Physics
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3108803l&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 8, CiteID L08803
Physics
3
Ionosphere: Auroral Ionosphere (2704), Ionosphere: Plasma Convection, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Storms And Substorms
Scientific paper
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.
Donovan Eric F.
Greenwald Ray A.
Liang Jun
Sofko George J.
Watanabe Makoto
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