Physics
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86...37p&link_type=abstract
Journal of Geophysical Research, vol. 86, Jan. 1, 1981, p. 37-53.
Physics
17
Ats 6, Energy Spectra, Magnetospheric Electron Density, Particle Precipitation, Very Low Frequencies, Wave Generation, Correlation, Electron Distribution, Plasmapause, Spectrograms, Synchronous Satellites, Time Response, Whistlers
Scientific paper
Correlations between wave and electron features in the magnetosphere are investigated on the basis of simultaneous satellite and ground-station measurements in an attempt to clarify the role of particles in the generation of VLF waves. Waves recorded at Siple, Antarctica were compared with low-energy electron data from the geosynchronous satellite ATS 6 while it was anchored near the outer edge of the nominal viewing area of the Siple VLF receiver. Two types of chorus events are observed which are readily distinguishable in frequency-time spectrograms. Those closely correlated with enhanced fluxes of greater than 5-keV electrons at geosynchronous altitude are considered to be generated outside the plasmapause, and have an upper cut-off frequency increasing in a manner consistent with the expected adiabatic motion of injected electrons in cyclotron resonance with the waves. Those with no apparent relation to particle injection are observed to occur inside the plasmapause and show evidence of being triggered by whistlers, power line radiation and echoing emissions.
Lin Chang-Shou
Park Chan-Gyung
Parks George K.
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