Analysis of a Flare Producing Active Region Using Data from the Upgraded OVSA

Details Analysis of a Flare Producing Active Region Using Data from the Upgraded OVSA Analysis of a Flare Producing Active Region Using Data from the Upgraded OVSA

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0117t&link_type=abstract

American Astronomical Society, SPD meeting #37, #1.17; Bulletin of the American Astronomical Society, Vol. 38, p.218

Astronomy and Astrophysics

Astronomy

Scientific paper

The Owens Valley Solar Array (OVSA) provides spectral imaging data in the microwave radio range, 1-18 GHz. In August 2004, work was completed on adding two 2-m antennas to the existing array, for a total of seven elements. In addition, the five 2-m antennas were upgraded to record right and left circular polarization, a feature previously available only on the two 27-m dishes. The increased number of baselines improves the instrument's imaging capability and, thus, allows a more accurate analysis of solar features. We have embarked on a project to study active regions that were well observed by OVSA from August 2004 through the end of 2005. This poster concentrates on the period in September 2005 when NOAA active region AR 10808 crossed the disk (and produced several strong flares). The present work is an analysis of the AR 10808's structure during non-flaring times in order to determine coronal parameters such as temperature, magnetic field strength, and column emission measure by means of the radio brightness temperature spectra obtained from radio maps of the region. Polarization information is used to determine these parameters more precisely, using the magnetic-field-induced polarization as a constraint. The results are compared to those inferred from concurrent observations by BBSO and MDI. This is part of a work in progress to make similar analyses of the active region over several days in order to determine changes in the active region structure around flare times, as well as changes in the active region during its passage across the solar disk.

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