Abstract We report a detailed case study of substorm on January 6, 2008 in the interval 13–15 UT using data from four THEMIS satellites located in the morning sector magnetosphere eastward the onset location. The substorm of interest presents the ground-based magnetic disturbance consisted from the large-scale pulsations (4–5min) superposed on the substorm bay. One can distinguish at least two significant activations at different spatial regions. First activation, which follow after a short-living burst of the IMF B z, developed westward of second one, which was sequent after the northward turning IMF B z. We show the existence of fast magnetosonic mode after second activation. This mode was observed at 7.5 RE in the morning sector at region of transition from dipole to tail-like configuration of the magnetic field. The increase of z-component of the magnetic field observed in magnetosphere during the non-diamagnetic structure is interpreted as an enhancement of westward ring (or partial-ring) current at closer to Earth distances. The appearance of the sub-keV plasma at ∼5.8 RE (used as a tracer of substorm injection) supports this supposition.
Particle injections observed at the morning sector as a response to IMF turning
Advances in Space Research ; 56 , 10 ; 2106-2116
2015-08-20
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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