Comparison of Polar and Equatorial Coronal Holes Observed by UVCS/SOHO: Geometry and Physical Properties |
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Authors: | D Dobrzycka A Panasyuk L Strachan J Kohl |
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Institution: | (1) Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA |
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Abstract: | We analyzed UVCS/SOHO data and compared the H I Lyα (121.6 nm) and O VI (103.2 nm, 103.7 nm) emission in the polar and equatorial
coronal holes. We found that the emission lines have similar characteristics in these two types of coronal holes. Both types
show evidence for superradially diverging boundaries. The latitudinal distribution of the O VI line ratio may indicate that
the equatorial coronal hole has O+5 outflow velocities lower than in the polar coronal holes.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | corona coronal holes solar wind plasma physics line profiles |
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