抄録
Mechanisms for fast/driven magnetic reconnection have been investigated by measuring 2.5-dimensional current sheet structures of laboratory merging plasmas. The reconnection speed is observed to increase with decreasing magnetic field component parallel to the “X-point” line and with increasing external force to compress the current sheet. The measured resistivity of the current sheet is found to increase significantly right after the current sheet is compressed shorter than its ion Larmor radius. The anomalous resistivity of the current sheet caused by the finite Larmor radius effect is concluded essential to the fast/driven-type reconnection whose speed depends strongly on the X-line field and the external force.
© 1999 by The Japan Society of Plasma Science and Nuclear Fusion Research (Japanese)