O VI and H_2 Lines in Sunspots

Details O VI and H_2 Lines in Sunspots O VI and H_2 Lines in Sunspots

2006-11-15

arxiv.org/abs/astro-ph/0611490v2

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures. In press,"Physics of Chromospheric Plasmas" (Coimbra), ASP 368, 247 (2007). Revised version matches publis

Scientific paper

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.

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