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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 5
Ann. Geophys., 27, 1821–1830, 2009
https://doi.org/10.5194/angeo-27-1821-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 1821–1830, 2009
https://doi.org/10.5194/angeo-27-1821-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  04 May 2009

04 May 2009

Three-dimensional simulation of equatorial spread-F with meridional wind effects

J. Krall1, J. D. Huba1, G. Joyce2, and S. T. Zalesak3 J. Krall et al.
  • 1Plasma Physics Division, Naval Research Lab., Code 6790, 4555 Overlook Ave., SW, Washington, D.C., 20375-5000, USA
  • 2Icarus Research, Inc., P. O. Box 30780, Bethesda, MD 20824-0780, USA
  • 3Plasma Physics Division, Naval Research Lab., Code 6730, 4555 Overlook Ave., SW, Washington, D.C., 20375-5000, USA

Abstract. The NRL SAMI3 three-dimensional simulation code is used to examine the effect of meridional winds on the growth and suppression of equatorial spread F (ESF). The simulation geometry conforms to a dipole field geometry with field-line apex heights from 200 to 1600 km at the equator, but extends over only 4 degrees in longitude. The full SAMI3 ionosphere equations are included, providing ion dynamics both along and across the field. The potential is solved in two dimensions in the equatorial plane under a field-line equipotential approximation. By selectively including terms in the potential equation, the reduced growth predicted by Maruyama (1988) and the stabilization predicted by Zalesak and Huba (1991) are separately realized. We find that ESF is stabilized by a sufficiently large constant meridional wind (60 m/s in our example).

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