A statistical comparison of ion bulk properties at geosynchronous orbit during moderate and intense geomagnetic storms at solar minimum and maximum

Details A statistical comparison of ion bulk properties at geosynchronous orbit during moderate and intense geomagnetic storms at solar minimum and maximum A statistical comparison of ion bulk properties at geosynchronous orbit during moderate and intense geomagnetic storms at solar minimum and maximum

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm44a..02z&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM44A-02

Physics

2700 Magnetospheric Physics, 2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2764 Plasma Sheet, 2788 Storms And Substorms

Scientific paper

Geosynchronous orbit plasma observations by the LANL MPAs before and during 42 intense storms and 111 moderate storms at solar minimum (January, 1995 - June, 1997) and at solar maximum (July, 1999 - June, 2002) are collected, categorized, and analyzed through the superposed epoch technique. The storms are defined by the pressure corrected Dst (Dst*). IMF southward Bz (Bs ) from the Wind and ACE spacecrafts is also included in this study. The similarities and differences among the average variations of IMF Bs, four channel fluxes (with energies ~30 keV, ~18 keV, ~7 keV, and ~1 keV) and several derived bulk properties of ions at geosynchronous orbit, and Dst* in the four storm categories are examined. It is found that both IMF Bs and plasma sheet density determine the intensity of the storm-time ring current. At geosynchronous orbit, hot-ion fluxes, density, and temperature vary with local time and are enhanced in high geomagnetic activity. It is also shown that hot ions are nearly isotropic in the central plasma sheet during storms. On the nightside, the storm-time temperature of hot ions at solar minimum is higher than that at solar maximum.

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