Assimilating Measurements of the Photospheric Magnetic Field into MHD Models of the Solar Atmosphere

Details Assimilating Measurements of the Photospheric Magnetic Field into MHD Models of the Solar Atmosphere Assimilating Measurements of the Photospheric Magnetic Field into MHD Models of the Solar Atmosphere

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640502a&link_type=abstract

American Astronomical Society, AAS Meeting #216, #405.02; Bulletin of the American Astronomical Society, Vol. 41, p.889

Astronomy and Astrophysics

Astronomy

Scientific paper

We introduce a rudimentary assimilative technique that allows a time series of vector magnetograms to be directly incorporated into the active cells of a RADMHD model of the solar atmosphere. We apply this technique to a simplified large-scale model of NOAA AR-8210, a flare and CME-producing active region. We begin by relaxing an initial magnetic configuration based on the first in a series of IVM vector magnetograms from the Mees Solar Observatory at Haleakala HI. This low-beta, near force-free configuration is achieved by solving the MHD system in the presence of a time-dependent artificial damping that is reduced as the configuration relaxes. Once the magnetic and thermodynamic initial state is achieved, we advance the system using our assimilative technique applied to a 4 hour sequence of IVM magnetograms. In addition, we present a simple 3D MHD simulation of the response of the initial AR-8210 pre-flare model corona to flare energy deposited in the upper chromosphere near a sheared neutral line.

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