Empirically Constrained Multidimensional MHD Model for the Solar Corona and Solar Wind

Details Empirically Constrained Multidimensional MHD Model for the Solar Corona and Solar Wind Empirically Constrained Multidimensional MHD Model for the Solar Corona and Solar Wind

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh21a0502s&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH21A-0502

Physics

2134 Interplanetary Magnetic Fields, 2164 Solar Wind Plasma, 7509 Corona, 7524 Magnetic Fields, 7843 Numerical Simulation Studies

Scientific paper

We are developing a time stationary self-consistent 2D MHD model of the solar corona and solar wind that explicitly solves the energy equation, using a semi-empirical 2D MHD model of the corona to provide an empirically determined effective heat flux qeff (i.e., the term effective means the possible presence of wave contributions) for the energy equation and effective pressure Peff for the momentum equation. Preliminary results indicated that in order to achieve high speed winds over the poles we not only needed to use qeff in the energy equation, but also needed to include the empirically determined effective pressure Peff as a constraint in the momentum equation, which means that momentum addition by waves above 2 RS are required to produce high speed winds. A solution which only included qeff showed high acceleration over the poles below 2 RS, but then drooped above that radial distance indicating we needed momentum addition above that height to get high speed flows over the poles. We will show new results which include the added constraint of Peff in the momentum equation. This method will allows us to estimate the momentum addition term due to waves as a function of height and latitude within the corona. The estimates of Peff and qeff come from the semi-empirical 2D MHD model of the solar corona by Sittler and Guhathakurta (1999, 2002) which is based on Mk-III, Skylab and Ulysses observations. For future model development we plan to use SOHO LASCO, CDS, EIT, UVCS, Spartan 201-05 and Ulysses data as constraints for our model calculations. The model by Sittler and Guhathakurta (1999, 2002) is not a self-consistent calculation. The calculations presented here are a continuing effort to provide a self-consistent calculation based on empirical constraints.

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