NDLI: Temperature of Polar Corona of the Sun According to Kislovodsk Observations During 1957

Content Provider	Springer Nature Link
Author	Makarov, V. I. Tlatov, A. G. Callebaut, D. K.
Copyright Year	2006
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; KI$_{5303}$) and red (Fe x 637.4 nm; KI$_{6374}$) 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 KI$_{6374}$/KI$_{5303}$increased 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 ×10$^{6}$K 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 $_{PZ}$occupied by unipolar magnetic fields (Makarov et al., 2002) and, probably, with an increase of the area of polar coronal holes. The maximum ratio KI$_{6374}$/KI$_{5303}$is observed during the minimum sunspot activity.
Starting Page	201
Ending Page	210
Page Count	10
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	237
Issue Number	1
e-ISSN	1573093X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy, Astrophysics and Cosmology Astronomy Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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