Physics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.5828h&link_type=abstract
Journal of Geophysical Research, vol. 84, Oct. 1, 1979, p. 5828-5838.
Physics
3
Cold Plasmas, Earth Magnetosphere, Electrostatic Waves, Emission, Geomagnetism, Explorer 43 Satellite, Graphs (Charts), Magnetic Measurement, Tables (Data)
Scientific paper
A synoptic study of electric wave, magnetometer, and plasma data from Imp 6 has been carried out for times when banded electrostatic waves are observed between harmonics of the electron gyrofrequency in the earth's outer magnetosphere. Four separate classes of such waves have previously been identified by us. The spatial and temporal occurrences of waves in each class are summarized here, as are correlations of occurrence with geomagnetic activity. Most importantly, associations between the observations of waves of different classes and the relative portions of cold and hot electrons present at the position of the spacecraft are established. The cold to hot ratio varies in accordance with the predictions of our previous theoretical work, which models the emission as arising unstably from a hot loss cone distribution existing simultaneously with a cold isotropic electron component. Finally, evidence for the signature of the loss cone is sought in the plasma data.
Birmingham Thomas J.
Hones Edward W. Jr.
Hubbard Richard F.
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