Physics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.3635m&link_type=abstract
Journal of Geophysical Research, vol. 86, May 1, 1981, p. 3635-3639.
Physics
7
Bandwidth, Equatorial Atmosphere, Magnetic Disturbances, Magnetospheric Instability, Very Low Frequencies, Whistlers, Emission Spectra, Explorer 45 Satellite, Spectral Energy Distribution
Scientific paper
The broadening of the whistler mode VLF emission band has frequently been observed by the equatorially orbiting S3-A (Explorer 45) satellite outside the midnight sector of the plasmasphere, during periods of geomagnetic disturbance. Prior to the broadening, the band of this emission is narrow with a sharp gap at the half electron gyrofrequency. The gradual broadening of the emission band on the low-frequency side is associated with the simultaneously observed spreading of the anisotropy of the ring current electrons to higher and wider energy ranges. Using the modeled distribution function, the linear growth rates of the cyclotron instability are calculated numerically. The results suggest that broadening of the VLF emission band near the plasmasphere can be caused by spreading of the ring current electron anisotropy toward higher energies.
Lin Chang-Shou
Maeda Kengo
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