A possible common nature of equatorial half-gyrofrequency VLF emissions and discrete plasmaspheric emissions

Details A possible common nature of equatorial half-gyrofrequency VLF emissions and discrete plasmaspheric emissions A possible common nature of equatorial half-gyrofrequency VLF emissions and discrete plasmaspheric emissions

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..755b&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 8, Nov. 1990, p. 755-763.

Physics

Optics

9

Equatorial Atmosphere, Gyrofrequency, Plasma Radiation, Plasmasphere, Very Low Frequencies, Frequency Stability, Geometrical Optics, Geos 2 Satellite, Wave Propagation, Whistlers

Scientific paper

An attempt is made to connect VLF emissions in a frequency band just above one half the electron gyrofrequency observed in the magnetospheric equatorial region beyond the plasmapause and the discrete plasmaspheric emissions with a lower cutoff frequency close to one quarter of the equatorial electron gyrofrequency, observed on low-altitude satellites within the plasmasphere. Both kinds of emissions might have a common source in the equatorial region. After their generation at the equator in the quasi-electrostatic mode, the emissions are subjected to a substantial change of their normalized frequency due to the decrease of their L-shell while propagating toward the earth. The instability caused by the combined effects of temperature anisotropy and the loss cone in the energetic electron distribution is analyzed, and wave propagation in the quasi-resonance mode (i.e., the wave normal angle close to the resonance cone) is studied in detail. This forms the basis for the explanation of the main characteristic features of the discrete plasmaspheric emissions.

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