ROSES ID: NNH08ZDA001N Selection Year: 2009
Program Element: Focused Science Topic
Principal Investigator: Amitava Bhattacharjee
Affiliation(s): University of New Hampshire
Project Member(s):
Germaschewski, Kai Co-I University of New Hampshire
Raeder, Joachim Co-I University of New Hampshire
Dorelli, John Charles Co-I NASA GSFC
Chacon, Luis Collaborator Oak Ridge National Laboratory
Summary:
Global MHD models of the Earth's magnetosphere have been very successful in simulating large-scale aspects of magnetospheric dynamics. However, a well known deficiency of global MHD models is their inability to model fast magnetic reconnection in the high-Lundquist-number limit. Recent advances in collisionless reconnection theory, governed by a generalized Ohm's law, demonstrate that the Hall current and electron pressure can realize regimes of fast reconnection. The principal objective of this proposal is to develop HallGGCM, an improved global multi-scale model of the Earth's magnetosphere, and to investigate multi-scale dynamics involving collisionless reconnection at the dayside magnetopause and substorm onset in the magnetotail. HallGGCM builds on the foundation of OpenGGCM, which is a global model of Earth's space environment, and is based on the resistive MHD equations. The principal changes are the replacement of the resistive MHD equations by the Hall MHD equations. This will require us to modify the underlying numerical discretization for OpenGGCM. Development of HallGGCM will take the mature framework of an existing global model of the Earth's magnetosphere (OpenGGCM) and take it to the next step where the model will have the ability to couple large-scale magnetospheric dynamics to a more sophisticated and physically realistic description of the smaller scales where non-MHD, collisionless effects play an extremely important role. Using HallGGCM, we will:Performance Year | Reference | Actions |
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1 | Germaschewski, K.; Raeder, J.; Larson, D. J.; Bhattac... | |
1 | Sullivan, B. P.; Bhattacharjee, A.; Dorelli, J.; Germ... | |
1 | Maynard, K.; Germaschewski, K.; Raeder, J.; Bhattachar... | |
1 | Lin, L.; Germaschewski, K.; Bhattacharjee, A.; Maynard... | |
1 | Germaschewski, K.; Raeder, J.; Bhattacharjee, A.; Lin,... |