FAST and IMAGE-FUV observations of a Substorm onset

Details FAST and IMAGE-FUV observations of a Substorm onset FAST and IMAGE-FUV observations of a Substorm onset

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12a0463m&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM12A-0463

Physics

2704 Auroral Phenomena (2407), 2716 Energetic Particles, Precipitating, 2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics, 2788 Storms And Substorms

Scientific paper

On the 6th of February 2002, the NASA FAST satellite transited a substorm break up arc approximately one minute after substorm onset as identified by the NASA IMAGE far ultraviolet (FUV) instrument complement. The bright onset feature had two particle components, a poleward super-thermal electron, and an equatorward quasi static "inverted V" electric field generated component. The super-thermal electrons were closely aligned with the magnetic field with a non-peaked energy distribution consistent with an Alfven wave acceleration. The onset arc is at the poleward boundary of the hot plasma sheet protons. Separated from the Alfven wave accelerated aurora, on the equatorward side, an inverted V type aurora was seen with its quasi-static electric field signature. The FAST particle measurements show an extended region of closed field lines separating the ground onset location (64.2o ILAT) from the closed/open field line boundary identified by polar rain electrons at 70.6o ILAT. No magnetic or particle activity related to substorm onset was detected in this high latitude region. The onset is therefore located at some distance from the open-and-closed-field-line boundary in the tail, which is the location of the steady state convective reconnection region. Prior work with FAST and IMAGE FUV data showed that during later phases of the substorm development, the Alfven wave accelerated electrons and the corresponding auroral surge were regularly seen much closer to the polar cap boundary. Comparison of the onset event with those indicates that substorm field line configuration change leads to the surge propagating poleward through a region of closed field lines towards the open-and-closed-field-lines boundary. These observations are consistent with both the near earth neutral line (NENL) and the tail current disruption substorm model.

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