WINDII measurements of nightglow enhancements in the South Atlantic magnetic anomaly zone

Details WINDII measurements of nightglow enhancements in the South Atlantic magnetic anomaly zone WINDII measurements of nightglow enhancements in the South Atlantic magnetic anomaly zone

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2355w&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 15, p. 2355-2358

Physics

1

Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Pressure, Density, And Temperature, Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions

Scientific paper

Enhancements of the O(1D) 630 nm and O(1S) 558 nm volume emission rates were detected by WINDII, the Wind Imaging Interferometer on board the Upper Atmosphere Research Satellite, UARS, as its limblocked fields of view crossed the South Atlantic magnetic anomaly zone during periods of high geomagnetic activity. The enhancement attributed to electron precipitation is 20 R for the 630 nm red line and 3 R for the 558 nm green line, less than the natural variability of these nightglow emissions as seen from below. Nevertheless, statistical tests indicate with 95% confidence that the enhancements are significantly distinguishable from the natural variability. The red enhancement lies west of the green because eastward drifting trapped electrons move toward lower mirror altitudes in this region. These enhancements are energetically consistent with earlier measurements of electron fluxes in this region; we estimate the total precipitation energy deposition rate at a few megawatts.

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