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On the triggering of an isolated magnetic substorm: A theory
Author(s) -
Sinha M.,
Sundaram A. K.
Publication year - 1976
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/gl003i002p00057
Subject(s) - substorm , physics , instability , current sheet , magnetic field , magnetic reconnection , phase (matter) , field (mathematics) , computational physics , geophysics , quantum electrodynamics , astrophysics , mechanics , magnetohydrodynamics , magnetosphere , quantum mechanics , mathematics , pure mathematics
We propose a high frequency electromagnetic instability of non resonant type, driven by cross current as a source for the onset of substorm expansion phase and the field line reconnection beyond 15R E . By including a normal component of the tail field, B Z , we find that the instability can be quenched provided B Z exceeds certain threshold value ‐ 1.8 × 10 6 √Te/λ gauss (0.06 γ, for typical values in the neutral sheet).