Solar wind ion access to the plasma sheet during the September 24-25, 1998 magnetic storm

Details Solar wind ion access to the plasma sheet during the September 24-25, 1998 magnetic storm Solar wind ion access to the plasma sheet during the September 24-25, 1998 magnetic storm

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm22a..01p&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM22A-01

Physics

2724 Magnetopause And Boundary Layers, 2744 Magnetotail, 2764 Plasma Sheet, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

We have used a global time-dependent magnetohydrodynamic (MHD) simulation of the magnetosphere and particle tracing calculations to determine the entry of solar wind ions into the magnetosphere and their access to the storm-time near-Earth plasma sheet and ring current during the September 24-25, 1998 magnetic storm. The September 24 - 25, 1998 magnetic storm began with the arrival of a sudden impulse at 23:45 UT on September 24th which abruptly increased the solar wind dynamic pressure on the nose of the magnetosphere from 2 nPa to 15 nPa. Dst reached a minimum of -207 at 1000 UT on September 25th. To study solar wind entry, we launched ions upstream of the bowshock at 5-minute intervals beginning one hour prior to the shock arrival and continuing throughout the sudden storm commencement and the main phase of the storm. Ions were launched with the solar wind streaming velocity and thermal spread measured at that time. Following the particle trajectories through detectors placed within the magnetopause current layer allowed us to gain a better understanding of the transport and acceleration of solar wind plasma through the magnetopause during this storm. We will also show time-varying maps of the solar wind ion density in the plasma sheet and ring current during the storm, the energization of ions in the magnetotail current sheet, and their loss from the magnetosphere.

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