Bow Shock Configurations as Affected by Planetary Dipole Tilt under Intermediate MHD Solar Wind Conditions

Details Bow Shock Configurations as Affected by Planetary Dipole Tilt under Intermediate MHD Solar Wind Conditions Bow Shock Configurations as Affected by Planetary Dipole Tilt under Intermediate MHD Solar Wind Conditions

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51a1612c&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM51A-1612

Physics

2700 Magnetospheric Physics (6939), 2723 Magnetic Reconnection (7526, 7835), 2728 Magnetosheath, 2731 Magnetosphere: Outer, 2753 Numerical Modeling

Scientific paper

Previous numerical MHD studies have shown that MHD shocks formed from the interaction of a planetary magnetosphere with the solar wind under intermediate MHD shock conditions show a marked north-south asymmetry in shock characteristics (Cable, S., Lin, Y., and Holloway, J.L. (2007), JGR, 112, A09202). This asymmetry is the result of very different magnetic reconnection patterns in the northern and southern hemispheres. Specifically, under intermediate shock conditions, the solar wind magnetic field is very nearly sunward or anti-sunward and will, therefore, be nearly parallel to the planetary field at one pole, producing little magnetic reconnection there, and nearly anti-parallel to the planetary field at the opposite pole, where substantial magnetic reconnection can take place. Intermediate bow shocks are therefore quite novel compared to standard MHD fast shocks in that disturbances generated down stream at the poles can propagate upstream to the shock and affect the overall shock configuration. This immediately raises the question of how the tilt of the dipole of the planetary magnetic field might affect the configuration of a bow shock under intermediate shock conditions. We use MHD numerical studies to examine how the bow shock configuration is affected over a wide range of dipole tilt angles. We have employed two codes in this investigation: our own code that was used in the original examination of intermediate shocks with planetary magnetospheres, and the OpenGGCM, developed by Joachim Raeder and Timothy Fuller-Rowell, and available in the Community Coordinated Modeling Center "Runs on Request" system (http://ccmc.gsfc.nasa.gov). Though differences are visible in the results of the two codes, both codes show that dipole tilt has significant affects on the bow shock configuration. Similarities and differences in the results will be discussed.

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