Using global MHD simulations in conjunction with spacecraft observations to determine the large-scale topology of dayside merging

Details Using global MHD simulations in conjunction with spacecraft observations to determine the large-scale topology of dayside merging Using global MHD simulations in conjunction with spacecraft observations to determine the large-scale topology of dayside merging

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm53c..07b&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM53C-07

Physics

7835 Magnetic Reconnection, 7843 Numerical Simulation Studies, 2724 Magnetopause, Cusp, And Boundary Layers, 2753 Numerical Modeling

Scientific paper

We report results from a study that employs three-dimensional magnetohydrodynamic (MHD) in conjunction with ion measurements from POLAR TIMAS and CLUSTER CIS experiments, and images of proton auroras from the IMAGE FUV instrument. Using plasma and magnetic field parameters measured upstream of the bow shock by the ACE spacecraft as input to the simulations, we consider the spacecraft observations in the context of the global topology of the merging as inferred from the simulations. Results indicate that the locations of the merging sites, though distorted, are mostly consistent with merging patterns predicted by the antiparallel merging model. The simulations also indicate that merging occurring at locations inconsistent with the model's predictions can often be explained by multiple merging processes. Such situations occur predominantly when the IMF is northward and has a significant By component. The simulations suggest that during these conditions, merging of the IMF with the Earth field can occur in several steps: first the merging of unconnected magnetosheath with closed field lines in regions expected from the model and then the merging of newly open field lines with either closed field lines or older open field lines in regions depending on the dynamics of the magnetosheath field. The results of the study emphasize the importance of the time evolution of the draping of the magnetosheath field in the global merging process.

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