Variable frequency VLF signals in the magnetosphere Associated phenomena and plasma diagnostics

Details Variable frequency VLF signals in the magnetosphere Associated phenomena and plasma diagnostics Variable frequency VLF signals in the magnetosphere Associated phenomena and plasma diagnostics

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.1507c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Feb. 1, 1985, p. 1507-1521.

Computer Science

Sound

26

Earth Magnetosphere, Plasma Diagnostics, Radio Transmission, Space Plasmas, Very Low Frequencies, Cold Plasmas, High Temperature Plasmas, Plasma Resonance

Scientific paper

Coherent variable-frequency signals (ramps) extending from 1 to 8 kHz, injected into the magnetosphere from Siple Station, Antarctica (L=4.3), exhibit upper and lower cutoffs when received at the conjugate station, Roberval, Quebec. Ramp group delay measurements and ionospheric sounding data are used to determine the cold plasma density and L shell of the propagation path. Relationships among f, df/dt, and the 'phase equator' for gyroresonance are calculated using second-order resonance equations generalized to relativistic electrons. The concept thereby introduced is used to develop a diagnostic technique which, for an assumed g(alpha)(v exp -n) electron distribution, provides an estimate of the energy dependence n. Additional aspects of the magnetospheric response to ramp injection, such as emission triggering, curvature due to dispersion, and amplitude saturation, are discussed.

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