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Observed IRIS Profiles of the h and k Doublet of Mg II and Comparison with Profiles from Quiescent Prominence NLTE Models
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SYSNO ASEP 0461290 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Observed IRIS Profiles of the h and k Doublet of Mg II and Comparison with Profiles from Quiescent Prominence NLTE Models Author(s) Vial, J. C. (FR)
Pelouze, G. (FR)
Heinzel, Petr (ASU-R) RID, ORCID
Kleint, L. (CH)
Anzer, U. (DE)Source Title Solar Physics. - : Springer - ISSN 0038-0938
Roč. 291, č. 1 (2016), s. 67-87Number of pages 21 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords Mg II lines ; non-LTE diagnostic ; Sun prominences Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics Institutional support ASU-R - RVO:67985815 UT WOS 000372878100005 EID SCOPUS 84952629938 DOI 10.1007/s11207-015-0820-y Annotation We aim at comparing unique observations obtained in the Mg II h and k lines of a polar crown prominence with the radiative outputs from one-dimensional models built with non-local-thermodynamic equilibrium codes. We characterize the profiles obtained through thorough calibration procedures, with attention paid to the absolute values, full-width at half-maximum, and the ratio of k to h intensities. We also show that at the top of some structures, line-of-sight velocities of about 9 kms(-1) can be detected. We find a range of static, low-pressure, low-thickness, low-temperature models that could fit k or h observed values, but that cannot satisfy the low observed k/h ratio. We investigate whether these low values might be explained by the inclusion of horizontal flows in small-scale threads. These flows are also necessary in another class of models, where the pressure is kept low but thickness and temperature are increased up to the observed thickness and up to 15000 K. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2017
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