Computer Science – Sound
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983angeo...1..397j&link_type=abstract
Annales Geophysicae (ISSN 0755-0685), vol. 1, July-Oct. 1983, p. 397-410.
Computer Science
Sound
19
Auroras, Electron Precipitation, Pulsed Radiation, Equatorial Atmosphere, Extremely Low Frequencies, Modulation, Pitch (Inclination), Spatial Distribution, Wave Interaction
Scientific paper
New measurement using ground-based techniques, sounding-rockets and geostationary satellites show that pulsating aurora is almost certainly caused by a modulation of the precipitating electron beam. The modulation is probably imposed near the magnetic equator by an interaction with ELF waves which are observed to be modulated at the same frequency. The measured wave intensity is not strong enough to cause pulsations by variation of the rate of pitch angle diffusion so it is suggested that the pulsation is caused by a coherent interaction involving the generation of ELF chorus. The periodicity arises because the chorus is shut-off after approximately half a bounce period when the increased rate of precipitation removes most of the resonant electrons. The supply is then replenished by pitch angle diffusion.
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