An Analytic Study of the Perpendicularly Propagating Electromagnetic Drift Instabilities in the Magnetic Reconnection Experiment Page: 3 of 48
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An Analytic Study of the Perpendicularly Propagating
Electromagnetic Drift Instabilities in the Magnetic Reconnection
Yansong Wang, Russell Kulsrud, Hantao Ji
A local linear theory is proposed for a perpendicularly propagating drift instability driven by
relative drifts between electrons and ions. The theory takes into account local cross-field current,
pressure gradients and modest collisions as in the Magnetic Reconnection Experiment (MRX)
. The unstable waves have very small group velocities in the direction of the pressure gradient,
but have a large phase velocity near the relative drift velocity between electrons and ions in the
direction of cross-field current. By taking into account the electron-ion collisions and applying
the theory in the Harris sheet, we establish that this instability could be excited near the center
of the Harris sheet and have enough e-foldings to grow to large amplitude before it propagates
out of the unstable region. Comparing with the other magnetic reconnection related instabilities
(LHDI, MTSI et.) studied previously, we believe the instability we find is a favorable candidate to
produce anomalous resistivity because of its unique wave characteristics, such as electromagnetic
component, large phase velocity, and small group velocity in the cross current layer direction.
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Wang, Y.; Kulsrud, R. & Ji, H. An Analytic Study of the Perpendicularly Propagating Electromagnetic Drift Instabilities in the Magnetic Reconnection Experiment, report, December 3, 2008; Princeton, New Jersey. (https://digital.library.unt.edu/ark:/67531/metadc926142/m1/3/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.