Temperature of Polar Corona of the Sun According to Kislovodsk Observations During 1957–2002 |
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Authors: | V I Makarov A G Tlatov D K Callebaut |
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Institution: | (1) Pulkovo Astronomical Observatory, RAS, St. Petersburg, 196140, Russia;(2) Kislovodsk Solar Station of the Pulkovo Astronomical Observatory, Kislovodsk, Gagarina st.100, Box 145, 357700, Russia;(3) Physics Department, University of Antwerp, B-2610 Antwerp, Belgium |
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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. |
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