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QUARTERLY RADIO NOISE DATA

MARCH, APRIL, MAY 1961

BY W.Q.CRICHLOW, R.T.DISNEY, AND M.A. JENKINS

APARTMENT OF COMMERCE

>NAL BUREAU OF STANDARDS
THE NATIONAL BUREAU OF STANDARDS

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NATIONAL BUREAU OF STANDARDS

technical Ntete

No. 18-10

August 14, 1961

QUARTERLY RADIO NOISE DATA

MARCH, APRIL, MAY 1961

by

W. Q. Crichlow, R. T. Disney, and M. A. Jenkins

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 literature. 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 $ 1 . 50

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NOMOGRAM FOR TRANSFORMING EFFECTIVE ANTENNA NOISE FIGURE

TO NOISE FIELD STRENGTH AS A FUNCTION OF FREQUENCY

1 Mc

(Megacycles)

-jj-70

1-50

30

9 lit +6 5--

+4

:-2

l-r

06

0.09

;

0.07

-

ir0.9 +0.7

•0.5 04 -jj-

-11-03

0.2 JL

0.1 +0.08 +0.06

0.05

-

4-0.04

0.03 -|h

-0.02

Fa

(db above ktb)

-r-20

0--

40 —

120

160 --

En

(db above I /av/meter)

--50

-40 4-

-20--

0--

:-IO

--I40

60--

80

L- En =Fa + 20log (0

fMc -65.5

Fa = Effective Antenna Noise Figure = External Noise Power

Available from an Equivalent Short, Lossless,

Vertical Antenna in db Above ktb. En= Equivalent Vertically Polarized Ground Wave R.M.S. Noise

Field Strength in db Above 1/iV/meter for a I kc Bandwidth.

fMc

= Frequency in Megacycles.
Radio Noise Data for the Season

March, April, May 1961

Radio noise measurements are being made at sixteen stations

in a world-wide network supervised by the National Bureau of

Standards (see map). The results of these measurements for the

period March, April, May 1961 are presented in the attached tables.

These are based on three parameters of the noise: (1) the mean

power, (2) the mean envelope voltage, and (3) the mean logarithm of

the envelope voltage. The mean power averaged over a period of

several minutes is the basic parameter and is expressed as an

effective antenna noise figure, Fa. Fa is defined as the noise power

available from an equivalent lossless antenna in db above ktb (the

thermal noise power available from a passive resistance) where

-23 k = Boltzman's constant (1. 38 x 10~" joules per degree Kelvin)

t = Absolute room temperature (taken as 288° K)

b = Bandwidth in cycles per second.

The mean voltage and mean logarithm are expressed as deviations, Vjj

and Li(j, respectively, in db below the mean power.

Measurements of these parameters were made with the National

Bureau of Standards Radio Noise Recorder, Model ARN-2, which has

an effective noise bandwidth of about 200 c/s and uses a standard

21. 751 vertical antenna. A fifteen -minute recording is made on each

of eight frequencies two at a time during each hour, and these fifteenminute samples are taken as representing the noise conditions for the

full hour. The month-hour medians, Fam, V^m, and X-«dm are

determined from these hourly values for each of the corresponding

parameters. Normally from twenty -five to thirty observations of the

mean power are obtained monthly for each hour of the day, and from

ten to fifteen observations of the voltage and. logarithm deviations.

When there are fewer than fifteen observations of the mean power, or

seven observations of the voltage and logarithm deviations, the

tabulated values are identified by an asterisk.
The upper and lower decile values of Fa are also reported in

the following tabulation to give an indication of the extent of the

variation of the noise power from day to day at a given time of day.

These are expressed in db above and below the month-hour median*

Fam* and designated by Dn and B|, respectively.

Time-block median values of noise are tabulated on a seasonal

basis, and are obtained by averaging all month-hour medians for the

season within a particular four-hour period of the day. The timeblock values conform to the seasonal -time -block values used in

C.C.I. R.' Report No. 65 (see attached references).

F in db is related to the rms field strength at the antenna by

the following equations

E = F +20 log, rt f^ - 65.5

n a °10 Mc

where

E = the equivalent vertically polarized ground wave rms noise

field strength in db above 1 (xv/meter for a 1 kc bandwidth.

f = the frequency in megacycles/second.

The nomogram given may be used for this conversion.

The values presented in the tables reflect the actual measured

radio noise; in some instances the atmospheric noise level may be

contaminated by man-made noise or station interference. The parameter that will first reflect any such contamination will be the

logarithmic parameter, L^. This contamination generally will cause

the value of L^ to be less than it would have been, had the recorded

value been only atmospheric noise. In determining the amplitudeprobability distribution from the three measured moments [ 10],

contaminated values of L^ may be found that will not give a solution of

the amplitude -probability distribution. When this occurs, it is

suggested that the measured value of L^ be ignored and the most

probable value of L^ from the curve on the graph of L^ vs. V^ be used

The most probable value has been determined as the best fit for the

integrated moments from over sixty measured amplitude -probabilitydistributions of uncontaminated atmospheric radio noise. The second

curve on the graph indicates the minimum value of L,$ that will give an

amplitude -probability distribution by the method in reference 10, and
can therefore be used to determine whether the measured value or the

most probable value of L^ for any value of V^ should be used.

Station clocks are set to a local standard time (LST) which is

taken from the time zone in which the station is located and is always

an integral number of hours different than universal or Greenwich

time (see table on page 5).

