O VI and H2 lines in sunspots

Labrosse, N., Morgan, H., Habbal, S.-R. and Brown, D.J. (2007) O VI and H2 lines in sunspots. In: Heinzel, P., Dorotovic, I. and Rutten, R.J. (eds.) The Physics of Chromospheric Plasmas: Proceedings of the Coimbra Solar Physics Meeting Held at the University of Coimbra, Coimbra, Portugal, 9-13 October, 2006. Series: Astronomical Society of the Pacific conference series (368). Astronomical Society of the Pacific: San Francisco, USA, pp. 247-250. ISBN 9781583812365

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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<sub>2</sub> 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<sub>2</sub> 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.

Item Type:Book Sections
Glasgow Author(s) Enlighten ID:Labrosse, Dr Nicolas
Authors: Labrosse, N., Morgan, H., Habbal, S.-R., and Brown, D.J.
Subjects:Q Science > QB Astronomy
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Publisher:Astronomical Society of the Pacific

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