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A statistical study of the dynamics of the equatorward boundary of the diffuse aurora in the pre‐midnight sector
Author(s) -
Sauvaud J. A.,
Crasnier J.,
Galperin Yu. I.,
Feldstein Y. I.
Publication year - 1983
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/gl010i008p00749
Subject(s) - physics , geophysics , midnight , polarization (electrochemistry) , geodesy , magnetic field , inertia , electric field , boundary (topology) , dynamics (music) , plasma , geology , classical mechanics , astronomy , mathematics , chemistry , mathematical analysis , acoustics , quantum mechanics
We present a statistical study of the dynamics of the equatorward boundary of the diffuse aurora. This S oft E lectron B oundary appears to be best fitted by using the AE index values averaged over the 5 hours preceding the measurements. This inertia of the boundary is interpreted as indicative (1) of the action of a polarization electric field braking the inward motion of the corresponding equatorial plasma during increasing magnetic activity so that several successive perturbations are needed to obtain a consequent inward displacement and (2) of a weak wave‐particle interaction during periods of decreasing magnetic activity.