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- Title
Temperature of Polar Corona of the Sun According to Kislovodsk Observations During 1957–2002.
- Authors
Makarov, V. I.; Tlatov, A. G.; Callebaut, D. K.
- Abstract
We continued a study of the long-term variations of temperature in the solar corona at all latitudes (Makarov, Tlatov, and Callebaut, 2002a). The series of the green (Fe xiv 530.3 nm; KI5303) and red (Fe x 637.4 nm; KI6374) coronal intensities for 1957–2002 has been obtained using the coronal observations at the Kislovodsk Solar Station. The mean monthly coronal intensities have been calculated at all latitudes (0–90˚) and in the high latitude (45–90˚) zones. It was found that the value of KI6374/KI5303increased about 2.0 times at the high latitudes during the last 45 years. This corresponds to a decrease of the average temperature by 0.1 ×106K of the polar corona. We suppose that a polar decrease of coronal temperature is connected with an increase of the area of polar zones A PZoccupied by unipolar magnetic fields (Makarov et al., 2002) and, probably, with an increase of the area of polar coronal holes. The maximum ratio KI6374/KI5303is observed during the minimum sunspot activity.
- Subjects
SOLAR corona; SUNSPOTS; SOLAR activity; LATITUDE; CORONAL holes; SPHERICAL astronomy
- Publication
Solar Physics, 2006, Vol 237, Issue 1, p201
- ISSN
0038-0938
- Publication type
Article
- DOI
10.1007/s11207-006-1680-2