Other
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ge%26ae..49..169k&link_type=abstract
Geomagnetism and Aeronomy, Volume 49, Issue 2, pp.169-178
Other
94.30.Cl
Scientific paper
Two time scales are distinguished in the geomagnetotail dynamics. The small scale ( T 1) corresponds to disturbances propagating in the tail lobes, which have a relatively strong magnetic field and low plasma density. The larger scale ( T 2) corresponds to plasma motions in the plasma sheet and has a relatively weak magnetic field and a relatively higher density. A disturbance, which is initiated by a localized burst of magnetic reconnection and appears in the geomagnetotail on the time scale T 1, generates the upset of equilibrium in the plasma sheet zones with intermediate spatial dimensions (about R E). The theoretical considerations and numerical simulation indicate that the relaxation process, which subsequently proceeds on the larger time scale ( T 2), results in the appearance of extremely thin embedded current sheets and in the generation of fast plasma flows. This process gives an effective mechanism by which the magnetic energy stored in the geomagnetotail is transformed into the plasma flow kinetic energy. Such fast flows can also generate eddy plasma motions on smaller spatial scales. On the one hand, fast MHD components of this process carry a disturbance in other plasma sheet zones, where new magnetic reconnection bursts can originate at a large distance from the zone of an initial nonlinear disturbance. As a result, new recurrent processes of relaxation originate on the T 2 time scale. Alternation originating in such a way is apparently the characteristic feature of eddy disturbances actually observed in the plasma sheet.
Domrin V. I.
Kropotkin Alexey P.
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