Diagnostics of the Prominence Plasma from Hα and Mg II Spectral Observations

0521178 - ASÚ 2020 RIV US eng J - Journal Article
Ruan, G. - Jejčič, S. - Schmieder, B. - Mein, P. - Mein, N. - Heinzel, Petr - Gunár, Stanislav - Chen, Y.
Diagnostics of the Prominence Plasma from Hα and Mg II Spectral Observations.
Astrophysical Journal. Roč. 886, č. 2 (2019), č. článku 134. ISSN 0004-637X. E-ISSN 1538-4357
R&D Projects: GA ČR(CZ) GA19-17102S; GA ČR GA19-16890S
Institutional support: RVO:67985815
Keywords : radiative transfer * filaments * prominences
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.746, year: 2019
Method of publishing: Limited access
https://doi.org/10.3847/1538-4357/ab4b50

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.
Permanent Link: http://hdl.handle.net/11104/0305816