Modified Petschek Reconnection

Details Modified Petschek Reconnection Modified Petschek Reconnection

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm22a04k&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM22A-04 INVITED

Physics

7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection

Scientific paper

There is an additional condition in Petschek's theory of magnetic reconnection that uniquely determines the length of his diffusive layer. As a result this length previously thought to be a free parameter, is actually determined by the physics that holds in the reconnection layer. If the physics is resistive MHD, then the Petschek reconnection velocity, vR reduces to that of Sweet and Parker. If the physics involves enhanced resistivity, then one finds that the reconnection velocity varies as the one third power of the maximum possible value of the enhanced resistivity, or the corresponding minimum value of the Lundquist number. If the plasma is collisionless and the resistivity is absolutely zero, and the hall terms dominate, then the rate may well be that given by Drake et. al., e. g. vR ≈ 0.1 vA .

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