Change of the Plasma Sheet Ion Composition During Magnetic Storm Development

Details Change of the Plasma Sheet Ion Composition During Magnetic Storm Development Change of the Plasma Sheet Ion Composition During Magnetic Storm Development

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm42c05n&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM42C-05 INVITED

Physics

2788 Storms And Substorms

Scientific paper

Energetic ion composition of the outer ring current (L=5-7) changes drastically during magnetic storms. It has been reported that H+ ions are dominant during quiet times, while ions of ionospheric origin, O+ ions in particular, become an important constituent during storms. Recent Geotail study showed that this ion composition change in the outer ring current is a consequence of the composition change occurring in the near-Earth plasma sheet. However, it is still controversial how O+ ions are energized to the ring current energies ( ~200 keV) in the plasma sheet. In the present study we investigate the energy density of H+, He+, and O+ ions in the plasma sheet (X>-30 Re) during the main phase of magnetic storms, using energetic (9-210 keV) particle flux data obtained by the EPIC instrument on the Geotail spacecraft. The focus of the study is placed on how the O+/H+ and He+/H+ energy density ratios change as the Dst index decreases. We also investigate the effect of storm-time substorms on the energy density ratios. We will discuss what mechanisms are responsible for change of the energetic ion composition in the plasma sheet during magnetic storms.

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