Diagnostics of the Prominence Plasma from Hα and Mg ii Spectral Observations
Ruan,Guiping1,2,3; Jej?i?,Sonja4,5,6; Schmieder,Brigitte2; Mein,Pierre2; Mein,Nicole2; Heinzel,Petr6; Gunár,Stanislav2,6; Chen,Yao1
Source PublicationThe Astrophysical Journal
AbstractAbstract The goal of this paper is to derive the physical conditions of the prominence observed on 2017 March 30. To do so, we use a unique set of data in Mg ii lines obtained with the space-borne Interface Region Imaging Spectrograph (IRIS) and in Hα line with the ground-based Multi-Channel Subtractive Double Pass spectrograph operating at the Meudon solar tower. Here, we analyze the prominence spectra of Mg ii h and k lines, and the Hα line in the part of the prominence which is visible in both sets of lines. We compute a grid of 1D NLTE (i.e., departures from the local thermodynamical equilibrium) models providing synthetic spectra of Mg ii k and h, and Hα lines in a large space of model input parameters (temperature, density, pressure, and microturbulent velocity). We compare Mg ii and Hα line profiles observed in 75 positions of the prominence with the synthetic profiles from the grid of models. These models allow us to compute the relationships between the integrated intensities and between the optical thickness in Hα and Mg ii k lines. The optical thickness τHα is between 0.05 and 2, and is between 3 and 200. We show that the relationship of the observed integrated intensities agrees well with the synthetic integrated intensities for models with a higher microturbulence (16 km s?1) and T around 8000 K, ne?=?1.5?×?1010 cm?3, p?=?0.05 dyne. In this case, large microturbulence values could be a way to take into account the large mixed velocities existing in the observed prominence.
Keywordradiative transfer Sun: filaments, prominences techniques: imaging spectroscopy
WOS IDIOP:0004-637X-886-2-ab4b50
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, and Institute of Space Sciences, Shandong University, Weihai 264209, People's Republic of China;
2.LESIA, Observatoire de Paris, PSL Research University, CNRS Sorbonne Université, Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, F-92195 Meudon, France
3.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China
4.Faculty of Education, University of Ljubljana, Kardeljeva plo??ad 16,1000 Ljubljana, Slovenia
5.Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
6.Astronomical Institute, The Czech Academy of Sciences, 25165 Ond?ejov, Czech Republic
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
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GB/T 7714
Ruan,Guiping,Jej?i?,Sonja,Schmieder,Brigitte,et al. Diagnostics of the Prominence Plasma from Hα and Mg ii Spectral Observations[J]. The Astrophysical Journal,2019,886(2).
APA Ruan,Guiping.,Jej?i?,Sonja.,Schmieder,Brigitte.,Mein,Pierre.,Mein,Nicole.,...&Chen,Yao.(2019).Diagnostics of the Prominence Plasma from Hα and Mg ii Spectral Observations.The Astrophysical Journal,886(2).
MLA Ruan,Guiping,et al."Diagnostics of the Prominence Plasma from Hα and Mg ii Spectral Observations".The Astrophysical Journal 886.2(2019).
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