Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh21b05d&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH21B-05
Physics
7509 Corona
Scientific paper
The dynamical behaviour of a configuration consisting of a plane fluid wake flowing in a neutral sheet is examined. Such a configuration is assumed to model a section of the streamer belt where the typical Alfven velocity exceeds the typical flow speed far away from the neutral sheet, i.e. within some solar radii. The neutral sheet is cohexisitng with a plasma sheet where the plasma beta is enhanced of two orders of magnitude with respect to typical coronal values, due to a contemporary increase of density and decrease of magnetic field. It is shown that beyond the helmet cusp such a configuration is resistively unstable and develops at the center of the streamer a magnetic island which is accelerated outwards by a Kelvin-Helmholtz instability which develops during the non-linear evolution of the resistive instability. The values of density within the island is enhanced by the nonlinear dynamics, producing a density contrast, depending on the local plasma beta, of some percents. The resulting accelerated plasmoid passively traces the acceleration of the inner part of the wake and it is claimed to represent the moving coronal features of enhanced density observed with LASCO instrument on the Solar and Heliospheric Observatory (SOHO).
Dahlburg Russell B.
Einaudi Giorgio
Velli M. M.
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