Observation of dayside subauroral proton flashes with the IMAGE-FUV imagers

Details Observation of dayside subauroral proton flashes with the IMAGE-FUV imagers Observation of dayside subauroral proton flashes with the IMAGE-FUV imagers

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30c..45h&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 3, pp. 45-1, CiteID 1145, DOI 10.1029/2002GL016464

Physics

17

Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

A detailed description of an intense flash of auroral emissions that occurs equatorward of the dayside auroral oval observed with the IMAGE-FUV imagers is presented. The comparison of simultaneous snapshots of this subauroral flash obtained with the three FUV cameras indicates that proton precipitation is dominant. This transient proton aurora is triggered by the sudden increase of a solar wind dynamic pressure pulse. It occurs on closed field lines mapping to the equatorial plane at distances as small as ~4 RE. A second similar event is presented, and several other cases are mentioned. These shock induced transcient emissions develop with a time scale of a few minutes (typically ~5 min), and have a relaxation time on the order of ~10 minutes.

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