Global Magnetospheric Response to an Interplanetary Shock: THEMIS Observations

Details Global Magnetospheric Response to an Interplanetary Shock: THEMIS Observations Global Magnetospheric Response to an Interplanetary Shock: THEMIS Observations

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm33b..02z&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM33B-02

Physics

[2768] Magnetospheric Physics / Plasmasphere, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

We investigate the global response of the geospace plasma environment to an interplanetary shock at ~0224 UT on May 28, 2008 from multiple THEMIS spacecraft observations in the magnetosheath (THEMIS B and C), the mid-afternoon (THEMIS A), and the dusk magnetosphere (THEMIS D and E). The interaction of the transmitted interplanetary shock with the magnetosphere has global effects. Consequently, it can affect geospace plasma significantly. After interacting with the bow shock, the interplanetary shock transmitted a fast shock and a discontinuity which propagated through the magnetosheath toward the Earth at speeds of 300 km/s and 137 km/s respectively. THEMIS A observations indicate that the interplanetary shock changed the properties of the plasmaspheric plume significantly. The plasmaspheric plume density increased rapidly from 10 to 100 cm-3 in 4 min and the ion distribution changed from an isotropic to a strongly anisotropic distribution. Electromagnetic ion cyclotron (EMIC) waves observed by THEMIS A are most likely excited by the anisotropic ion distributions caused by the interplanetary shock impact. We show that the arrival of the interplanetary shock energize the plue population, resulting in strongly anisotropic particle distributions. THEMIS A, but not D or E, observed a plasmaspheric plume in the dayside magnetosphere. Multiple spacecraft observations indicate that the dawn-side edge of the plasmaspheric plume was located between THEMIS A and D (or E).

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