Scientific achievements. Solar system
2024
Detection of Depression Effects in Radio Emission from the Solar Corona
Absorption in many fine structures in coronal plasma has been detected using radio observations. The data were obtained at RATAN-600 with a new spectral complex with a relative frequency resolution of 10−5 and a time resolution of 8 ms in the range of 1–3 GHz in the radio emission spectra of individual active regions (ARs), prominences, and filaments. Similar structures in the form of “coronal rain” are studied in optics in the X-ray and EUV lines at large telescopes with diameters of 1.6 m and 4.0 m; but for the first time, they were discovered in the spectra of the corona at radio waves. The spectra of the quiet Sun and active regions of NOAA 13507(8) were obtained. New spectral capabilities of the instrument for studying the fine structure of the corona can be used to solve the problem of heating the solar corona and to measure its temperature balance.
Authors:
Bogod V.M., Lebedev M.K., Ovchinnikova N.E., Ripak A.M., Storozhenko A.A., Kurochkin E.A. (SAO RAS)
Published:
1. Bogod V.M., Lebedev M.K., Ovchinnikova N.E. et al. On a new concept of spectral radiometry at RATAN-600 // Izvestiya Krymskoy Astrophysical Obs. 2023. Vol. 119. No. 4. P. 17–26.
2. Ovchinnikova N., Bogod V., Lebedev M., Observation at radio frequencies of the hydroxyl (OH) absorption line in filaments and prominences above active regions of the Sun, Solar-Terrestrial Physics, vol. 10, issue 3, pp. 18-24, DOI:10.12737/stp-103202403
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