Volume 431, Number 3, March I 2005
|Page(s)||1069 - 1073|
|Published online||16 February 2005|
Solar prominences with Na and Mg emissions and centrally reversed Balmer lines
Institut d'Astrophysique (CNRS), 98bis Bd. Arago, 75014 Paris, France
2 Universitäts-Sternwarte, Geismarlandstraße 11, 37083 Göttingen, Germany e-mail: email@example.com
Accepted: 14 October 2004
We observed bright solar limb prominences with significant emission of NaD2 and Mgb2 simultaneously with the Hα, Hβ, HeD3, He+4685, and the Hesingl 5015 Å lines, using the THEMIS telescope on Tenerife. We find that most prominences with significant NaD2 and Mgb2 emissions show pronounced centrally reversed Hα profiles, and occasionally even of Hβ; the strongest emissions reach integrated intensities [ erg/(cm2 s str)] . The centrally reversed profiles are well reproduced by semi-infinite models. The source function reaches S [ erg/(cm2 s str Å)] corresponding to an excitation temperature K; here, the optically thickness of Hα amounts . The line widths of the NaD2, Mgb2, and HeD3 profiles yield kinetic temperatures K and non-thermal broadening km s-1.
Key words: Sun: prominences / radiation mechanisms: non-thermal / line: formation
© ESO, 2005
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