On the Dynamic Nature of a Quiescent Prominence Observed by IRIS and MSDP Spectrographs

0498929 - ASÚ 2019 RIV US eng J - Journal Article
Ruan, G. - Schmieder, B. - Mein, P. - Mein, N. - Labrosse, N. - Gunár, Stanislav - Chen, Y.
On the Dynamic Nature of a Quiescent Prominence Observed by IRIS and MSDP Spectrographs.
Astrophysical Journal. Roč. 865, č. 2 (2018), č. článku 123. ISSN 0004-637X. E-ISSN 1538-4357
R&D Projects: GA ČR(CZ) GA16-17586S; GA ČR(CZ) GA16-18495S
Institutional support: RVO:67985815
Keywords : solar prominences * threads * hinode
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.580, year: 2018

Quiescent solar prominences are generally considered to have a stable large-scale structure. However, they consist of multiple small-scale structures that are often significantly dynamic To understand the nature of prominence plasma dynamics we use the high spatial, temporal, and spectral resolution observations obtained by Interface Region Imaging Spectrograph (IRIS) during a coordinated campaign with the Multichannel Subtractive Double Pass spectrograph at the Meudon Solar Tower. Detailed analysis of the IRIS observations of Mg II lines, including the analysis of Dopplershift and line width obtained with two different methods (quantile method and Gaussian-fit method) are discussed in the frame of the dynamic nature of the structures. Large-scale coherent blueshift and redshift features are observed in Mg II lines and Ha exhibiting a slow evolution during 1:40 hr of observations. We explain the presence of several significantly asymmetric peaks in the observed Mg II line profiles by the presence of several prominence fine structures moving with different velocities located along the line of sight (LOS). In such a case, the decrease of the intensity of individual components of the observed spectra with the distance from the central wavelength can be explained by the Doppler dimming effect. We show that C II line profiles may be used to confirm the existence of multi-components along the LOS.
Permanent Link: http://hdl.handle.net/11104/0291215