The Influence of Substorm-Induced Electric Fields on the Build-up of Particle Radiation during Geospace Magnetic Storms

Details The Influence of Substorm-Induced Electric Fields on the Build-up of Particle Radiation during Geospace Magnetic Storms The Influence of Substorm-Induced Electric Fields on the Build-up of Particle Radiation during Geospace Magnetic Storms

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..848..168m&link_type=abstract

RECENT ADVANCES IN ASTRONOMY AND ASTROPHYSICS: 7th International Conference of the Hellenic Astronomical Society. AIP Conferenc

Astronomy and Astrophysics

Astrophysics

Magnetic Storms, Substorms, Electric Fields, Field-Aligned Currents And Current Systems, And Ring Currents

Scientific paper

The enhanced magnetospheric convection electric field and the substorm-induced electric fields are the drivers of plasma acceleration during geospace magnetic storms. The relative influence of the two drivers on the development of the storm-time ring current is the topic of this study. We use a three-dimensional dynamic ion-tracing model, to construct maps of the temporal and spatial variations of ion- number densities in the inner magnetosphere. Outflowing ionospheric oxygen ions and protons are traced under two distinct scenarios: in the first case, we follow their transport and acceleration under the influence of a large convection electric field only. In the second case, we add an impulsive electric field due to magnetic field dipolarization, as observed by spacecrafts during substorm expansion. Our aim is to evaluate the contribution of substorms to the build-up of particle radiation in the inner magnetosphere.

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