Twisting and Bending of the Geomagnetic Tail under Northward IMF: OpenGGCM Simulations and Predictions for ARTEMIS

Details Twisting and Bending of the Geomagnetic Tail under Northward IMF: OpenGGCM Simulations and Predictions for ARTEMIS Twisting and Bending of the Geomagnetic Tail under Northward IMF: OpenGGCM Simulations and Predictions for ARTEMIS

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51b2099r&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM51B-2099

Physics

[2744] Magnetospheric Physics / Magnetotail, [2748] Magnetospheric Physics / Magnetotail Boundary Layers, [2764] Magnetospheric Physics / Plasma Sheet

Scientific paper

The structure of the geomagnetic tail under northward IMF conditions has long been controversial. Various global magnetosphere models predict either a closed tail of relatively short extent or a tail that still contains some open flux but mostly closed flux that extends hundreds of RE down tail. A fortuitous encounter of the Wind spacecraft 125 RE down tail during a 32 hour interval of nearly constant northward IMF occurred October 22-24, 2003 (Oieroset et al., JGR, 113, A04206, 2008). While the observations confirmed the presence of a tail, the plasma parameters were unusual. OpenGGCM simulations agreed fairly well with the observations and showed a severely flattened and twisted tail. However, the single point observations were not sufficient to constrain the model. The pair of ARTEMIS satellites, which have just entered lunar orbit, will provide much more powerful constraints. In this paper we present predictions of the tail structure at lunar orbit as they are expected to be seen by ARTEMIS. We will consider several scenarios of IMF and solar wind conditions, and where appropriate, we will compare simulation results with ARTEMIS data.

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