Abstract
A pictorial explanation for shear-Hall instability is suggested and shows that the shear flow is not necessary for the instability because its role can be played by the Hall effect of an inhomogeneous backgroundmagnetic field. Linear stability analysis for a simplemodel of magnetic field varying periodically in space confirms such a “double Hall” instability. Numerical computations show a considerable increase in Ohmic dissipation rate at the nonlinear stage of instability development. Field dissipation has a spiky character associated with magnetic reconnection in current sheets and X-points. Double Hall instability can be significant for magnetic field dissipation in neutron star crusts and, possibly, in the solar corona.
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Original Russian Text © L.L. Kitchatinov, 2017, published in Pis’ma v Astronomicheskii Zhurnal, 2017, Vol. 43, No. 9, pp. 687–697.
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Kitchatinov, L.L. Double Hall instability: A catalyzer of magnetic energy release. Astron. Lett. 43, 624–633 (2017). https://doi.org/10.1134/S1063773717090043
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DOI: https://doi.org/10.1134/S1063773717090043