Physics
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ge%26ae..46..616m&link_type=abstract
Geomagnetism and Aeronomy, Volume 46, Issue 5, pp.616-621
Physics
94.30.Gm, 94.30.Cl
Scientific paper
The theory of relaxation of geomagnetic depression observed during magnetic storm has been proposed based on the knowledge of the interaction between the Dst index and the magnetotail current. It has been indicated that the disruption of the tail current that was enhanced during the storm main phase can be caused by the interchange instability, which develops in the boundary plasma sheet due to the sheet curvature in the near to the Earth region and due to a sharp, directed toward the curvature center, plasma pressure gradient at the boundary between the plasma sheet and the tail lobe. The dispersion equation and expression for the instability growth rate have been obtained. The theoretically predicted characteristic time of storm depression relaxation τ is ˜10 h and is in good agreement with the experimental estimate.
Golovchanskaya I. V.
Gomzikova S. S.
Maltsev Yu. P.
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