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Title:
Response of the inner magnetosphere and the plasma sheet to a sudden impulse
Authors:
Keika, K.; Nakamura, R.; Baumjohann, W.; Runov, A.; Takada, T.; Volwerk, M.; Zhang, T. L.; Klecker, B.; Lucek, E. A.; Carr, C.; Rème, H.; Dandouras, I.; André, M.; Frey, H.
Affiliation:
AA(Space Research Institute, Austrian Academy of Sciences, Graz, Austria); AB(Space Research Institute, Austrian Academy of Sciences, Graz, Austria); AC(Space Research Institute, Austrian Academy of Sciences, Graz, Austria); AD(Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California, USA); AE(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan); AF(Max Planck Institute for Extraterrestrial Physics, Garching, Germany); AG(Space Research Institute, Austrian Academy of Sciences, Graz, Austria); AH(Max Planck Institute for Extraterrestrial Physics, Garching, Germany); AI(Imperial College, London, UK); AJ(Imperial College, London, UK); AK(Centre d'Etude Spatiale des Rayonnements, CNRS/UPS, Toulouse, France); AL(Centre d'Etude Spatiale des Rayonnements, CNRS/UPS, Toulouse, France); AM(Institutet för Rymdfysik, Swedish Institute of Space Physics, Uppsala, Sweden); AN(Space Science Laboratory, University of California, Berkeley, California, USA)
Publication:
Journal of Geophysical Research, Volume 113, Issue A7, CiteID A07S35 (JGRA Homepage)
Publication Date:
06/2008
Origin:
AGU
AGU Keywords:
Magnetospheric Physics: Solar wind/magnetosphere interactions, Magnetospheric Physics: Plasma sheet, Magnetospheric Physics: Magnetospheric configuration and dynamics, Magnetospheric Physics: Electric fields (2411), Magnetospheric Physics: Magnetosphere: inner
DOI:
10.1029/2007JA012763
Bibliographic Code:
2008JGRA..11307S35K

Abstract

The passage of an interplanetary shock caused a sudden compression of the magnetosphere between 0900 UT and 0915 UT on 24 August 2005. An estimate of the shock normal from solar wind data obtained by Geotail upstream of the bow shock indicates symmetric compression with respect to the noon-midnight meridian. Compression-related disturbances of the magnetic and electric field and plasma motion were observed by Double Star Program (DSP) Tan Ce 1 (TC1) and Tan Ce 2 (TC2) in the inner magnetosphere and by the Cluster spacecraft in the dawnside plasma sheet. DSP/TC1 and TC2 observations suggest that the disturbances in the inner magnetosphere are propagating from the dayside magnetopause. Cluster S/C 4 observations indicate that the front normal of the disturbances in the dawnside plasma sheet is $\phi$ ~ 180° at 0902:50 UT and $\phi$ = 107° at 0904:34 UT, where $\phi$ is the longitude in GSM coordinates, if we assume that the measured electric field is on the front plane and the normal lies on the X-Y plane. The timing analysis applied to magnetic field data from the four Cluster spacecraft independently gives a front normal, which is calculated to be $\phi$ = 131° at about 0904:20 UT. Shock-associated magnetic and electric field disturbances propagating from both the dayside and flank magnetopauses are detected in the plasma sheet; the latter makes the dominant contribution. Substorms are, however, not triggered at the passage of the disturbances.
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