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Direct‐driven mechanism for geomagnetic storms
Author(s) -
Arykov A. A,
Maltsev Yu. P.
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl01025
Subject(s) - magnetosphere , magnetopause , geomagnetic storm , solar wind , geophysics , physics , magnetosheath , earth's magnetic field , atmospheric sciences , storm , meteorology , magnetic field , quantum mechanics
We have obtained the injection function for the part of the storm‐time depression which is related to the cross‐tail current and corresponding currents on the magnetopause. This injection function is Q TC =−κ U/S , where U is the electric potential difference between the dawn and dusk sides of the magnetosphere, S is the equatorial cross‐section of the stable trapping region, and κ is a coefficient varying from 0.5 to 1.5 depending on the state of the magnetosphere and solar wind pressure. The injection function Q TC appeared to be close to the observed one for the Dst ‐variation.