Response of the Near Earth Plasma Sheet to an Impulsive Variation of the IMF

Details Response of the Near Earth Plasma Sheet to an Impulsive Variation of the IMF Response of the Near Earth Plasma Sheet to an Impulsive Variation of the IMF

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm62a02e&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM62A-02

Physics

2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2764 Plasma Sheet

Scientific paper

Spacecraft observations from the ISTP program and results from global magnetohydrodynamic (MHD) simulations were used to analyze a September 4, 1996, substorm. During this event a variation in By with a magnitude near 10 nT and with short duration occurs. At about 2135 UT on that day, GEOTAIL was located at x = ~12, y = -8.7, and z = -0.8 RE in geocentric solar ecliptic (GSE) coordinates, and observed a tailward flow that was accompanied by a negative Bz magnetic-field component. GEOTAIL measured plasma sheet parameters throughout the expansion phase of the substorm. The observed flow has since been interpreted as a signature of reconnection close to the Earth [Frank et al., 2000]. Measurements from the Wind spacecraft taken during the substorm from its position of 90 RE upstream of the Earth were used as input to the MHD simulation. After assessing the validity of the model's results by comparing simulated time series with GEOTAIL and INTERBALL observations, we investigate the time evolution of the plasma sheet. In particular, we examine the response of the magnetotail topology to an impulse observed in the IMF and show that it had a significant impact on the dynamics of the near-Earth plasma sheet.

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