Diamagnetic Stabilization of Magnetic Reconnection

Details Diamagnetic Stabilization of Magnetic Reconnection Diamagnetic Stabilization of Magnetic Reconnection

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm42b01s&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM42B-01

Physics

7835 Magnetic Reconnection

Scientific paper

Observations show that strong pressure gradients exist at both the earth's magnetopause and in tokamak sawtooth oscillations, but the effect of these gradients --- and their accompanying diamagnetic drifts --- on the nonlinear rate of magnetic reconnection is not completely known. Earlier fluid simulations of such tokamak configurations have suggested that the rate, which decreases as the plasma β increases, can be significantly altered. To address the question we present 2-D particle simulations of magnetopause-like configurations of the pressure and magnetic field. Our results show strong asymmetries in the region surrouding the X-line as well as a large, presumably diamagnetic, motion, of the X-line itself. We also discuss the impact of the pressure gradients on the reconnection rate.

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