Physics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30d..14g&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 4, pp. 14-1, CiteID 1165, DOI 10.1029/2002GL016437
Physics
4
Ionosphere: Ionospheric Irregularities, Ionosphere: Ionospheric Dynamics, Ionosphere: Plasma Convection, Ionosphere: Auroral Ionosphere (2704), Ionosphere: Ionospheric Disturbances
Scientific paper
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.
David Marc
Gondarenko N. A.
Guzdar Parvez N.
Sojka Jan J.
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