Physics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.8391o&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A6, June 1, 1992, p. 8391-8397. Research supported by DFG.
Physics
13
Atmospheric Physics, Auroral Arcs, Magnetic Field Reconnection, Tearing Modes (Plasmas), Electron Precipitation, Field Aligned Currents, Plasma-Particle Interactions
Scientific paper
Results are presented from a study of the intrinsic dynamic development of discrete auroral arcs, which appear as bright structures along geomagnetic field lines and are associated with precipitating electrons and field-aligned currents. Such configurations may be unstable with respect to the tearing mode instability because of the magnetic shear produced by the field-aligned current. It is suggested that the tearing instability and magnetic reconnection may cause the small-scale filamentation of auroral arcs as it is observed in auroral spirals and folds. The full dispersion relation for the resistive tearing mode is derived and solved.
Birk G.
Otto Andreas
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