC LATITUOE

80

c 90° NORTH

bio

LONGITUDINAL CODE

o 345° E - 45° E

D 45° E

-

• 105° E V 105° E

- I65°E

A 165° E

- 225° E © 225° E

- 285° E

tl 285° E

- 345° E
-96-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS Qio

04 JUNE 1954 68 STATIONS

I

1

1 1 I | 1 ! I 1 | I 1 | 1 1 —

0.3

• 0.2 — —

uS 0.1 o

o5 o.o o

u.u.w ft 1 o-O.I o

*

•

#

ft

• « *

V •

*

\ •• * *

crUJ1-0.2 o

u. —

-0.3 —

-0.4 —

-ns 1 1 1 1 1 1 1 1 III! 1 1 1 1

0.4

0.3

0.2

90° 80*

DECEMBER 1954

30* 30° 60' 90*

64 STATIONS

0.1

0.0

8-oj

a.UJ

cr 0.2

-0.3

-0.4

-0.5

I I | I I

| I I

o* iPa " »

I I l 1 I l I I

LONGITUDINAL CODE

o 345° E- 45° E

D 45° E- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

Si 285° E

- 345° E

90° 60° SOUTH

30' 0' 30*

X* GEOGRAPHIC LATITUOE

60° 90' NORTH
-97-

0.4

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1954 68 STATIONS w

0.3

0.2

S 0.1 n

| 0.0 o

S-o.i o

5-0.2 o

-0.3

-0.4

-0.5

I I | I I | I I

• Av

I I I 1 I I I I

f I | I I | 1 I

'* .- . V

-*x—- ^rr

0.4

90" 60° 30°

DECEMBER 1954

0.3 —

0.2

o

0.1

y 0.0 o

u.

u.8-o.iltr

UJ^0.2

-0j

I I | I I

1 I I

SO 90°

64 STATIONS

0.3 —

'%

-* •* '«.—! »T

LONGITUDINAL CODE

345° E

- 45° E

45° E

- I05°E

7 105° E

- I65°E

A 165° E

- 225° E o 225° E- 285° E

ft 285° E

- 345° E

60° SOUTH30° 0° 30°

X* GEOGRAPHIC LATITUOE

60° 90° NORTH
-98-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

4 MARCH 1958 118 STATIONS

O.i

0.2

u

6"

0.0 o

b.

§-0.1 o

a:

§-0.2 o

-0.*

I I | ! I ! I I

I 1 t I 1 I I

I I

I

I I

I I I

*» • *•. *« :*-*-

.» •*'

J_J 1 I I 1 1

I

0.4

90' W 30*

SEPTEMBER 1958

30* 60" 90°

0.3

0.2

0.1

y 0.0

8-0.1

^0.2

o

-0.3

I I I I I I

1

I

113 STATIONS

I I | T I I' I 1

• » •

...

I I

1

I I I I

1 eo° SOUTH

30' 0« 30°

X- GEOGRAPHIC LATITUOE

80° 90° NORTH

Q||

LONGITUDINAL CODE

o 345° E

- 45° E

a 45° E

- 105° E 7 105° E

- I65°E

A 165° E

- 225°E o 225° E

- 285°E

ft 285° E

- 345°E
-99-

0.4

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1958 118 STATIONS

I I I | I I | I I

0.2 —

5 °-

0.0 o

o-O.I o

5-0.2 o

-0.51

0.3 —

« —

J L_J I I I L

0.4

0.3

0.2

0.1

^0.0

8-0.1

or

90' 80° 30*

SEPTEMBER 1958

60° 90s

r0.2

-0.3

I I I! I J

I I

""ft

L

113 STATIONS

I I I

I I

I

I I

1 1

I 1 1 60" SOUTH

30° 0' 30"

X« GEOGRAPHIC LATITUOE

80" 90" NORTH

LONGITUDINAL CODE

345° E

- 45° E

45° E

- I05°E

V 105° E- I65°E

a 165° E

- 225° E 225° E- 285° E

ft 285° E- 345° E
-100-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

0.4 MARCH 1954

0.2

0.0

8-0.1 o

5-0.2 p

-0.51

f I | ! I

I

I I

I I t I 1

66 STATIONS STATI<

I I | I I | I I

_L_J 1_J L_J I L

0.4

0.3

90° 80° 30*

SEPTEMBER 1954

60* 90°

63 STATIONS

0.2 —

2

- 0.1 o

^0.0

o

u.

ii. UJ8-0.! K

—

0.2

-0.3 —

-0.

1 1 1

I 1

I

1 1 1 1 ] 1 1 | 1 !

