O VI and H_2 Lines in Sunspots
Abstract
Sunspots are locations on the Sun where unique atmospheric conditions prevail. In particular, the very low temperatures found above sunspots allow the emission of H_2 lines. In this study we are interested in the radiation emitted by sunspots in the O VI lines at 1031.96 A and 1037.60 A. We use SOHO/SUMER observations of a sunspot performed in March 1999 and investigate the interaction between the O VI lines and a H_2 line at 1031.87 A found in the Werner band. The unique features of sunspots atmospheres may very well have important implications regarding the illumination of coronal O+5 ions in the low corona, affecting our interpretation of Doppler dimming diagnostics.
Cite
@article{arxiv.astro-ph/0611490,
title = {O VI and H_2 Lines in Sunspots},
author = {Nicolas Labrosse and Huw Morgan and Shadia Rifai Habbal and Daniel Brown},
journal= {arXiv preprint arXiv:astro-ph/0611490},
year = {2007}
}
Comments
4 pages, 4 figures. In press,"Physics of Chromospheric Plasmas" (Coimbra), ASP 368, 247 (2007). Revised version matches published version.