Physics
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40.1309r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 40, Dec. 1978, p. 1309-1321.
Physics
1
Auroras, Electron Diffusion, Electron Precipitation, Magnetic Disturbances, Mathematical Models, Pitch (Inclination), Geomagnetism, Magnetic Variations
Scientific paper
The Coroniti-Kennel model (1970) of electron precipitation pulsations is reviewed and an additional restriction of differential relaxation time is introduced, making the model unstable under most conditions. The solution to the model was found to be nonlinear, and a very crude numerical solution has been attempted. The crude model has confirmed the idea that a 3-Hz modulation in pulsating auroral forms is related to short bursts of Coroniti-Kennel type strong pitch angle diffusion. Strong pitch angle diffusion will fill the loss cone and is therefore not consistent with a self-excited steady state diffusion. The model also indicates that the abnormal pitch angle distributions generated as a result of magnetic disturbances may survive for hundreds of seconds and act as a 'memory' on the field line, making it more susceptible to further disturbances.
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