The Role of Plasma Sheet Conditions in Ring Current Formation and Energetic Neutral Atom Emissions: TWINS Results and CRCM Comparison

Details The Role of Plasma Sheet Conditions in Ring Current Formation and Energetic Neutral Atom Emissions: TWINS Results and CRCM Comparison The Role of Plasma Sheet Conditions in Ring Current Formation and Energetic Neutral Atom Emissions: TWINS Results and CRCM Comparison

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm73a..04f&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM73A-04

Physics

2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2764 Plasma Sheet, 2778 Ring Current

Scientific paper

The dynamics of the ring current is sensitive to plasma sheet density and temperature. The situation is further complicated by ionospheric feedback and the existence of electric shielding at low latitudes. Most of the ring current pressure is carried by ions with energies of ~5-50 keV. In this energy range, H-H+ charge exchange cross section falls sharply with increasing energy. As a result, the intensity of energetic neutral atoms (ENA) emitted from the ring current is very sensitive to the ion energy distribution, which, in turn, is controlled by the plasma sheet temperature. Using the Comprehensive Ring Current Model (CRCM) with different plasma sheet models, we calculate ENA emissions during several moderate storms in years 2008 and 2009. We compare the simulated images with those from the TWINS imagers and study the effects of plasma sheet conditions on the ring current and the associated ENA emissions.

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