Ion dynamics in the plasma sheet and inner magnetosphere during storm-time substorms

Details Ion dynamics in the plasma sheet and inner magnetosphere during storm-time substorms Ion dynamics in the plasma sheet and inner magnetosphere during storm-time substorms

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm44a..06p&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM44A-06

Physics

2744 Magnetotail, 2764 Plasma Sheet, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954), 2790 Substorms

Scientific paper

We have investigated the dynamics of ions in the magnetotail during the 17 April 2002 and 28 October 28 2001 geomagnetic storms, focusing on the substorms that occurred during these events. We did so by using the large-scale kinetic (LSK) particle tracing technique and ion sources in the solar wind and in the ionosphere to populate the magnetosphere. The three-dimensional, time-dependent magnetic and electric fields for each calculation were obtained from global magnetohydrodynamic (MHD) simulation that used solar wind and interplanetary magnetic field data from the upstream spacecraft. In each case, we launched ions ~2 hours prior to storm onset and continued launching at regular intervals for twelve hours during the sudden storm commencement and the main phase of the storm. Solar wind H+ ions were launched with the solar wind streaming velocity and thermal speed measured at that time. The outflow rates and locations of ionospheric H+ and O+ ions were specified by empirical models. H+ and O+ number and energy densities in the near-Earth plasma sheet obtained from the LSK calculations will be compared with densities obtained by inverting IMAGE/HENA data, with special emphasis on the effect of the substorm on ion distributions in the inner magnetosphere. We will also compare the effect of the sudden storm commencement on ion velocity distributions in the near-Earth magnetotail to the effect of substorms on the inner magnetosphere ion distributions.

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