THEMIS observations of substorms on 26 February 2008 initiated by magnetotail reconnection

Details THEMIS observations of substorms on 26 February 2008 initiated by magnetotail reconnection THEMIS observations of substorms on 26 February 2008 initiated by magnetotail reconnection

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11502212p&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A2, CiteID A02212

Physics

14

Magnetospheric Physics: Substorms, Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetic Reconnection (7526, 7835), Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Plasma Sheet

Scientific paper

On 26 February 2008, the THEMIS satellites observed two substorms that occurred at about 0405 and 0455 UT. Angelopoulos et al. (2008) made a comprehensive study of the second event. In this paper we display detailed features of the two substorms with emphasis on the first. In both substorms, a distinct auroral intensification occurred during the earliest stage of onset, about 1 to 2 min after midtail reconnection began. This initial intensification was weak and localized and thus had the signatures of a pseudobreakup. In both substorms, a second, major intensification occurred next in the substorm onset sequence, followed by rapid and extensive poleward expansion. This second intensification had the features of the major expansion onset and was nearly coincident with observations of earthward flows and magnetic dipolarization in the near-Earth tail. During the growth phase of the two substorms, open magnetic flux accumulated in the polar cap; in the expansion/recovery phase the polar cap open flux was quickly reduced. These observations are in agreement with the assertion that tail reconnection initiates the initial pseudobreakup and the ensuing major expansion and releases and transports energy to eventually cause near-Earth dipolarization and the expansion phase onset of these two substorms.

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