A global simulation of the magnetosphere with a long tail - No interplanetary magnetic field

Details A global simulation of the magnetosphere with a long tail - No interplanetary magnetic field A global simulation of the magnetosphere with a long tail - No interplanetary magnetic field

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.3929k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A4, April 1, 1992, p. 3929-3943.

Physics

19

Earth Magnetosphere, Geomagnetic Tail, Magnetic Dipoles, Magnetohydrodynamic Flow, Solar Wind, Three Dimensional Models, Dynamic Pressure, Interplanetary Magnetic Fields, Neutral Sheets, Satellite Observation

Scientific paper

The study performs a global 3D MHD simulation of the magnetosphere with a long tail (about 100 RE). Concentration of the plasma sheet current was found to occur preferentially at 14-18 RE on the tail side of the earth, from which it is inferred that, magnetically, this is the most fragile region of the tail structure. In the present initial value problem, reconnection occurs at 15-20 RE in the tail and develops into a large lump of plasma surrounded by reconnected field lines, a plasmoid, which is ejected tailward. The time scale of the plasmoid formation and ejection process is of the order of several hours, when no IMF exists. After one plasmoid is ejected, reconnection occurs again in the plasma sheet, and a second plasmoid is formed and ejected. It is inferred that a magnetosphere that has a sufficiently long tail and a neutral sheet is fragile and subject *o plasmoid formation. It is also shown that the hot plasma, when mapped down to the ionosphere along the field lines, encompasses the auroral oval in agreement with the DE satellite observations.

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