Doppler width of spectral lines

Heading: 
1Mamedov, SG, 2Kuli-Zade, DM, 2Alieva, ZF, 1Musaev, MM
1Nasir al-Din al-Tusi Shamakhi Astrophysical Observatory, Pirqulu, Azerbaijan
2Baku State University of Azerbaijan, Baku, Azerbaijan
Kinemat. fiz. nebesnyh tel (Online) 2018, 34(2):76-80
https://doi.org/10.15407/kfnt2018.02.076
Start Page: Notes
Language: Russian
Abstract: 

In this paper, cases of incorrect recording of expressions for the Doppler width of spectral lines by some authors analyzed in detail, resulting in the calculations of these authors of thermal velocities values are inaccurate. As an example it was re-calculated the values of thermal velocities calculated in the article by Patsouracos and Klimchuk [Astrophys. J. 2006. 647. P. 1452]. Calculations showed that the values obtained by the authors of nonthermal velocities are overestimated by 30—40 % compared to the true values.

Keywords: Doppler width, nonthermal velocities
References: 

1.A. V. Zasov and K. A. Postnov, Basic Astrophysics (Mosk. Gos. Univ., Moscow, 2006) [in Russian].

2. Stellar atmospheres, Ed. by J. L. Greenstein (Univ. of Chicago Press, Chicago, 1960; Inostrannaya Literatura, Moscow, 1963).

3.K. A. Postnov and A. V. Zasov, A Course of Basic Astrophysics (Mosk. Gos. Univ., Moscow, 2005) [in Russian].

4.V. V. Sobolev, A Course of Theoretical Astrophysics (Nauka, Moscow, 1967) [in Russian].

5.P. Antolin and R. L. van der Voort., “Observing the fine structure of loops through high-resolution spectroscopic observations of Coronal rain with the Crisp instrument at the Swedish telescope,” Astrophys. J. 745, 152–173 (2012).
https://doi.org/10.1088/0004-637X/745/2/152

6.V. De Pontieu and S. W. McIntosh, “Quasi-periodic propagating signals in the solar corona: the signature of magnetoacoustic waves of high-velocity up flows?,” Astrophys. J. 722, 1913–1029 (2010).
https://doi.org/10.1088/0004-637X/722/2/1013

7.K. P. Dere, J.-D. F. Bartoe, G. E. Brueckner, J. W. Cook, and D. G. Socker, “Discrete subresolution structures in the solar transition zone,” Sol. Phys. 114, 223–237 (1987).
https://doi.org/10.1007/BF00167342

8.K. P. Dere and H. E. Mason, “Nonthermal velocities in the solar transition zone observed with the high-resolution telescope and spectrograph,” Sol. Phys. 144, 217–229 (1993).
https://doi.org/10.1007/BF00627590

9.R. A. Harrison, A. W. Hood, and C. D. Pike, “Off-limb EUV line profiles and the search for wave activity in the low corona,” Astron. Astrophys. 392, 319–327 (2002).
https://doi.org/10.1051/0004-6361:20021189

10.N. Konjevic, M. S. Dirnitrijevic, and W. L. Wiese, “Experimental stark widths and shifts for spectral lines of neutral atoms (A critical review of selected data for the period 1976 to 1982),” J. Phys. Chem. Ref. Data 13, 619–632 (1984).
https://doi.org/10.1063/1.555715

11.K. G. McClements, R. A. Harrison, and D. Alexander, “The detection of wave activity in the solar corona using UV line spectra,” Sol. Phys. 131, 41–48 (1991).
https://doi.org/10.1007/BF00151742

12.E. O’Shea, D. Banerjee, and S. Poedts, “Variation of coronal line widths on and of the disk,” Astron. Astrophys. 400, 1065–1070 (2003).
https://doi.org/10.1051/0004-6361:20030060

13.S. Patsouracos and J. A. Klimchuk, “Nonthermal spectral line broadening and the nanoflare model,” Astrophys. J. 647, 1452–1465 (2006).
https://doi.org/10.1086/505517

14.W. J. M. Rankine, “On the thermodynamic theory of waves of finite longitudinal disturbance,” Philos. Trans. R. Soc. London A 160, 277–291 (1870).
https://doi.org/10.1098/rstl.1870.0015

15.E. Verwichte, M. Marsh, C. Foullon, T. Van Doosselaere, I. De Moortel, A. W. Hood, and V. M. Nakariakov, “Periodic spectral line asymmetries in solar coronal structures from slow magnetoacoustic waves,” Astrophys. J., Lett. 724, L194–L198 (2010).
https://doi.org/10.1088/2041-8205/724/2/L194

16.T. Zaqarashvili, “Spectral line non-thermal broadening and MHD in the solar corona,” AIP Conf. Proc. 1121, 114–122 (2009).
https://doi.org/10.1063/1.3137929

17.G. Q. Zhao, D. J. Wu, and C. B. Wang, “A study of line widths and kinetic parameters of ions in the solar corona,” Astrophys. and Space Sci. 353, 373–378 (2014).
https://doi.org/10.1007/s10509-014-2072-y