IMP 8 magnetotail boundary crossings - A test of the MHD models for an open magnetosphere

Details IMP 8 magnetotail boundary crossings - A test of the MHD models for an open magnetosphere IMP 8 magnetotail boundary crossings - A test of the MHD models for an open magnetosphere

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9520771s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Dec. 1, 1990, p. 20771-20779.

Physics

17

Atmospheric Models, Earth Magnetosphere, Explorer 50 Satellite, Geomagnetic Tail, Solar Terrestrial Interactions, Space Plasmas, Interplanetary Magnetic Fields, Magnetohydrodynamics, Magnetopause, Symmetry

Scientific paper

A statistical analysis of all the magnetotail boundary crossings recorded between January 1974 and December 1982 by IMP 8 has been performed. The results show that the open tail boundary is to a large extent characterized by a rotational-discontinuity/plasma-mantle structure whose geometry is consistent with MHD models. Relevant parameters are estimated, including the an average size of roughly 100 deg for the open window for a horizontal orientation of the IMF and a value of 24 deg for the tilt of its asymmetry axis relative to the earth's dipole axis. A dependence of the average normal magnetic field component on the inclination of the IMF is suggested by minimum variance analyses. The strongest normals occur for a southward orientation, with an average of 0.202 (normalized to the total field magnitude); an intemediate value is found for an east-west orientation where the average is 0.182, and the smallest average normal field of 0.150 is found when the IMF has a northward orientation.

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