Eclipse observations of coronal emission lines. I. [Fex] 6374Å profiles at the eclipse of 16 February 1980

Singh, Jagdev ; Bappu, M. K. V. ; Saxena, A. K. (1982) Eclipse observations of coronal emission lines. I. [Fex] 6374Å profiles at the eclipse of 16 February 1980 Journal of Astrophysics and Astronomy, 3 (3). pp. 249-266. ISSN 0250-6335

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Official URL: http://www.ias.ac.in/jarch/jaa/3/249-266.pdf

Related URL: http://dx.doi.org/10.1007/BF02714865

Abstract

Coronal spectra during the total solar eclipse of 1980 February 16, were obtained in the 6374Å [Fex] line using a multislit spectrograph. These spectra have a dispersion of 2.5 Å mm-1. The observed line profiles from 1.1 to 1.7 R with a spatial resolution of 10 × 22 arcsec2, give half-widths that vary between 0.6 Å and 2.4Å. A large number of locations have half-widths around 1.3 Å corresponding to a temperature of 4.6 × 106 K. If temperature of the order of 1.3 × 106 K are typical of the regions that emit [Fex], then turbulent velocities of ~ 30 km s-1 need to be invoked for the enhanced line broadening. The line-of-sight velocities measured range between +14 km s-1 to -17 km s-1. Most of the locations have velocities less than ±5 km s-1. From these observations we conclude that corona does not show any localized differential mass motion and that it co-rotates with the photospheric layers deeper down.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Solar Corona; Red Coronal Line; Turbulent Velocities; Rotation of Solar Corona
ID Code:37413
Deposited On:23 Apr 2011 09:54
Last Modified:17 May 2016 20:19

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