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Analysis of Study Results of the Polar Coronal Hole on the Sun According to Observations in the Microwave Wavelength Range

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Abstract

An overview is presented of the main results of the study of the polar coronal hole over the North pole of the Sun based on observations of the solar eclipse on March 29, 2006, using the RATAN-600 radio telescope in a wide cm-range of wavelengths (1.03, 1.38, 2.7, 6.2, 13.0, 30.7 cm) along with observational and theoretical data about the properties of Solar coronal holes published by various authors. The results obtained are discussed: the distribution of brightness temperatures of polar coronal holes over the North pole of the Sun at distances of 1.005–2.0 in units of the Sun optical disk radius from the center of the solar disk; the increase in microwave radiation of polar coronal holes recorded at short wavelengths; the identity of the temperature properties of the polar coronal holes and low-latitude coronal holes on the Sun during the period of minimum solar activity. Comparison of the obtained brightness temperatures of the polar coronal hole with the brightness temperatures of large low-latitude coronal holes at similar wavelengths observed earlier (1973–1976, 1984–1987 yr) were done. This comparison has indicated an identity of the temperature properties of coronal holes regardless of their location on the Sun and the organization of coronal holes during the period of minimum solar activity.

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ACKNOWLEDGMENTS

I thank the group of RATAN-600 radio engineers which has enabled successful observation of solar eclipse on March 29, 2006, on precision radio equipment: N.A. Nizhel’skij, G.N. Zhekanis, P.G. Tsybulev, N.N. Bursov, and S.Kh. Tokhchukova for the help in primary processing of the received data, and also Topchilo N.A. for help in the design of figures.

Funding

The work was performed within the SAO RAS state assignment in the part “Conducting Fundamental Science Research”.

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  1. St. Petersburg Branch of Special Astrophysical Observatory, St. Petersburg, Russia

    O. A. Golubchina

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Correspondence to O. A. Golubchina.

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Golubchina, O.A. Analysis of Study Results of the Polar Coronal Hole on the Sun According to Observations in the Microwave Wavelength Range. Astron. Rep. 65, 322–330 (2021). https://doi.org/10.1134/S1063772921050036

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  • DOI: https://doi.org/10.1134/S1063772921050036

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