Auroral electron precipitation when the trapped radiation region collapsed during the main phase of the geomagnetic storm of May 15, 2005 |
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| Authors: | L V Tverskaya B V Marjin M V Teltsov T A Ivanova |
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| Institution: | (1) The Aerospace Corporation, 92957, Los Angeles, CA 90009, USA |
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| Abstract: | The simultaneous measurements of the boundary of the trapped radiation region, where auroral electrons precipitate, on the
Meteor-3M satellite (the circular polar orbit at an altitude of ∼1000 km) and the westward electrojet dynamics during the
main phase of a strong (Dst = −263 nT) magnetic storm that occurred on May 15, 2005, are analyzed. At the end of the first
hour of the storm main phase, the nightside boundary of the trapped radiation region and the peak of the precipitating electron
fluxes with a energies of ∼1 keV shifted toward the Earth to L ∼ 3. The westward electrojet center approached the same L shell.
Near the boundary of the trapped radiation region, the auroral electron spectrum had the shape of typical inverted V. The
differential spectrum maximum shifted to an energy of ∼100 eV, when the latitude decreased by ∼1°. The nightside boundary
of the trapped radiation region, the electron precipitation equatorward boundary, and the westward electrojet center are compared
with the known empirical dependences of the position of these structures on the Dst variation amplitude. |
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