Highly periodic activations observed by THEMIS prior to substorm onset

Details Highly periodic activations observed by THEMIS prior to substorm onset Highly periodic activations observed by THEMIS prior to substorm onset

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm21c..05k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM21C-05

Physics

2740 Magnetospheric Configuration And Dynamics, 2760 Plasma Convection (2463), 2764 Plasma Sheet, 2788 Magnetic Storms And Substorms (7954), 2790 Substorms

Scientific paper

On March 24, 2007, the THEMIS spacecraft observed near the dusk flank several 10 minute quasi-periodic flow and magnetic field oscillations followed by the onset of a strong substorm. The IMF was strongly southward during the event, although the start of the oscillations appeared to be associated with a brief but significant northward turning. Each of the oscillations was accompanied by an auroral intensification, an energetic particle injection, and ground Pi2 pulsations. We first characterize the timing of the events observed by the 5 THEMIS spacecraft, ground imagers and magnetometers, and geosynchronous spacecraft. We then examine whether the quasi-periodic activations were manifestations of an instability that lead to the onset of a global substorm.

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