Simultaneous THEMIS in situ and auroral observations of a small substorm

Donovan, E. and Liu, W. and Liang, J. and Spanswick, E. and Voronkov, I. and Conners, M. and Syrjasuo, M. and Baker, G. and Jackel, B. and Trondsen, T. and Greffen, M. and Angelopoulos, V. and Russell, C.T. and Mende, S.B. and Frey, H.U. and Keiling, A. and Carlson, C.W. and McFadden, J.P. and Glassmeier, K.-H. and Auster, U. and Hayashi, K. and Sakaguchi, K. and Shiokawa, K. and Wild, J.A. and Rae, I.J. (2008) Simultaneous THEMIS in situ and auroral observations of a small substorm. Geophysical Research Letters, 35 (17): L17S18. ISSN 0094-8276

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We present ground-based and in situ observations from March 13, 2007. The THEMIS satellites were in the evening sector conjugate to THEMIS ground-based imagers. At ∼0507 UT there was an optical onset on inner CPS field lines. This involved near-simultaneous brightening of 1 MLT hour longitudinal segment of the onset arc. The part of the arc that brightened was that closest to the equatorward boundary of the diffuse (proton) aurora. Within one minute, a dipolarization front moved across four THEMIS satellites. Based on their locations, the order in which they detected the dipolarization front, and the auroral evolution, we assert that the expansion phase began earthward of the four satellites and evolved radially outwards. We conclude that this onset occurred in an azimuthally localized region of highly stretched field lines.

Item Type:
Journal Article
Journal or Publication Title:
Geophysical Research Letters
Additional Information:
Copyright 2008 by the American Geophysical Union
Uncontrolled Keywords:
?? themissubstorms physicsgeophysicsearth and planetary sciences(all)qc physics ??
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Deposited On:
04 Nov 2008 18:49
Last Modified:
25 Apr 2024 00:42