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

      Jagdev Singh M. K. V. Bappu A. K. Saxena

      Volume 3 Issue 3 September 1982 pp 249-266

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/003/03/0249-0266

    • Keywords

       

      Solar corona; red coronal line; turbulent velocities; rotation of solar corona

    • 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.

    • Author Affiliations

       

      Jagdev Singh1 M. K. V. Bappu1 A. K. Saxena1

      1. Indian Institute of Astrophysics, Bangalore - 560034

    • Dates

       
      Published
      September 1982
      Manuscript received
      19 May 1982
      Accepted
      28 June 1982

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