20.500.12556/RUL-145192 Non-LTE inversion of prominence spectroscopic observations in Hα and Mg II h&k lines We continued our investigation of the plasma characteristics of a quiescent prominence that occurred on 2017 March 30. The prominence was observed simultaneously by several instruments, including the Interface Region Imaging Spectrograph (IRIS) and the Multichannel Subtractive Double Pass (MSDP) spectrograph operating at the Meudon solar tower. We focused on IRIS Mg II h&k and MSDP Hα spectra, selecting 55 well-coaligned points within the prominence. We computed an extensive grid of 63,000 isothermal and isobaric 1D-slab prominence models with a non-LTE (i.e., departures from the local thermodynamic equilibrium) radiative transfer code. We then performed a 1.5D spectral inversion searching for an optimal model that best fits five parameters of the observed profiles (observables), namely, the integrated intensity of the Hα and Mg II k lines, the FWHM of both lines, and the ratio of intensities of the Mg II k and Mg II h lines. The latter is sensitive to temperature. Our results show that the prominence is a low-temperature structure, mostly below 10,000 K, with some excursions to higher values (up to 18,000 K) but also rather low temperatures (around 5000 K). The microturbulent velocity is typically low, peaking around 8 km s$^{−1}$, and electron density values are of the order of 10$^{10}$ cm$^{−3}$. The peak effective thickness is 500 km, although the values range up to 5000 km. The studied prominence is rather optically thin in the Hα line and optically thick in the Mg II h&k lines. solar prominences radiative transfer spectroscopy quiescent solar prominence sončeve protuberance sevalni prenos spektroskopija true false true Angleški jezik Slovenski jezik Članek v reviji 2023-04-13 10:28:23 2023-04-13 10:28:23 2023-04-14 03:49:44 0000-00-00 00:00:00 2022 0 0 12 str. no. 1, art. 3 Vol. 932 Jun. 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 523.9 1538-4357 10.3847/1538-4357/ac6bf5 115353091 Jejcic_2022_ApJ_932_3.pdf Jejcic_2022_ApJ_932_3.pdf 1 7065F11F1E751A059327BAC879CAF075 75fed31294d3fabeb695e739ccfdf2bae2cdf176394d5cbf5cc9141de816b6d1 08ea17bb-d9d6-11ed-a314-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=167907 https://iopscience.iop.org/article/10.3847/1538-4357/ac6bf5 1 02d1d688-d9d5-11ed-a314-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=167906 Pedagoška fakulteta Fakulteta za matematiko in fiziko 0 0 0