TY - JOUR
T1 - Convection dynamics and driving mechanism of a small substorm during dominantly IMF By+, Bz+ conditions
AU - Liang, Jun
AU - Sofko, G. J.
AU - Donovan, E. F.
AU - Watanabe, M.
AU - Greenwald, R. A.
PY - 2004/4/28
Y1 - 2004/4/28
N2 - Ground-based optical, magnetic and radar measurements detected a small substorm on October 9, 2000. Solar wind observations on GEOTAIL revealed a prolonged dominant Bz+ and steady By+ interplanetary magnetic field (IMF) prior to the substorm onset, except for a southward excursion at 0645-0655 UT, and a "square-wave" IMF Bx-By structure at 0727-0735 UT. We find that the IMF southward excursion led to the dayside convection enhancement and energy transport into the magnetosphere. When the dayside convection decreased, two pseudobreakups occurred as the consequence of the release of magnetospheric energy into the ionosphere. The substorm onset was associated with the IMF Bx-By structure in "directly driven" fashion. There was also a Stage-2 expansion which was internally driven within the magnetotail.
AB - Ground-based optical, magnetic and radar measurements detected a small substorm on October 9, 2000. Solar wind observations on GEOTAIL revealed a prolonged dominant Bz+ and steady By+ interplanetary magnetic field (IMF) prior to the substorm onset, except for a southward excursion at 0645-0655 UT, and a "square-wave" IMF Bx-By structure at 0727-0735 UT. We find that the IMF southward excursion led to the dayside convection enhancement and energy transport into the magnetosphere. When the dayside convection decreased, two pseudobreakups occurred as the consequence of the release of magnetospheric energy into the ionosphere. The substorm onset was associated with the IMF Bx-By structure in "directly driven" fashion. There was also a Stage-2 expansion which was internally driven within the magnetotail.
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U2 - 10.1029/2003GL018878
DO - 10.1029/2003GL018878
M3 - Article
AN - SCOPUS:3042753984
SN - 0094-8276
VL - 31
SP - L08803 1-5
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 8
ER -