Coronal Holes and Solar Wind

Space Science Reviews

, Volume 70, Issue 1, pp 373-377

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

  • D. M. HasslerAffiliated withHarvard-Smithsonian Center for Astrophysics
  • , T. G. MoranAffiliated withNASA Goddard Space Flight Center

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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