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8.5 MHz, DUSK, APRIL 1978

Figure 21b. Global distribution of radio noise observed at 8.5 MHz during
the dusk period of April_1978. Contours are receiver output
voltage (millivolts x 10°).


Strength (Volts)

Signal

10-2

TTT

io-3

10

tiiti

1

10°] l l l l l l l
1.2 3.0 5.0 70 9.0 11.0 13.0
Frequency (MHz)
Figure 2. Signal strength (in volts) as a function of frequency observed by

the DMSP satellite at 40.4°N, 265.8°E on July 27, 1977.


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MEAN NOISE LEVEL
Center Day: 1977/11/15

Delta Day: 15 days Time: Dawn
Center Frequency: 11.3 MHz Delta Frequency: 1.2 MHz
)300 20

300. 400 :
: : : 300°
300 : :

200 100

100
Figure 24, Global distribution of radio noise observed at 11.3 MHz during

the dawn period of November 1977 averaged over 1.2 MHz. Contours
are given in receiver output voltage (millivolts x 10°*).




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9.6 MHz, DUSK
L L

“

Figure 5b. Global distribution of radio noise observed at 9.6 MHz during

the dusk period of November 1977.
voltage (millivolts x 10°).

Contours are receiver output


ve

CENTER DAY: 1977/11/14 CENTER DAY: 1977/11/15 CENTER DAY: 1977/11/16 CENTER DAY: 1977/11/17
TOT 4 Tot T TT TI4
20 4 20- 4 20- 7 20- 4
: z : g *”
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g g g é
1 1 1
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3 st 4 3 sof 4S sof 4 8 sob (° 4
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bovis T7 it biti Trt iit f bitiiiriiiiig
40 60-80) 100-120 140160 40 60 «80 «100 120 140 160 ito" ro 7 160 40 60) 80 100 120 40160
East Longitude - Degrees East Longitude - Degrees cmt connyuse = Degrees East Longitude - Degrees
CENTER DAY: 1977/11/18 CENTER DAY: 1977/1W/19 CENTER DAY: 1977/11/20 CENTER DAY: 1977/11/21
Tt Tot a T Tt 1
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3 3 40 3 40 40 3
& 30 | 530} 4 30h 4 Bak 40 |
a 3 4 3 40
1 1 7 1
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2 2 60 2 2
5 50) 5 50- 4 5 50- 3 50- 7
8 60 - 8 60 4 8 60- q 8 60- 4
Lit a boititipii im biitig boidiriis f
40 60 «80 «100 120 140 160 40 60 80 «(100 120 140160 40 60 «80 100 120 140 160 40 60 «80 100. 120 140 160
East Longitude - Degrees East Longitude - Degrees East Longitude - Degrees East Longitude ~ Degrees
CENTER DAY: 1977/11/22 CENTER DAY: 1977/11/23
ot a
20 Sa 4
& 30- 4 B30 4
F adi ° ° :
Center Day: Varies as indicated & 4- 3a ITM~ 4 Center Frequency: 11.5 MHz
= 40 2 40
Delta Day: 5 days S50 + 3 s0- & 4 Delta Frequency: 0.1 MHz
Time: Dusk 5 a 4 Bar 7 Mean Noise Values
biditriiiviiig bitititiiiity
40 60) 80 100 120 140160 40 60 80 «100 120 «140 160

Figure 19.

during the times indicated.

East Longitude - Degrees

East Longitude - Degrees

Contours of the receiver output voltage observed at 11.5 MHz

Contours are given in millivolts x 107°


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Behavior of the HF radio environment at local dawn above Eurasia,
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el

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800
400 400
800
H 800
200
406 T abo 800
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200

11.8 MHz, DAWN

=

Figure 4a. Global distribution of radio noise observed at 11.8 MHz during

the dawn period of November 1977. Contours are receiver output
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6L

8.5 MHz, DAWN

100

50

Figure 7a. Global distribution of radio noise observed at 8.5 MHz during

the dawn period of November 1977.
voltage (millivolts x 1073).

Contours are receiver output



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800
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400
200
200
50
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9.6 MHz, DAWN

Figure 5a. Global distribution of radio noise observed at 9.6 MHz during
the dawn period of November 1977. Contours are receiver output
voltage (millivolts x 10 °).



