Rights statement: Copyright 2008 by the American Geophysical Union
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Simultaneous THEMIS in situ and auroral observations of a small substorm
AU - Donovan, E.
AU - Liu, W.
AU - Liang, J.
AU - Spanswick, E.
AU - Voronkov, I.
AU - Conners, M.
AU - Syrjasuo, M.
AU - Baker, G.
AU - Jackel, B.
AU - Trondsen, T.
AU - Greffen, M.
AU - Angelopoulos, V.
AU - Russell, C.T.
AU - Mende, S.B.
AU - Frey, H.U.
AU - Keiling, A.
AU - Carlson, C.W.
AU - McFadden, J.P.
AU - Glassmeier, K.-H.
AU - Auster, U.
AU - Hayashi, K.
AU - Sakaguchi, K.
AU - Shiokawa, K.
AU - Wild, J.A.
AU - Rae, I.J.
N1 - Copyright 2008 by the American Geophysical Union
PY - 2008/8/12
Y1 - 2008/8/12
N2 - 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.
AB - 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.
KW - THEMIS
KW - Substorms
UR - http://www.scopus.com/inward/record.url?scp=57049186342&partnerID=8YFLogxK
U2 - 10.1029/2008GL033794
DO - 10.1029/2008GL033794
M3 - Journal article
VL - 35
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 17
M1 - L17S18
ER -