Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.5961s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, June 1, 1987, p. 5961-5968. Research supported by the Ministry of Env
Physics
9
Atmospheric Attenuation, Electron Precipitation, Ionospheric Propagation, Riometers, Auroral Zones, Electromagnetic Absorption, Electron Scattering, Incident Radiation, Vertical Distribution
Scientific paper
The absorption of cosmic radio noise at 20, 30, and 51.4 MHz is calculated by transforming the Berger et al. (1974) altitude profiles for energy deposition in the atmosphere by electrons and electron-produced X-rays into electron density profiles. It is found that (1) the absorption of a wide angle riometer antenna is about 1.4 times larger than zenithal absorption, that (2) a relationship exists between the precipitation electron flux N and riometer absorption, and that (3) the spectral index n=2 for all three e-folding energies if the precipitation is uniform over the field of view of the antenna, but attains values well below 2 for the higher e-folding energies only if the effective electron collision frequency is enhanced by hyperthermal electrons.
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