—

» • : •*

- . * *

1 •

1 1 1 1 1 1 1 1

-

* •

• »

• —

1 1 1 1 1 1 1 1 90SOUTH

30" 0° J0°

X- GEOGRAPHIC LATITUOE

80° 90° NORTH

On

LONGITUDINAL CODE

o 345° E

- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

& 165° E- 225° E o 225° E

- 285° E a 285° E

- 345° E
-101-

0.4

0.3

0.2

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

MARCH 1954 66 STATIONS

z o.i

*

XIH

5 0.0 O

U.

u.O-0.I O

(TUJ5-0.2 OLl.

-0.3

-0.5

I I II I

I I I

v m y

* 5 •

•

. - . * «

J I L_J I I I L

0.4

0.3

0.2

0.1

y 0.0

8-0.1

§0.2 o

-0.3

-0.4

90° 60° 30°

SEPTEMBER 1954

30° 60° 90*

63 STATIONS

-0.5

I I

J

I I

I

I I

I I 1 90° 60 c SOUTH

30° 0° 30°

\= GEOGRAPHIC LATITUDE

60' 90' NORTH

LONGITUDINAL CODE

345° E

- 45° E

D 45° E

- I05°E

<? 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

£r 285° E

- 345° E
-102-

0.4

0.2

so,

S-o.i o

§-0.2 ou.

-0/

-O.*

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNEMM1958 118 STATIONS

w

* »

1 1 1 1 i 1 i 1

I I

I

I I

I I

j_j L_i 1 1 1 1 90' 30' 30'

0.4

0.3

0.2

- 0.1 o

t-^ 0.0 o

8-0.1

£0.2

o

-0.3

DECEMBER 1958

60° 90"

118 STATIONS

I f[ I I

I I

I I I I I 1 I I

v. -

• • • *

_• * 2* i_

90° SOUTH60° 30° 0« 30"

X- GEOGRAPHIC LATITUOE

90° 90° NORTH

'LONGITUDINAL CODE

345° E

- 45° E

a 45° E- I05°E

y 105° E

- I65°E

A 165° E

- 225° E O 225° E- 285° E

is 285° E

- 345° E
103-

0.4

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1958 118 STATIONS

0.3

0.2

O.Oh

S-0.1 o

UJ5-0.2

-0.3

-0.5

I I | I I

| I f

> —

0.4

0.3

0.2

0.1

y 0.0

8-0.1

UJ^0.2

-0.3

-0.4

90° a°

DECEMBER 1958

30° 60° 90'

118 STATIONS

0.5

V. *

• t » 4

90" SOUTH

60* 30* 0* 30*

X* GEOGRAPHIC LATITUDE

SO' 90* NORTH

LONGITUDINAL CODE

o 345° E- 45° E

D 45° E

- I05°E

V 105° E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E 6 285° E

- 345° E
-104-

0.4

0.2

5 °-

2 o.o

S-o.i o

3O

-Oj

-0.5*-

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1954 68 STATIONS

Ov

1 I | I I | I I

J i 1 i i I L

I I

I

I !

I

I I

-*—

.

• „.

' *£>.'

• .• t .'*

±_J l_J I I L

90c 60" 30"

DECEMBER 1954

60° 90°

64 STATIONS

U.I III i i ; i i i i 1 i i

1

i 1

0.3 —

0.2 —

2

r o.i o

1-y 0.0 u

u.

ILUJ8-0.1

*

*

• * • • • ••

—

__ *

» n

• •

° ° » » »

* *

• *

* —

UJ^0.2

o

u.

D —

-0.3 '

-0.4 —

- n c "ill i i 1 i i

1 1 1 1 I 1 ! 1

LONGITUDINAL CODE

o 345° E- 45C E

45° E

- I05°E

V 105" E

- I65°E

A 165° E

- 225° E O 225° E

- 285° E

fc 285° E

- 345° E

90° SOUTH60° 30° 0° 30°

X- GEOGRAPHIC LATITUOE

60' 90' NORTH
-105-

0.4

0.2

0.1

0.0

O-0.I o

5-0.2 p

-0.9

FOURIER COEFFICIENTS FOR foF2 MONTHLY MEDIANS

JUNE 1954 68 STATI ON*

I I | I I | I I i i i i i

i rr

-*JL

J_l I I I I I I 904 80" 30°

DECEMBER 1954

30* 90*

64 STATIONS

U.I

1

1 1 1

1

1 '

1 1 1

1

1 1 1

1 1

0.3 — —

0.2 —

3E —

_o.i

1-^0.0

o

Ulu.

