Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...3e..53l&link_type=abstract
Solar Active Regions and 3D Magnetic Structure, 26th meeting of the IAU, Joint Discussion 3, 16-17 August, 2006, Prague, Czech R
Physics
Scientific paper
Measuring the magnetic field in solar active regions in all spatial and temporal dimensions is a long-standing and ambitious goal in solar physics. As the locations of complex and rapidly evolving magnetic fields and the source of geo-effective energetic events, understanding active region magnetic field generation and evolution is extremely an important goal; however, basic physics presents great challenges to achieving it. Measuring the chromospheric magnetic field in active regions is an important first step beyond routine photospheric measurements; important both for basic understanding of active region structure but also for the many ramifications coming from chromosphere being closer to a force-free state than the photosphere. However, it is also a very difficult measurement. In this talk I will describe highlights of our group's on-going efforts to understand solar active region magnetic field structure via direct observation of the vector chromospheric magnetic field. Since late 2003, the U. Hawai`i/Mees Solar Observatory's Imaging Vector Magnetograph has routinely acquired spectropolarimetry measurements of active regions across the Na-I 589.6nm line; from the polarization at the line's near-wings approximately 0.007nm from line center we deduce the vector magnetic field. The data are specific to active regions, specifically the structure, free energy storage and evolution at that low-chromospheric layer. I will present recent results from these chromospheric data with a focus on the differences between the photosphere and chromosphere, and the free energy storage in solar active regions.
Barnes Graham
Leka Kimberly Dawn
Metcalf Thomas R.
Mickey Donald L.
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