High-energy electron injection associated with substorm dipolarization: Models and comparison with riometer observations

Details High-energy electron injection associated with substorm dipolarization: Models and comparison with riometer observations High-energy electron injection associated with substorm dipolarization: Models and comparison with riometer observations

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51b1404l&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM51B-1404

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2716 Energetic Particles: Precipitating, 2730 Magnetosphere: Inner, 2790 Substorms, 2794 Instruments And Techniques

Scientific paper

Energetic particle injection has long been recognized as a common signature of magnetospheric substorms. In this study the injection process is modeled via the Fokker-Planck equation wherein the convective transport terms are associated with adiabatic changes imposed on the distribution of high-energy electrons by a rapid- varying magnetic fields simulating the substorm dipolarization. The model results are compared with the riometer observations of ionospheric absorption of cosmic radio noises, which is known to respond to the precipitation of magnetospheric electrons with energy >30 keV. In particular, our model is capable of reproducing the riometer dispersionless injection event defined by Spanswick [2006]. The interrelationship between the riometer injections and observations from other instruments prescribed by our theoretic framework is discussed. We suggest the possibility that the riometer data become one of the most accurate methods to pinpoint and quantify the magnetospheric dynamics underlying a substorm.

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