Using the Low-Altitude Ion Boundary MT-Index for Calibrating the Global Geomagnetic Field Models.

Details Using the Low-Altitude Ion Boundary MT-Index for Calibrating the Global Geomagnetic Field Models. Using the Low-Altitude Ion Boundary MT-Index for Calibrating the Global Geomagnetic Field Models.

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm32a0790t&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM32A-0790

Other

2708 Current Systems (2409), 2716 Energetic Particles, Precipitating, 2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2753 Numerical Modeling

Scientific paper

Low-altitude particle data can provide much information on the actual instantaneous configuration of the distant geomagnetic field. Following the ideas put forth by West et al. [1978] and by subsequent studies [Sergeev and Gvozdevsky, 1995, and references therein], we used a magnetotail stretching index (MT-index), derived from observations of energetic ion precipitation boundaries, for parameterizing the strength of the cross-tail current in a new version of the data-based magnetospheric magnetic field model. The magnetospheric vector B-field data, covering the interval from 1984 through 1999, had 5-min resolution and included observations by Polar, Geotail, ISEE-2, AMPTE/CCE/IRM, CRRES, and DE-1, complemented by concurrent interplanetary medium data from IMP-8, WIND, and ACE solar wind monitors. The low-altitude particle data, taken by DMSP satellites, covered the same period 1984-1999 and were used in the least-squares fitting algorithm in the form of concurrent values of the magnetotail stretching parameter (MT-index), calibrating the magnitude of the cross-tail current. Including the MT-associated term in the model expansions was found to significantly improve the correlation between the observed and predicted magnetic field vectors. This and other results of the present modeling effort will be discussed. West, H. I., R. M . Buck, and M. G. Kivelson, On the configuration of the magnetotail near midnight during quiet and weakly disturbed periods: magnetic field modeling, J. Geophys. Res., v.83, 3819, 1978. Sergeev, V. A., and B. B. Gvozdevsky, MT-index - a possible new index to characterize the magnetic configuration of magnetotail, Ann. Geophys., v.13, 1093, 1995.

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