Storm-Time Distortions of the Inner and Near Magnetosphere: How Severe Can They Get ?

Details Storm-Time Distortions of the Inner and Near Magnetosphere: How Severe Can They Get ? Storm-Time Distortions of the Inner and Near Magnetosphere: How Severe Can They Get ?

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm22a..05t&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM22A-05

Physics

2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2753 Numerical Modeling, 2788 Storms And Substorms

Scientific paper

This paper presents initial results of modeling the magnetic field in the inner geospace during strong magnetospheric disturbances. Major storms are relatively rare events, represented by only a tiny fraction of the data used in the derivation of the empirical magnetospheric models, in particular, the most recent T01 model [Tsyganenko, 2002]. Predicting storm-time magnetospheric configurations by using existing data-based models is actually an extrapolation from the field, based on quiet-time and moderately disturbed data. Even though such extrapolations reproduce basic features of large disturbances, quantitatively they can still be quite inaccurate. In this work, we selected spacecraft magnetometer data, pertaining to only clear-cut strong storm events with Dst<=-100nT. The final data set included storms observed during a 16-year period between 1984 and 2000 and comprised the data taken in the inner and near magnetosphere by Polar, GOES, Geotail, and DE-1, complemented by a few events observed by AMPTE/CCE, CRRES, and Equator-S spacecraft. In all cases, only those storms were selected, for which concurrent solar wind data were available, covering the intervals of peak Dst depression and/or its largest decrease rate during the storm main phase. Over 50 events from the 16-year period were selected and used in the derivation of an empirical stormy magnetosphere model. The magnetic field was represented using the T01 model sources, including a partial ring current on the duskside. As convincingly demonstrated by recent studies, that current is a major source of the stormtime disturbance in the inner magnetosphere, caused by enhanced plasma convection, and manifested in a dramatic dawn-dusk asymmetry of the inner geomagnetic field. Results of the least squares fitting and mapping the model field lines for specific events will be discussed. References: N. A. Tsyganenko, A model of the near magnetosphere with a dawn-dusk asymmetry: 1. Mathematical structure, and 2. Parameterization and fitting to observations, J. Geophys. Res., 107, 2002, in press.

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