Plasmapause morphology determined from an empirical ionospheric convection model

Details Plasmapause morphology determined from an empirical ionospheric convection model Plasmapause morphology determined from an empirical ionospheric convection model

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.1151d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, Feb. 1, 1992, p. 1151-1156.

Physics

17

Convection Currents, Ionospheric Currents, Magnetoplasmadynamics, Plasmapause, Earth Magnetosphere, Earth Rotation, Models, Morphology, Space Plasmas

Scientific paper

Results are examined of mapping the convection electric potential at ionospheric heights, as derived from empirical ionospheric convection models, to the equatorial plane in the magnetosphere where it is added to the earth's rotational potential. The sensitivity of plasmapause shape and size derived in this way was studied by varying the z and y components of the IMF and the geomagnetic activity index. Results show that the model of Heppner and Maynard (1987) produces plasmasphere morphology that is broadly consistent with prior ground-based and satellite measurements of plasmapause position. It is shown that the largest change in the characteristic shape of the plasmapause is due to the direction of IMF Bz; for IMF Bz southward, the plasmapause is circular, while a broad oval plasmapause is found for IMF Bz northward. The ability of this model to reproduce the Lpp-LT shape of the plasmapause shows that empirical ionospheric convection models can be extended to provide a useful method to determine plasmapause location for a variety of steady geomagnetic conditions.

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