ISSN:
1572-9672
Keywords:
corona
;
coronal holes
;
line profiles
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract 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⊙ 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⊙ profiles being broader towards solar minimum. The profiles at 2.1 R⊙ are different from profiles obtained at 1.8 R⊙; 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1005171728767