Structuring of high latitude plasma patches with variable drive

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Abstract

Three-dimensional nonlinear simulations of the structuring of high-latitude patches with variable drive demonstrate the role of the gradient drift instability as the primary operative structuring mechanism. In this letter we show that by introducing a variable convective E × B drive obtained from the ionosphere module of a global MHD code simulation of a real substorm [Sojka et al., 1997], the nature of the structuring is strongly influenced by the drive. In fact, due to occasional reversal of the direction of the convection, the structuring from the gradient-drift instability takes place on both edges of the patch. Using different ion-neutral collisionality to account for the seasonal or solar cycle variability of the ionosphere, the four categories of structured patches identified by Kivanç and Heelis [1997] have been simulated.

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Gondarenko, N. A., Guzdar, P. N., Sojka, J. J., & David, M. (2003). Structuring of high latitude plasma patches with variable drive. Geophysical Research Letters, 30(4). https://doi.org/10.1029/2002GL016437

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