Sub-keV Electron Signatures Within Pulsating Aurora

Details Sub-keV Electron Signatures Within Pulsating Aurora Sub-keV Electron Signatures Within Pulsating Aurora

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13a1643j&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM13A-1643

Computer Science

Sound

2407 Auroral Ionosphere (2704), 2455 Particle Precipitation, 2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 2736 Magnetosphere/Ionosphere Interactions (2431)

Scientific paper

The Rocket Observations of Pulsating Aurora (ROPA) sounding rocket was launched on February 12, 2007 at 12:45:04UT from Poker Flat Research Range, AK into a region of pulsating aurora. One hour beforehand, the REIMEI satellite passed through the same pulsating aurora event, within the field - of - view of the Poker Flat all sky camera. Previous measurements of electron precipitation associated with pulsating aurora have varied with many showing high energy, tens to hundreds of keV, modulated populations. Collocated with the pulsating aurora, REIMEI and ROPA ESA data from Feb 12, 2007 show low energy (<1 keV) inverted - v type structures within a region of widespread, diffuse plasma sheet precipitation, suggesting the presence of a local electric field, which seem to correspond with optical pulsations. Poker Flat Incoherent Scatter Radar (PFISR) observations of this event show intermittent ionospheric electron density enhancements at high altitudes which may be the signature of these inverted - v type features. These observations are consistent with those of Sato et. al. (2002, 2004) who suggest a near - Earth modulation source for the pulsating aurora, as opposed to modulated cyclotron resonance interactions in the equatorial magnetosphere. The focus of this presentation will be the relationship, if any, between these low energy structures and the pulsating aurora, which at present remains unclear.

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