THEMIS 26-Feb-08 substorm expansion onset intensified by northward turning of IMF

Details THEMIS 26-Feb-08 substorm expansion onset intensified by northward turning of IMF THEMIS 26-Feb-08 substorm expansion onset intensified by northward turning of IMF

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43a1721k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM43A-1721

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2790 Substorms

Scientific paper

We propose to interpret the THEMIS 26-Feb-08 events as substorm expansion onset intensified by northward turning of IMF. Auroral arcs in the oval including the substorm onset arcs can be produced by enhanced convection driven by the distant-tail X-line during the growth phase. Dipolarization at the expansion onset of the THEMIS substorm events are intensified by the northward turning of IMF. If the dipolarization-induced thinning is intense enough to produce the NEXL (near-Earth X-line), the expanding auroral bulge will be driven by the NEXL during the expansion phase. Otherwise the expansion onset terminates in a pseudo breakup. The one-on-one correspondence between the causal sequence of the substorm events of the model and the timing sequence of the THEMIS substorm events speaks well for the model.

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