UJ8-0.1

*

* •

a

•

A »

» • -

" 4

• •

• •

•

<rUJ£0.2

o —

< —

-0.3

-0.4

°1 1 1 1 1 1 1 1 I

1 1 l 1 1 l 1

1 0° 60° 30° C

• 30* 60° 90

LONGITUDINAL CODE

o 345° E

- 45° E 45° E

- I05°E

V 105° E

- I65°E

a 165° E

- 225° E o 225° E

- 285° E LL 285° E- 345° E

SOUTH NORTH

X- GEOGRAPHIC LATITUOE

IJ. S. DEPARTMENT OF COMMERCE

Luther H. Hodges, Secretary

NATIONAL BUREAJU OF STANDARDS

A. V. Astin, Director

THE NATIONAL BUREAU OF STANDARDS

The scope of activities of the National Bureau of Standards at its major laboratories in Washington, D.C., and

Boulder, Colorado,,- is suggested in the following listing of the divisions and sections engaged in technical work.

In general, each section carries out specialized research, development, and engineering in the field indicated by

its title. A brief description of the activities, and of the resultant publications, appears on the inside of the

front cover.

WASHINGTON, D.C.

Electricity. Resistance and Reactance. Electrochemistry. Electrical Instruments. Magnetic Measurements.

Dielectrics. High Voltage.

Metrology. Photometry and Colorimetry. Refractometry. Photographic Research. Length. Engineering Metrology.

Mass and Scale. Volumetry and Densimetry.

Heat. Temperature Physics. Heat Measurements. Cryogenic Physics. Equation of State. Statistical Physics.

Radiation Physics. X-ray. Radioactivity. Radiation Theory. High Energy Radiation. Radiological Equipment.

Nucleonic Instrumentation. Neutron Physics.

Analytical and Inorganic Chemistry. Pure Substances. Spectrochemistry. Solution Chemistry. Standard Refer- ence Materials. Applied Analytical Research.

Mechanics. Sound. Pressure and Vacuum. Fluid Mechanics. Engineering Mechanics. Rheology. Combustion

Controls. Organic and Fibrous Materials. Rubber. Textiles. Paper. Leather. Testing and Specifications. Polymer Structure. Plastics. Dental Research.

Metallurgy. Thermal Metallurgy. Chemical Metallurgy. Mechanical Metallurgy. Corrosion. Metal Physics. Electrolysis and Metal Deposition.

Mineral Products. Engineering Ceramics. Glass. Refractories. Enameled Metals. Crystal Growth. Physical

Properties. Constitution and Microstructure. Building Research. Structural Engineering. Fire Research. Mechanical Systems. Organic Building Materials. Codes and Safety Standards. Heat Transfer. Inorganic Building Materials. Applied Mathematics. Numerical Analysis. Computation. Statistical Engineering. Mathematical Physics. Operations Research. Data Processing Systems. Components and Techniques. Computer Technology. Measurements Automation.

Engineering Applications. Systems Analysis.

Atomic Physics. Spectroscopy. Infrared Spectroscopy. Solid State Physics. Electron Physics. Atomic Physics.

Instrumentation. Engineering Electronics. Electron Devices. Electronic Instrumentation. Mechanical Instru- ments. Basic Instrumentation. Physical Chemistry. Thermochemistry. Suiface Chemistry. Organic Chemistry. Molecular Spectroscopy. Molecular Kinetics. Mass Spectrometry.

Office of Weights and Measures. BOULDER, COLO.

Cryogenic Engineering. Cryogenic Equipment. Cryogenic Processes. Properties of Materials. Cryogenic Technical Services. Ionosphere Research and Propagation. Low Frequency and Very Low Frequency Research. Ionosphere Research.

Prediction Services. Sun-Earth Relationships. Field Engineering. Radio Warning Services. Vertical Soundings Research. Radio Propagation Engineering. Data Reduction Instrumentation. Radio Noise. Tropospheric Measurements.

Tropospheric Analysis. Propagation-Terrain Effects. Radio-Meteorology. Lower Atmosphere Physics.

Radio Standards. High Frequency Electrical Standards. Radio Broadcast Service. Radio and Microwave Materials. Atomic Frequency ana Time Interval Standards. Electronic Calibration Center. Millimeter-Wave Research.

Microwave Circuit Standards. Radio Systems. Applied Electromagnetic Theory. High Frequency and Very High Frequency Research. Modulation

Research. Antenna Research. Navigation Systems.

Upper Atmosphere and Space Physics. Upper Atmosphere and Plasma Physics. Ionosphere and Exosphere

Scatter. Airglow and Aurora. Ionospheric Radio Astronomy.
x<&

NBS