Space Science Reviews

, Volume 70, Issue 1–2, pp 373–377

Broadening of Fe X (6374 Å) profiles above the limb in a coronal hole

  • D. M. Hassler
  • T. G. Moran
Coronal Holes and Solar Wind

Abstract

Profiles of the visible Fe X (6374 Å) coronal emission line as a function of height above the limb were obtained out to 1.16 solar radii in a coronal hole using the NSO/Sacramento Peak Observatory Coronagraph, Universal Spectrograph and a CCD camera. These are the first coronal line profiles obtained as a function of height in a coronal hole from the ground. Analysis of the line widths suggests a large component of nonthermal broadening which increases with height ranging from 40 to 60 km/s, depending upon the assumed temperature or thermal component of the profile.

Key words

Solar corona Coronal holes Solar wind UV spectroscopy 

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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • D. M. Hassler
    • 1
  • T. G. Moran
    • 2
  1. 1.Harvard-Smithsonian Center for AstrophysicsCambridgeUSA
  2. 2.NASA Goddard Space Flight CenterGreenbeltUSA
  3. 3.High Altitude Observatory/NCAR, BoulderBoulderUSA

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