Relationship between Line Shift and Intensity Inside Coronal Holes

Details Relationship between Line Shift and Intensity Inside Coronal Holes Relationship between Line Shift and Intensity Inside Coronal Holes

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..633s&link_type=abstract

8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel

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Scientific paper

We analyse SUMER spectra of a group of lines belonging to chromospheric, transition region and coronal ions obtained on both sides of the boundary of polar coronal holes as well as at other locations along the limb. We study the relationship between line shifts and intensities in coronal holes and compare to values obtained in the quiet Sun. We find that within coronal holes, a trend can be detected in some transition region lines, like O V and N V, in the sense that the lines are more strongly blueshifted in brighter regions. This is in agreement with the conclusion reached by Hassler et al. (1999, Science 283, 810-813) that the fast solar wind emanates from the network. Furthermore, a correlation of line shifts of ions formed at higher temperatures (Ne VIII, Fe XII) with intensities of lines showing network structures (Si I, N III) is presented.

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