Medium Energy Neutral Atom (MENA) Emissions and the Evolution of the Low Energy Portion of Earth's Ring Current Drift Paths from Open to Closed

Details Medium Energy Neutral Atom (MENA) Emissions and the Evolution of the Low Energy Portion of Earth's Ring Current Drift Paths from Open to Closed Medium Energy Neutral Atom (MENA) Emissions and the Evolution of the Low Energy Portion of Earth's Ring Current Drift Paths from Open to Closed

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm52a..03p&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM52A-03

Other

2712 Electric Fields (2411), 2760 Plasma Convection, 2778 Ring Current, 2788 Storms And Substorms

Scientific paper

Storm-time images from the MENA imager on NASA's IMAGE satellite are presented. Previous observations have shown a large degree of asymmetry in the MLT distributions of storm-time ENA emissions, particularly during the main phase. In contrast, during the late storm recovery the distributions have been observed to become more symmetric. These observations have been interpreted to indicate large scale plasma loss at the day side magnetopause due to enhanced convection during storm main phase and subsequent trapping and and ring current symmeterization later in the recovery phase. We have examined the MENA images from numerous storms, along with the corresponding Dst signatures. The objectives are to identify how typical this transition from asymmetric to symmetric distributions is, and to identify any association between the transition on the one hand, and a break in the Dst recovery profile from steep to more gradual on the other. Such an association would indicate that the transition in Dst recovery rates is due to a transition in ring current drift paths from open to closed.

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