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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 25, issue 6
Ann. Geophys., 25, 1345–1358, 2007
https://doi.org/10.5194/angeo-25-1345-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 25, 1345–1358, 2007
https://doi.org/10.5194/angeo-25-1345-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  29 Jun 2007

29 Jun 2007

A global MHD simulation of an event with a quasi-steady northward IMF component

V. G. Merkin1, J. G. Lyon2, B. J. Anderson3, H. Korth3, C. C. Goodrich1, and K. Papadopoulos4 V. G. Merkin et al.
  • 1Center for Space Physics, Boston University, Boston, MA, USA
  • 2Department of Physics and Astronomy, Dartmouth College, Hanover, NH, USA
  • 3The Johns Hopkins University, Applied Physics Laboratory, Laurel, MD, USA
  • 4Department of Astronomy, University of Maryland, College Park, MD, USA

Abstract. We show results of the Lyon-Fedder-Mobarry (LFM) global MHD simulations of an event previously examined using Iridium spacecraft observations as well as DMSP and IMAGE FUV data. The event is chosen for the steady northward IMF sustained over a three-hour period during 16 July 2000. The Iridium observations showed very weak or absent Region 2 currents in the ionosphere, which makes the event favorable for global MHD modeling. Here we are interested in examining the model's performace during weak magnetospheric forcing, in particular, its ability to reproduce gross signatures of the ionospheric currents and convection pattern and energy deposition in the ionosphere both due to the Poynting flux and particle precipitation. We compare the ionospheric field-aligned current and electric potential patterns with those recovered from Iridium and DMSP observations, respectively. In addition, DMSP magnetometer data are used for comparisons of ionospheric magnetic perturbations. The electromagnetic energy flux is compared with Iridium-inferred values, while IMAGE FUV observations are utilized to verify the simulated particle energy flux.

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