ENA Images of Ring Current Ion Precipitation 14-24 April 2002

Details ENA Images of Ring Current Ion Precipitation 14-24 April 2002 ENA Images of Ring Current Ion Precipitation 14-24 April 2002

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm32b1153d&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM32B-1153

Statistics

2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped, 2736 Magnetosphere/Ionosphere Interactions, 2788 Storms And Substorms, 2794 Instruments And Techniques

Scientific paper

The High Energy Neutral Atom (HENA) camera on the IMAGE spacecraft images ion precipitation from the ring current through the upward ENA albedo of the downward ion precipitation. A newly developed ion/neutral transport theory predicts that an appreciable fraction of the incident ions will emerge from the exosphere (albeit at a lower energy due to inelastic collisions). These emerging intensities register dramatically in the HENA images during perigee passes, yielding about 6 images with excellent pixel statistics in each 2-minute exposure. The viewing aspect during the STORMS2002 period (14-24 April) was excellent at approximately 1500 km altitude over the southern polar cap. Almost the entire sub-auroral precipitation region falls within the images at some time during the passes. The emission from precipitation is also imaged at higher altitudes when IMAGE is between about N40o-N60o magnetic latitude, but at greatly reduced spatail resolution at the larger radial distances of 4-7 RE. Our analysis techniques are still in the early stages of development, but even so, the ENA images can indicate when and where ring current precipitation is occurring. Thus they promise a new measure of geo-effectiveness of magnetic storm activity.

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