On the triggering of an isolated magnetic substorm: A theory | Zendy

Sinha M. | Zendy; Sundaram A. K. | Zendy

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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).

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