Magnetospheric conditions at the time of enhanced wave-particle interactions near the plasmapause

Details Magnetospheric conditions at the time of enhanced wave-particle interactions near the plasmapause Magnetospheric conditions at the time of enhanced wave-particle interactions near the plasmapause

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2175f&link_type=abstract

Journal of Geophysical Research, vol. 81, May 1, 1976, p. 2175-2182.

Physics

2

Auroral Zones, Earth Magnetosphere, Electron Precipitation, Magnetic Storms, Plasmapause, Atmospheric Models, Cold Plasmas, Correlation, Cyclotron Resonance, Magnetic Signatures, Universal Time, Very Low Frequencies, X Ray Density Measurement

Scientific paper

A sequence of substorm intensifications occurring at 0700, 0820, 0850, and 0925 UT on Jan. 2, 1971 in the American sector in the vicinity of Siple Station is examined. Analysis of the magnetic field, electron, and X ray data for the sequence showed that substorm activity began in the morning sector of the auroral oval and progressed 'jumpwise' westward to premidnight longitudes. Energetic electron injection into subauroral L shells during the sequence of substorm intensifications resulted in enhanced wave-particle interactions and electron precipitation near the morning side plasmapause. The onset and the temporal and spectral features of the electron precipitation at L = 4 near dawn can be related to these electron injections when cross-L inward convection and azimuthal drift are considered. It is suggested that injected electrons penetrated at least to the region just outside the plasmapause and that simultaneous electron injection and VLF wave generation were associated with the onset of cyclotron resonance interactions following the arrival of the electrons on the field line over Siple Station.

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