On a decrease of high-latitude corona temperature of the Sun in the last 50 years

Details On a decrease of high-latitude corona temperature of the Sun in the last 50 years On a decrease of high-latitude corona temperature of the Sun in the last 50 years

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.477..241m&link_type=abstract

In: Proceedings of the Second Solar Cycle and Space Weather Euroconference, 24 - 29 September 2001, Vico Equense, Italy. Editor:

Computer Science

5

Solar Cycle: Corona, Corona Temperature

Scientific paper

The ground-based observations of the green Fe XIV 5303 Å and red Fe X 6374 Å corona forbidden lines obtained at the Kislovodsk Solar Station since 1952 are used to determine the temperature variations of the solar corona. The observations of the solar corona at the Arosa, Pic du Midi, Kislovodsk, Norikura, Kanzelhöhe, Wendelstein and Lomnický Stit have been used to receive the Kislovodsk series of the green K I5303 and red K I6374 corona intensities for 1947-2000. Comparison of the K I5303 with the Wolf numbers W(t) shows high correlation factor 0.91. The mean monthly corona intensity has been calculated in the sunspot (0° - 45°) and at the high-latitude (45° - 90°) zones. We found a decrease of the K I5303 in 1.5 times at the high-latitudes in this period. It was shown that the ratio K I6374/K I5303 increased more than two times. We have found a decrease of temperature in polar zones of the Sun of order 0.1×106 during the last 50 years. It is supposed that a decrease of polar corona temperature connected with an increase of magnetic flux from high-latitude regions of the Sun during the last 120 years.

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