Coronal Hole Properties Observed with Sumer |
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| Authors: | K Stucki SK Solanki I Rüedi JO Stenflo A Brković U Schühle K Wilhelm MCE Huber |
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| Institution: | (1) Institute of Astronomy, ETH-Zentrum, CH-8092 Zürich, Switzerland;(2) Max-Planck-Institut für Aeronomie, D-37191 Katlenburg-Lindau, Germany;(3) European Space Agency, Space Science Department, ESTEC, PO Box 299, 2200 AG Nordwijk, The Netherlands |
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| Abstract: | We analyze SUMER spectra of 14 lines belonging to 12 ions, obtained on both sides of the boundary of polar coronal holes as
well as at other locations along the limb. We compare line intensities, shifts and widths in coronal holes with values obtained
in the quiet Sun. We find that with increasing formation temperature, spectral lines show an increasingly stronger blueshift
in coronal holes relative to the quiet Sun at an equal heliospheric angle. The width of the lines is generally larger (by
a few km/s) inside the coronal hole. Intensity measurements show the presence of the coronal hole in Ne VIII lines as well
as in Fe XII, with evidence for a slightly enhanced emission in polar coronal holes for lines formed below 105 K.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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