Variation of Polar Coronal Hole Profiles with Solar Cycle

Details Variation of Polar Coronal Hole Profiles with Solar Cycle Variation of Polar Coronal Hole Profiles with Solar Cycle

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ssrv...87..177d&link_type=abstract

Space Science Reviews, v. 87, Issue 1/2, p. 177-180 (1999).

Computer Science

2

Corona, Coronal Holes, Line Profiles

Scientific paper

We compared the H I Lyα polar coronal hole profiles obtained during the three Spartan 201 flights (in 1993, 1994, and 1995) and during the more recent UVCS/SOHO mission. We found that at 2.1 R&sun; there are no significant variations of the line shape over the several years of the descending phase of the solar cycle. However, there may be some evidence for the 1.8 R&sun; profiles being broader towards solar minimum. The profiles at 2.1 R&sun; are different from profiles obtained at 1.8 R&sun;; they have clearly narrower cores and wide wings. We fitted the profiles with single and/or multiple Gaussian functions and calculated their typical 1/e half widths.

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