Strong Plasma Acceleration by Slow Shocks Resulting from Magnetic Reconnection.

摘要

An externally-driven magnetic reconnection is simulated for two two-dimensional magnetohydrodynamic models with anomalous resistivity: a closed boundary model where an O-type neutral point is formed between two X-type neutral points;and an open-ended model where only an X-type neutral point is formed. Computer runs have shown that: (1) X-shaped (Petschek type) slow shocks are formed. (2) In the closed boundary case,the plasma entering into the magnetic island through the X-type neutral points are moderately accelerated along the magnetic island boundaries. (3) In the open-ended case,the plasma acceleration is intensified and strong jet streams are generated on the downstream side of the slow shocks,with the speed approaching the Alfven speed of the upstream region. (ERA citation 04:047965)