Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39.1069s&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 39, July 1991, p. 1069-1079.
Physics
24
Ionospheric Electron Density, Magnetic Storms, Plasmasphere, Whistlers, Ionospheric Propagation, Magnetospheric Instability, Plasmapause, Ring Currents, Wave-Particle Interactions
Scientific paper
Whistler mode group delays observed at Faraday, Antarctica (65 degS, 64 degW) decrease after the onset of magnetic storms, and slowly recover to normal levels in 1 or 2 days. This is interpreted as a decrease (typically of 50 percent) and recovery of the plasmaspheric electron density at L = 2.5. Within 1 day of the main phase of storms with Kp(max) between 6 and 8, the number of observed whistler ducts increases by a factor of 2 or 3, recovering in a few days. During the most intense storms (Kp greater than 8), the duct number decreases. The frequency of occurrence of observed whistler mode signals increases during storms, due probably to enhanced ionospheric propagation of the signals; the storm time dependence implies that there is no link with the apparent increase in duct numbers. The amplitudes of received whistler mode signals are increased by up to a factor of 10 during storms: this is interpreted in terms of magnetospheric amplification through wave-particle interactions.
Clilverd Mark A.
Smith Anthony J.
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