Physics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994angeo..12..183r&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 12, no. 2/3, p. 183-187
Physics
1
Geomagnetism, Interplanetary Magnetic Fields, Magnetic Flux, Magnetopause, Magnetosheath, Magnetohydrodynamic Flow, Solar Wind, Space Plasmas
Scientific paper
It is shown that the interaction of the interplanetary magnetic field (IMF), when it has southward component, with the geomagnetic field leads to the formation of an enhanced pressure layer (EPL) near the magnetopause. Currents flowing on the boundary between the EPL and the magnetosheath prevent the IMF from penetrating the magnetosphere. However, the outward bondary of the EPL is unstable. The interchange instability permanently destroys the EPL. Separate filaments of the EPL move away from the Earth. New colder plasma of the magnetosheath with a frozen magnetic field replaces the hotter EPL plasma, and the process of EPL formation and destruction repeats itself. The instability increment is calculated for various magnitudes of the azimuthal wave number, k(sub y), and curvature radius of the magnetic field lines, R(sub c). The disturbances with R(sub e exp -1) less than or equal to k(sub y) less than or equal to 4R(sub e exp -1) (where R(sub e) is the Earth's radius) and R(sub e) less than or equal to R(sub e) are the most unstable. A possible result of the interchange instability of the EPL may be patchy reconnection, displayed as flux transfer events (FTEs) near the magnetopause.
Maltsev Yu. P.
Rezhenov B. V.
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