Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.confr..69h&link_type=abstract
Harvard-Smithsonian Center for Astrophysics, International Solar Wind 8 Conference, p. 69
Astronomy and Astrophysics
Astrophysics
Coronal Holes, Plasma Temperature, Iron Isotopes, Coronagraphs, Line Of Sight, Line Spectra, Temperature Gradients
Scientific paper
The difficulty in establishing the temperature structure and temperature gradient within coronal holes from limb observations is due to the frequent veiling of coronal holes by hotter and denser quiet regions often surrounding them and shaping their boundaries. Nevertheless probing the coronal hole medium itself can be made with a judicious choice of spectral lines. We show how a set of visible forbidden Fe lines, namely Fe IX 3801, Fe X 6374 and Fe Xl 7892 A which are sensitive to plasma temperatures less than or equal to 106 K can achieve this purpose. We propose to use these lines in a coordinated manner with coronagraph observations. In addition observations made with the Fe XIV 5303 A line should yield information about any hot material intercepting the line of sight. The proposed combination of these Fe lines offers a very powerful diagnostic tool for coronal hole temperatures and structures.
Brickhouse Nancy
Esser Ruth
Rifai Habbal Shadia
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