Atmospheric Noise Levels at Radio Frequencies near Darwin, Australia

1950 ◽  
Vol 3 (3) ◽  
pp. 409
Author(s):  
DE Yabsley
Keyword(s):  
Western Australia ◽  
Average Level ◽  
Radio Noise ◽  
Noise Levels ◽  
Atmospheric Noise ◽  
Continuous Record ◽  
Atmospheric Radio ◽  
Radio Frequencies ◽  
North Western ◽  
Atmospheric Radio Noise

Between August 25, 1944, and October 31, 1945, a practically continuous record of the average level of atmospheric radio noise at a frequency of 1.93 Mc/s. was obtained near Darwin, in north-western Australia. A few measurements were also made at a frequency of 5.9 Mc/s. The noise-measuring programme is described and the results obtained are presented graphically.

scholarly journals Spaceborne observations of radio noise from 0.7 to 7.0 MHz and their dependence on the terrestrial environment

1965 ◽  
Vol 23 ◽  
pp. 309-317
Author(s):  
G. R. Huguenin ◽  
M. D. Papagiannis
Keyword(s):  
Cosmic Radio ◽  
Radio Noise ◽  
Noise Levels ◽  
Terrestrial Environment ◽  
Long Wavelength ◽  
Atmospheric Radio ◽  
Van Allen Belts ◽  
Radio Background ◽  
Very High ◽  
Atmospheric Radio Noise

Observations of long-wavelength (λ > 30 m) radio radiation in space are reported and analyzed in the framework of the terrestrial environnement.Measurements at low altitudes (~ 300 km) at the frequencies of 4.0 and 7.0 MHz have revealed the existence of very high radio noise levels during the night and on certain occasions during the day. These strong signals were at least 50 db higher than the expected cosmic background and are attributed to man-made and atmospheric radio noise.Measurements at high altitudes (3000–11000 km) at the frequencies of 2.2 and 0.7 MHz have produced a flux value at 2.2 MHz in agreement with the expected cosmic radio background, but the flux value obtained at 0.7 MHz is approximately 15 db higher than the anticipated flux from cosmic sources. Harmonic gyroradiation from the artificial and the outer Van Allen belts might be the cause of the high radio flux observed at 0.7 MHz.

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