Natural and man-made emissions at 1.0 to 5.6 MHz measured between 10 and 18 R sub E

Details Natural and man-made emissions at 1.0 to 5.6 MHz measured between 10 and 18 R sub E Natural and man-made emissions at 1.0 to 5.6 MHz measured between 10 and 18 R sub E

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989stin...9016116l&link_type=abstract

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Background Radiation, Emission Spectra, Solar Radio Bursts, Spectrum Analysis, Auroral Irradiation, Electric Discharges, Electromagnetic Measurement, Electromagnetic Noise

Scientific paper

A survey undertaken of the 1.0 to 5.6 MHz electric field spectrum measured at distances of 15 to 18 R(sub E) (100,000 to 120,000 km) from the Earth is described. Auroral Kilometric Radiation (AKR) emissions were taken into consideration in order to resolve interference sources. For the times of weak or absent AKR, the results of this survey may be summarized as follows: for local times of roughly 0800 to 1600 (dayside), a nearly constant level was recorded which at 1 to 3.2 MHz was equal to the galactic background level, and at 3.2 to 5.6 MHz was above the galactic background level and probably was due to spacecraft-generated noise. At other local times, the same nearly constant level was sometimes recorded, but frequently bursts of noise at 3 to 5.6 MHz were observed. These bursts seem more likely to represent ionospheric breakthrough of manmade radiation rather than natural emissions. A comparison with previous satellite observations implies that the terrestrial background level in this frequency range may have increased considerably between 1970 to 1985.

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