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Quantifying Gyrotropy in Magnetic Reconnection

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arxiv 1509.00787 v2 pith:6FFGDIB4 submitted 2015-09-02 physics.space-ph

Quantifying Gyrotropy in Magnetic Reconnection

classification physics.space-ph
keywords magneticgyrotropymeasuremeasuresreconnectionanalyzingarbitrarycalculated
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A new scalar measure of the gyrotropy of a pressure tensor is defined. Previously suggested measures are shown to be incomplete by means of examples for which they give unphysical results. To demonstrate its usefulness as an indicator of magnetic topology, the new measure is calculated for electron data taken from numerical simulations of magnetic reconnection, shown to peak at separatrices and X-points, and compared to the other measures. The new diagnostic has potential uses in analyzing spacecraft observations and so a method for calculating it from measurements performed in an arbitrary coordinate system is derived.

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