THEMIS Observations of Double-onset Substorms and Their Association with IMF Variations

Details THEMIS Observations of Double-onset Substorms and Their Association with IMF Variations THEMIS Observations of Double-onset Substorms and Their Association with IMF Variations

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm23a..01c&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM23A-01

Physics

2704 Auroral Phenomena (2407), 2721 Field-Aligned Currents And Current Systems (2409), 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2784 Solar Wind/Magnetosphere Interactions, 2790 Substorms

Scientific paper

On 16 July 2008, two pairs of Pi2 pulsation bursts occurred successively and simultaneously at the ground- based observatory system for the THEMIS mission. The keogram at CHBG (L=3.90, corrected geomagnetic longitude 23.0) showed auroral activations at each Pi2 onset. The ground-based magnetometers and geosynchronous orbit sensed magnetic perturbations like the one affected by the formation of the substorm current wedge. The horizontal magnetic variation vectors, consisting of H and D components, had the vortex patterns like the ones induced by the upward and downward field-aligned currents during substorm times. These observations display two recurrent occurrences of double-onset substorms. Meanwhile the THEMIS-B probe at ~ XGSM 25 Re observed two same variation trends of the interplanetary magnetic field (IMF) with a low clock angle as those in the upstream region shifted to ~1 AU just in front of Earth

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