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Astronomy & Astrophysics manuscript no. (will be inserted by hand later)

Summary: Astronomy & Astrophysics manuscript no.
(will be inserted by hand later)
Physical consequences of the inclusion of anomalous resistivity
in the dynamics of 2D magnetic reconnection
I. Roussev 1;2 , K. Galsgaard 3 , and P. G. Judge 1
1 High Altitude Observatory, NCAR, 3450 Mitchell Lane, Boulder, CO 80301, USA; e­mail: ilr@ucar.edu;
2 Armagh Observatory, College Hill, Armagh, BT61 9DG, N. Ireland;
3 University of St. Andrews, School of Mathematics and Statistics, North Haugh, St. Andrews, Fife, KY16 9SS,
Scotland; e­mail: klaus@mcs.st­and.ac.uk
Received date, accepted date
Abstract. The aim of the present paper is to explore the role of anomalous resistivity on the dynamics of magnetic
reconnection in a 2D environment of relevance to the solar transition region. We adopt an ad hoc but explicit
form of the anomalous resistivity, motivated by a streaming instability, in which the resistivity jumps suddenly
as the electron drift velocity exceeds some fraction of the mean electron thermal speed. Experiments have been
conducted to investigate the impact of various critical speeds and arbitrary scaling constants of the resistivity
level on the time­dependent evolution of the magnetic reconnection process. The specific threshold value is found
to influence the dynamics of the reconnection, with higher values providing a localised on­off effect of patchy
diffusion. For a given normalised value of the anomalous resistivity, the amount of Joule heating released scales
inversely with the threshold value.


Source: Armagh Observatory


Collections: Physics