Broadening of Fe X (6374 Å) profiles above the limb in a coronal hole |
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| Authors: | D M Hassler T G Moran |
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| Institution: | (1) Harvard-Smithsonian Center for Astrophysics, 02138 Cambridge, MA, USA;(2) NASA Goddard Space Flight Center, 20771 Greenbelt, MD, USA;(3) Present address: High Altitude Observatory/NCAR, Boulder, 80307 Boulder, CO, USA |
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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. |
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| Keywords: | Solar corona Coronal holes Solar wind UV spectroscopy |
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