The Ion Composition of the Plasma Sheet at 15-19 Re as a function of the IMF and the Solar Wind conditions

Details The Ion Composition of the Plasma Sheet at 15-19 Re as a function of the IMF and the Solar Wind conditions The Ion Composition of the Plasma Sheet at 15-19 Re as a function of the IMF and the Solar Wind conditions

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm33b1898m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM33B-1898

Physics

[2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2744] Magnetospheric Physics / Magnetotail, [2764] Magnetospheric Physics / Plasma Sheet, [2788] Magnetospheric Physics / Magnetic Storms And Substorms

Scientific paper

Recent observational and simulation studies have reported a close correlation of the ionospheric outflow and the IMF and Solar Wind conditions. In this study we use the ion composition data from the CIS/CODIF instrument on Cluster to determine how the H+, He+ and O+ contributions to the plasma sheet density change as a function of certain IMF and Solar Wind parameters including the solar wind ram pressure, the IMF magnitude, solar wind electric field magnitude and the IMF Bz sign. These correlations will elucidate our understanding on the coupling mechanisms that drive the ionospheric outflows whose destination is the 15-19 Re plasma sheet. The Cluster spacecraft are in a polar orbit that cut through the equatorial plasma sheet at ~19Re for the first 5 years of the mission. We have restricted the data set to the apogee time periods in order to get the composition at a clear position, which can then be used, for example, as a model boundary condition. Functional forms for these dependences are provided. The statistical study covers the years from 2001-2005, which covers solar maximum, and the declining stage of the solar cycle.

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