Equatorward moving auroral signatures of a flow burst observed prior to auroral onset

Details Equatorward moving auroral signatures of a flow burst observed prior to auroral onset Equatorward moving auroral signatures of a flow burst observed prior to auroral onset

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53d..07k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM53D-07

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2790] Magnetospheric Physics / Substorms

Scientific paper

We present observations of substorm onset from an event that occurred on February 25, 2008. Auroral onset was observed with the NORSTAR multi-spectral and THEMIS white-light all sky imagers at Gillam. An equatorward moving diffuse auroral form was observed in the 630.0 nm images at least 5 minutes prior to onset. This form emerged from the background noise poleward of the eventual onset arc and intensified as it moved equatorward. Auroral onset occurred when this form reached the onset arc location. Nearly 90 seconds prior to auroral onset high-speed flows were detected by THEMIS probes P3 (TH-D) and P4 (TH-E) near X~-11 RE. We suggest that the equatorward moving 630.0 nm auroral form was created by precipitating electrons scattered by an earthward moving flow burst that formed prior to auroral substorm onset. We conclude that the results strongly support flow-burst driven models of magnetospheric activity.

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