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Analysis of the Physical Characteristics of the Polar Coronal Hole on the Sun in the Microwave Wavelength Range

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Abstract

The results of a study of a polar coronal hole based on data from observations of the solar eclipse of March 29, 2006, with the RATAN-600 radio telescope in a wide centimeter wavelength range of λ = (1.03, 1.38, 2.7, 6.2, 13.0, 30.7) cm are analyzed. The circumstances of the eclipse and the method used to process the observational data are briefly described. The distributions of the brightness temperatures in a polar coronal hole of the Sun from the limb of the solar optical disk to distances equal to its two radii are discussed. A sharp decrease in the intensity of radio emission of the polar coronal hole at wavelengths λ ≥ 6 cm near the solar limb was detected. The absence of the detection of a polar coronal hole at λ = (1.03, 1.38, 2.7) cm wavelengths is studied based on data from earlier observations by the BPR and RATAN-600 radio telescopes of the quiet Sun. The similarity of the temperature properties of polar and low-latitude coronal holes discovered in the radio range is discussed. The discussion provides an overview of some results of the study of a solar polar coronal hole based on observations with the radio telescopes BPR, RATAN-600, and RT-22 (Crimean Astrophysics Observatory), the Nobeyama radioheliograph, and other radio telescopes based on (EUV SOHO/EIT) data and data from theoretical works.

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ACKNOWLEDGMENTS

The author thanks the RATAN-600 group of radio engineers who ensured successful observations on precision radio equipment: N.A. Nizhelsky, G.N. Zhekanisu, P.G. Tsybulev, and N.N. Bursov.

Funding

The work was carried out within the framework of the state assignment of the Special Astrophysical Observatory of the Russian Academy of Sciences in the section “Conducting Basic Scientific Research.”

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  1. Special Astrophysical Observatory, St. Petersburg branch, Russian Academy of Sciences, St. Petersburg, Russia

    O. A. Golubchina

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Golubchina, O.A. Analysis of the Physical Characteristics of the Polar Coronal Hole on the Sun in the Microwave Wavelength Range. Geomagn. Aeron. 61 (Suppl 1), S9–S15 (2021). https://doi.org/10.1134/S0016793222010091

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  • DOI: https://doi.org/10.1134/S0016793222010091

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