Properties of spike events in auroral radio absorption

Details Properties of spike events in auroral radio absorption Properties of spike events in auroral radio absorption

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.4245h&link_type=abstract

Journal of Geophysical Research, vol. 84, Aug. 1, 1979, p. 4245-4250. Research supported by the Science Research Council of Eng

Physics

5

Auroral Absorption, Ionospheric Propagation, Night Sky, Radio Attenuation, Electron Precipitation, Ground Stations, Riometers, Satellite Observation

Scientific paper

This paper considers the spatial extent and the spectral index of spike events in auroral radio absorption observed with riometers. On the evidence of narrow- and wide-beam observations at more than one radio frequency and satellite particle data, it is shown that the typical spike event extends for only tens of kilometers in the ionosphere, compared with several hundred kilometers for auroral absorption in general. The spectral index is found to be close to 2.0, as for the general absorption, implying that the spike absorption is not produced at an unusually low altitude. It is concluded that for spike events the electron precipitation is very intense, is not unusually energetic, and is spatially restricted.

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