A Comparison of the Active Region Magnetic Field in the Photosphere and Chromosphere

Details A Comparison of the Active Region Magnetic Field in the Photosphere and Chromosphere A Comparison of the Active Region Magnetic Field in the Photosphere and Chromosphere

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp41b07m&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP41B-07

Physics

7507 Chromosphere, 7524 Magnetic Fields, 7529 Photosphere

Scientific paper

During the Whole Sun Fortnight, the Imaging Vector Magnetograph at Mees Solar Observatory obtained vector magnetic field maps of AR 8299 in the Na-D line (the core of which is formed in the lower chromosphere). At almost the same time, the HAO/NSO Advanced Stokes Polarimeter obtained data in the Fe-I line, formed in the photosphere. We present a comparison of the structures observed in AR 8299's main sunspots on 18 August 1998 at the different atmospheric heights. The data suggest that the Na-D magnetic field maps are formed 2.5 Mm above the Fe-I magnetic field maps. At this height in the atmosphere, the magnetic field is force-free and we will explore the implications of this for the extrapolation of the magnetic field in the corona.

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