Three-dimensional Mapping of the Lower Corona and Transition Region

Details Three-dimensional Mapping of the Lower Corona and Transition Region Three-dimensional Mapping of the Lower Corona and Transition Region

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0704t&link_type=abstract

American Astronomical Society, SPD meeting #42, #7.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Numerous studies have shown that temperature in the solar atmosphere rises abruptly from chromospheric to coronal values through a spatially thin transition region. Through the use of a novel method by which to obtain three-dimensional temperature and magnetic field strength maps of the lower corona and transition region from microwave observations [Tun, Gary & Georgoulis, 2011, ApJ 728, 1], a region of relatively cool material is found to extend to greater heights over the sunspot's umbra than in surrounding regions. While previous studies have occasionally pointed toward the existence of such material, this mapping represents a direct observation of this feature and of its three dimensional distribution above the sunspot. This distribution, in turn, has a direct application to the investigation of heat distribution in the higher corona, as evidence is presented that temperatures in different loop systems are correlated to the location of their footpoints in the sunspot. The mapping method itself also represents a test of the accuracy of magnetic field extrapolations.
This work was supported in part by NSF grants AGS-0961867, AST-0908344, and NASA grants NNX10AF27G and NNX11AB49G to New Jersey Institute of Technology.

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