Ground and satellite observations of substorm onset arcs

Details Ground and satellite observations of substorm onset arcs Ground and satellite observations of substorm onset arcs

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11012225s&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A12, CiteID A12225

Physics

2

Magnetospheric Physics: Substorms, Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Energetic Particles: Precipitating, Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Magnetospheric Physics: Magnetospheric Configuration And Dynamics

Scientific paper

Auroral features and associated particles and fields are investigated for a sequence of substorm onsets observed at ~1900 MLT on 24 October 2000. During a 30-min interval at 1020-1050 UT, we identified three Pi 2 wave packets with positive H enhancements at midlatitudes and associated auroral brightenings in auroral images obtained by a ground all-sky camera and the IMAGE FUV imager. The DMSP F15 satellite crossed brightening arcs during the third Pi 2 pulsation in the field-of-view of the ground camera at Tixie (66.0° MLAT), Russia. The crossing was 1-2 hours duskside of the main onset local time. The brightening arcs were located in the region 1 upward field-aligned current system. The most equatorward arc, which brightened just after the second Pi 2 pulsation, was at the equatorward boundary of the region 1 current and in the sunward convection region. The arcs corresponded to inverted-V accelerated electrons with energies of ~10 keV. On the basis of these simultaneous ground-satellite measurements, we discuss substorm onset models of reconnection/flow braking and near-Earth plasma sheet instabilities.

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