Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0125b&link_type=abstract
American Astronomical Society, SPD meeting #37, #1.25; Bulletin of the American Astronomical Society, Vol. 38, p.219
Astronomy and Astrophysics
Astronomy
Scientific paper
We measure coronal magnetic field strengths of 1750 G at a height of 8000 km above a large sunspot in NOAA Active Region 10652 at the west solar limb on 2004 July 29 using coordinated observations with the VLA, TRACE, and three instruments (CDS, EIT, MDI) aboard SOHO. This observation is the first time that coronal radio brightness temperatures have been analyzed in a 15 GHz solar radio source projected above the limb. Observations at 8 GHz yield coronal magnetic field strengths of 960 G at a height of 12,000 km. The field strength measurements combine to yield a magnetic scale height of 6900 km. The radio brightness temperature maxima are located away from a sunspot plume that appears bright in EUV line emission formed at temperatures around several hundred thousand K. This work is supported by NASA and NSF.
Brosius Jeffrey W.
White Simon
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