Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm24a..01k&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM24A-01
Physics
2736 Magnetosphere/Ionosphere Interactions (2431), 2744 Magnetotail, 2764 Plasma Sheet, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
We have used CLUSTER ion composition data from the CIS instrument to study ionospheric ion access to the plasma sheet during storms. Our earlier work on storm-time and non-storm substorms in the plasma sheet has shown that O+ is significantly enhanced during a storm main phase. In addition we have observed that tailward moving O+ beams in the lobe, which are ions transported from the cusp, also increase during storm times. In this study we concentrate on whole storm time periods in order to determine when the changes in plasma sheet composition occur relative to changes in the solar wind and changes in Dst, and over what time scales the O+ decreases after the main phase. We have identified a number of geomagnetic storm time periods when CLUSTER observes the plasma sheet, as well as the lobes and polar cap, before the storm, during the storm main phase and during the recovery phase. In the plasma sheet, the increase in O+ is well correlated with the drop in Dst, indicating that the enhanced convection that brings ions into the ring current is also involved in bringing ions into the plasma sheet. In the polar cap and lobe, the occurrence of O+ beams also increases when Dst drops. During the recovery phase, the O+ in the plasma sheet is reduced. However, there are times when beams in the polar cap and lobe are still observed. This implies that while there is still significant outflow during the recovery phase, the ions flowing from the cusp no longer have access to the near- earth plasma sheet.
Dandouras Iannis
Kistler Lynn M.
Klecker Berndt
Mouikis Christopher
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