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Geographic Location

Table 1. Values of HF Receiver Counts for 8.5 and 11.7 MHz Averaged
Over 5, 10, and 15 Day Intervals

DAWN
8.5 MHz 8.5 MHz 8.5 MHz 11.7 MHz 11.7 MHz 11.7 MHz
5 Day 10 Day 15 Day 5 Day 10 Day 15 Day
47°.N, 47° E 64 +1 55 +8 | 65+ 16 123 +1 124 + 3 124 +2
47°.N, 277° E 44+ 4 44+3 | 45+ 3 101 +7 104 +7 102 +7
12°N, 2° E 37 +1 37 +1 | 35+ 2 57 +1 57 +1 56 +1
22° S, 292° E 38 +2 38 +2 | 38+ 2 57 +1 57 +1 56 +2
47° S, 87° E 39 +7 39+2 | 39+ 2 57 +1 55 +1 56 +2

DUSK
8.5 MHz 8.5 MHz 8.5 MHz 11.7 MHz 11.7 MHz 11.7 MHz
5 Day 10 Day 15 Day 5 Day 10 Day 15 Day
47°. N, 47° E 63 +1 63+1 | 63+ 1 123 +1 123 +1 123 +1
47°.N, 277° E 50+ 4 49+3 | 49+ 3 105 +2 98 +7 98 +7
12° N, 2° E 3442 36 +3 36+ 3 55 +1 56 +2 56 +2
22° S, 292° E 36 + 3 36+ 4 36+ 3 57 +1 57 +1 56 + 1
47° S, 87° E 37 +2 38 +2 | 38+ 3 65 +1 6442 62 + 3



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Figure 11. Behavior of the HF radio environment at local dawn above Eurasia,

North America, and Australia for frequencies of 8.0, 8.5, 9.0, and
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100
100

400 400

U 200 0
ww 100
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12.5 MHz, DUSK

Figure 8b. Global distribution of radio noise observed at 12.5 MHz during
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Ps

Figure 3.

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the dawn period of September-November 1977. Contours are
receiver output voltage (millivolts x 10°).



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.

6.1 MHz DAWN

Figure 6a. Global distribution of radio noise observed at 6.1 MHz during
the dawn period of November 1977. Contours are receiver output
voltage (millivolts x 10°).


NTIA-REPORT-80-33

HF Radio Noise in the
Topside lonosphere

C.M. Rush
R.K. Rosich
C. Mellecker

U.S. DEPARTMENT OF COMMERCE
Philip M. Klutznick, Secretary

Henry Geller, Assistant Secretary
for Communications and Information

February 1980


Ov

190

12.5 MHz, DUSK, APRIL 1978

100

50

Figure 22b. Global distribution of radio noise observed at 12.5 MHz during
the dusk period of April_1978. Contours are receiver output
voltage (millivolts x 10°°).


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a 200

\ a

800

200
400

490 APRIL

Figure 20b.

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the dusk period of April_1978. Contours are receiver output
voltage (millivolts x 10°).


v2

TO°N
60
50
40

30

T0°N
60
50
40)

30

! L d. L 1 L

130 160 °E 100 = 130 160 °E 100

Figure 10. Behavior of the HF radio environment at local dawn above Eurasia,
North America, and Australia for frequencies of 6.0, 6.5, 7.0, and

7.5 MHz during the period September-November 1977. Contours are
receiver output voltage (millivolts x 107).

i
130 160 °E 100

1 1

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Figure 16.

| I nan | | 1
160 °E 100130160 °E 100 130 160°°E 100 | 130 16
Behavior of the HF radio environment at local dusk above Eurasia,
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receiver output voltage (millivolts x 10°).

0°E



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Figure 6b. Global distribution of radio noise observed at 6.1 MHz during
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40 4 40
50 y ‘d 1+ A 141 id 50
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Figure 12. Behavior of the HF radio environment at local dawn above Eurasia,
North America, and Australia for frequencies of 10.0, 10.5, 11.0,
and 11.5 MHz during the period September-November 1977. Contours

are receiver output voltage (millivolts x 10°7).


GE

\ oy
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400
400
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200 #90
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Figure 20a. Global distribution of radio noise observed at 11.8 MHz during
the dawn period of April_1978. Contours are receiver output
voltage (millivolts x 107°).


4

12.5 MHz, DAWN

100 100

Figure 8a. Global distribution of radio noise observed at 12.5 MHz during

the dawn period of November 1977.
voltage (millivolts x 1073).

Contours are receiver output


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Center Day: 1977/11/15

Delta Day: 15 days Time: Dawn
Center Frequency: 11.3 MHz Delta Frequency: O.1 MHz
300
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100

Ln 200,
100

Figure 23. Global distribution of radio noise observed at 11.3 MHz during

the dawn period of November 1977 averaged over 100 KHz.
are given in receiver output voltage (millivolts x 107°).

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