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Temperature of Polar Corona of the Sun According to Kislovodsk Observations During 1957–2002

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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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Authors and Affiliations

  1. Pulkovo Astronomical Observatory, RAS, St. Petersburg, 196140, Russia

    V. I. Makarov

  2. Kislovodsk Solar Station of the Pulkovo Astronomical Observatory, Kislovodsk, Gagarina st.100, Box 145, 357700, Russia

    A. G. Tlatov

  3. Physics Department, University of Antwerp, B-2610, Antwerp, Belgium

    D. K. Callebaut

Authors
  1. V. I. Makarov
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  2. A. G. Tlatov
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  3. D. K. Callebaut
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Correspondence to V. I. Makarov.

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Makarov, V.I., Tlatov, A.G. & Callebaut, D.K. Temperature of Polar Corona of the Sun According to Kislovodsk Observations During 1957–2002. Sol Phys 237, 201–210 (2006). https://doi.org/10.1007/s11207-006-1680-2

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  • DOI: https://doi.org/10.1007/s11207-006-1680-2

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