Mathematics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.346...39k&link_type=abstract
In ESA, Study of the Solar-Terrestrial System p 39-41 (SEE N93-31674 12-90)
Mathematics
Magnetic Disturbances, Magnetohydrodynamic Waves, Retarding, Solar Corona, Solar Heating, Solar Oscillations, Solar Prominences, Electric Corona, Mathematical Models, Photosphere
Scientific paper
The temporal evolution of a coronal current filament in terms of the mirror current concept is studied, taking into account the effect of time retardation when a filament, originally in equilibrium, starts rising. A filament current subject to a perturbation experiences the photospheric boundary an Alfven bounce time later. This retardation effect gives rise to an extra force which causes the filament to oscillate around an equilibrium position, emitting Alfven waves which damp the filament oscillations. The onset of filament oscillations is a natural consequence of the presence of the inert photospheric boundary and the finite Alfven speed. Numerical simulations that show the evolution of a filament in a bipolar magnetic field as the filament current slowly increases are presented. The emission of waves during this evolution is an important energy source for the coronal heating.
Kuperus Max
van den Oord H. J. G.
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