Does the braking of the fast plasma flow trigger a substorm?: A study of the August 14, 1996, event

Details Does the braking of the fast plasma flow trigger a substorm?: A study of the August 14, 1996, event Does the braking of the fast plasma flow trigger a substorm?: A study of the August 14, 1996, event

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29o..16o&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 15, pp. 16-1, CiteID 1721, DOI 10.1029/2001GL013785

Physics

9

Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Current Systems (2409), Magnetospheric Physics: Plasma Sheet

Scientific paper

In a substorm event of August 14, 1996, the Geotail satellite was at XGSM ~ -10 RE aligned with the GOES 8 satellite in the X direction in the premidnight sector. Two Pi2 onsets were identified. Whereas the first onset was associated with a pseudobreakup, an auroral bulge developed following the second onset. At the pseudobreakup Geotail observed a fast (>900 km/s) plasma flow along with dipolarization, but the geosynchronous magnetic field became stretched subsequently. In contrast, for the main onset, the magnetic field dipolarized at GOES 8, although the associated total (time-integrated) transport of magnetic flux at Geotail was no stronger than that for the pseudobreakup. It is suggested that the braking of the fast flow does not necessarily cause tail current disruption in a large scale, and there is an additional (or alternative) condition to suffice for an initial brightening to develop to a global substorm.

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