Current interruption by density depression

Details Current interruption by density depression Current interruption by density depression

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...98..305w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 98, Aug. 1985, p. 305-322.

Physics

2

Collisionless Plasmas, Plasma Currents, Plasma Density, Solar Flares, Solar Physics, Ion Acoustic Waves, Ion Density (Concentration), Magnetohydrodynamic Stability, Simulation, Solitary Waves

Scientific paper

Using a one-dimensional electrostatic particle code, processes associated with current interruption in a collisionless plasma when a density depression is present along the current channel are examined. Current interruption due to double layers was suggested by Alfven and Carlqvist (1967) as a cause of solar flares. At a local density depression, plasma instabilities caused by an electron current flow are accentuated, leading to current disruption. This simulation study encompasses a wide range of the parameters in such a way that under appropriate conditions, both the Alfven and Carlqvist (1967) regime and the Smith and Priest (1972) regime take place. In the latter regime the density depression decays into a stationary structure ('ion-acoustic layer') which spawns a series of ion-acoustic 'solitons' and ion phase space holes travelling upstream. A large inductance of the current circuit tends to enhance the plasma instabilities.

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