These preliminary data values are presented in order to

expedite dissemination of the data. Additional analyses, in which an

attempt is made to eliminate contaminated data, are presented in

other publications.

Stations in the recording network were operated by the

following agencies;

NBS - Bill, Wyoming; Boulder, Colorado; Byrd Station;

Front Royal, Virginia; Kekaha, Hawaii

Signal Corps, U. S. Army - Balboa, C. Z. ; Thule, Greenland

Postmaster General's Department (Australia) - Cook

Board of Telecommunications (Sweden) - Enkoping

DSIR (Great Britain) and University College Department of

Physics (Nigeria) - Ibadan

Ministry of Communications, Wireless Planning and

Co-ordination Organisation - New Delhi

Radio Research Laboratories (Japan) - Ohira

Telecommunications Research Laboratory (South Africa) - Pretoria

Institut Scientifique Che'rifien (Morocco) - Rabat

Institute Tecnologico de Aeronautica (Brazil) - Sao Jose* dos

Campos

Department of Scientific and Industrial Research (Great Britain)

- Singapore, Malaya

The assistance of the station operators and other personnel of

these agencies in obtaining the data contained in this report is gratefully acknowledged

.
4

The following publications contain additional information on

radio noise:

1. W. Q. Crichlow, D. F. Smith, R. N. Morton, and W. R. Corliss,

"Worldwide Radio Noise Levels Expected in the Frequency Band

10 Kilocycles to 100 Megacycles," NBS Circular 557, August 25, 1955.

2. "Report on Revision of Atmospheric Radio Noise Data," C. C. I. R.

Report No. 65, VHIth Plenary Assembly, Warsaw, 1956 (International

Radio Consultative Committee, Secretariat, Geneva, Switzerland).

3. A. D. Watt and E. L. Maxwell, "Measured Statistical

Characteristics of VLF Atmospheric Radio Noise," Proc, IRE, 45,1,

55 (1957).

4. W. Q. Crichlow, "Noise Investigation at VLF by the National

Bureau of Standards," Proc. IRE, 45, 6 , 778 (1957).

5. A. D. Watt and E. L. Maxwell, "Characteristics of Atmospheric

Noise from I to 100 kc, " Proc. IRE, 45,6 , 787 (1957).

6. F. F. Fulton, Jr., "The Effect of Receiver Bandwidth on

Amplitude Distribution of V. L. F. Atmospheric Noise," National

Bureau of Standards, VLF Symposium Paper 37, Boulder, Colorado,

1957.

7. H. E. Dinger, "Report on URSI Commission IV - Radio Noise of

Terrestrial Origin," Proc. IRE, 46,7 , 1366 (1958).

8. A. D. Watt, R. M. Coon, E. L. Maxwell, and R. W. Plush,

"Performance of Some Radio Systems in the Presence of Thermal and

Atmospheric Noise," Proc. IRE, 46, 12 , 1914 (1958).

9. W. L. Taylor and A. G. Jean, "Very-Low-Frequency Radiation

Spectra of Lightning Discharges," NBS J. of Research-D. Radio

Propagation, 63D,2, 199 (1959).

10. W. Q. Crichlow, C. J. Roubique, A. D. Spaulding, and

W. M. Beery, "Determination of the Amplitude -Probability

Distribution of Atmospheric Radio Noise from Statistical Moments,"

NBS J. Research-D. Radio Propagation, 64D,1 , 49 (I960).

11. Tatsuzo Obayashi, "Measured Frequency Spectra of Very-LowFrequency Atmospherics," NBS J. of Research-D. Radio Propagation,

64D,1, 41 (I960).
Data included in this report and the standard time for each

station are as follows:

Station Data

Time To Convert

Zone LST to GMT

(hours)

75 W +05

105 W +07

120 W +08

135 E -09

15 E -01

75 W +05

150 W + 10

135 E -09

30 E -02

GMT

45 W +03

105 E -07

Balboa

Boulder

Byrd Station

Cook

Enkoping

Front Royal

Kekaha

Ohira

Pretoria

Correction

Rabat

Sao Jose' dos Campos

Singapore

March April May 1961

March April May 1961

March April May 1961

March April May 1961

March April May 1961

March April May 1961

March April May 1961

March April May 1961

March April May 1961

sheets for Jan. , Feb. 1961

March April May 1961

March April May 1961

March April May 1961

Previous data from the NBS World-Wide Network have been

published in the following Technical Note 18 series:

18-1 July 1, 1957 - December 31, 1958

18-2 March, April, May 1959

18-3 June, July, August 1959

18-4 September, October, November 1959

18-5 December, January, February 1959-60

18-6 March, April, May I960

18-7 June, July, August I960

18-8 September, October, November I960

18-9 December, January, February 1960-61
MOST PROBABLE AND MINIMUM VALUES OF Ld VERSUS Vd

FOR ATMOSPHERIC RADIO NOISE

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

II

10

9

MOST PROBABLE VALUE OF L

d ^^

-MINIMUM VALUES OF Ld to r:i\/r APn ofthf FYPFPTFn form

12 3 5 6 7 8 9 10 II 12 13 14 15 16 17 18 19 20 V d

IN db BELOW F

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Luther H. Hodges, Secretary

NATIONAL BUREAU 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, U.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. 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. Digital Circuitry. Digital Systems. Analog Systems.

Applications Engineering.

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. Surface 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.

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. 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.
NBS