aat Acta Astrophys. Tau. Acta Astrophysica Taurica 2712-925X Kiselev Nikolai Nikolaevich, Mosсow, settlement Moskovskii, Tat'yanin Park Str., 12, Moscow, Russia. RU 109 Modern Instruments and Methods in Astronomy Conference Proceedings On the concept of spectral radiometry on RATAN-600 Bogod Vladimir Lebedev Mikhail Ovchinnikova Nina Ripak Anatolii Storozhenko Anton Kurochkin Evgenii Special Astrophysical Observatory, Nizhnij Arkhyz 369167, Zelenchukskiy region, Karachai-Cherkessian Republic, Russia Special Astrophysical Observatory, Nizhnij Arkhyz 369167, Zelenchukskiy region, Karachai-Cherkessian Republic, Russia Special Astrophysical Observatory, Nizhnij Arkhyz 369167, Zelenchukskiy region, Karachai-Cherkessian Republic, Russia Special Astrophysical Observatory, Nizhnij Arkhyz 369167, Zelenchukskiy region, Karachai-Cherkessian Republic, Russia Special Astrophysical Observatory, Nizhnij Arkhyz 369167, Zelenchukskiy region, Karachai-Cherkessian Republic, Russia Special Astrophysical Observatory, Nizhnij Arkhyz 369167, Zelenchukskiy region, Karachai-Cherkessian Republic, Russia 28 06 2025 6 2 7 13 23 06 2025 Copyright (c) 2026 Bogod V., Lebedev M., Ovchinnikova N., Ripak A., Storozhenko A., Kurochkin E. 2026 Vladimir Bogod, Mikhail Lebedev, Nina Ovchinnikova, Anatolii Ripak, Anton Storozhenko, Evgenii Kurochkin The metadata for this submission is licensed under a Creative Commons Attribution 4.0 International License. Copyright and publishing rights for texts published in Acta Astrophysica Taurica is retained by the authors, with first publication rights granted to the journal.Texts are free to use with proper attribution and link to the licensing (Creative Commons Attribution 4.0 International).

We present the results of new observations of radio emission from the solar corona in the range 1–3 GHz using RATAN- 600. The difficulties of observations in this range are caused by a large amount of industrial interference (mobile communications, satellite navigation, microwave ovens, aircraft radars, etc.). Problems related to the conversion of magnetic energy into the energy of flares, heating of the corona, the role of narrow-band phenomena, and quasiperiodic pulsations in the solar corona still remain relevant. A change in the concept of the receiving spectral equipment for the RATAN-600 radio telescope has become urgent. SAO RAS is currently working on the creation of a series of nextgeneration spectral complexes to cover the entire operating range of RATAN-600. In this paper, we present the results of the first series of observations made with the panoramic spectral radiometric complex in the range of 1–3 GHz for studying low-contrast coronal structures. It has become feasible to implement observation modes for various objects: from powerful flaring radio sources to faint structures down to the radio granulation level. High-speed instruments for radio signal reception and information processing have been developed and introduced in order to separate useful signals from interference in real-time mode. These parameters, combined with a large effective area and wide frequency coverage of RATAN-600, allowed for observations of weak coronal structures in the frequency range of 1–3 GHz. We  discuss the results of the first series of observations of weak coronal structures and their interpretation in terms of their impact on thermal processes in the corona.

Sun radio telescope observations spectrum principal component analysis Observations at the SAO RAS telescopes are supported by the Ministry of Science and Higher Education of the Russian Federation. The instrumentation upgrade is implemented within the framework of the national project “Science and Universities”. The work was carried out within the state assignment of the SAO RAS, approved by the Ministry of Science and Higher Education of the Russian Federation. Bogod V.M., 2020. In I.I. Romanyuk, I.A. Yakunin, A.F. Valeev, D.O. Kudryavtsev (Eds.), Ground-Based Astronomy in Russia. 21st Century. pp. 399–404. doi:10.26119/978-5-6045062-0-2_2020_399. Bogod V.M., Mercier C., Yasnov L.V., 2001. J. Geophys. Res., vol. 106, no. A11, pp. 25353–25360. Bogod V.M., Lebedev M.K., Ovchinnikova N.E., Ripak A.M., Storozhenko A.A., 2023. Cosmic Research, vol. 61, no. 1, pp. 27–33. Drebushchak T.N., 2013. Introduction to chemometrics: Textbook. Novosibirsk: Novosibirsk State University. Lebedev M., Ripak A., Bogod V., 2020. In I.I. Romanyuk, I.A. Yakunin, A.F. Valeev, D.O. Kudryavtsev (Eds.), Ground-Based Astronomy in Russia. 21st Century. pp. 413–416. doi:10.26119/978-5-6045062-0-2_2020_413. Lebedev M.K., Ovchinnikova N.E., Bogod V.M., Ripak A.M., Storozhenko A.A., 2022. Proc. Science, vol. MUTO2022, p. 006. Lebedev M.K., Ovchinnikova N.E., Storozhenko A.A., 2023. In Modern Instruments and Methods in Astronomy, All-Russian Conference Proceedings. p. 8. Maeda K., Wall M.L., Carr L.D., 2015. New Journal of Physics, vol. 17, no. 4, p. 045014. Ovchinnikova N.E., Lebedev M.K., Bogod V.M., Ripak A.M., Storozhenko A.A., 2022. Proc. Science, vol. MUTO2022, p. 007. Ovchinnikova N.E., Lebedev M.K., 2023. Modern Instruments and Methods in Astronomy, All-Russian Conference Proceedings, p. 8. Parker E.N., 1988. Astrophys. J., vol. 330, p. 474. Ovchinnikova N.E., Bogod V.M., Lebedev M.K., 2023. Proceedings of the XXVII All-Russian Annual Conference on Solar Physics “Solar and Solar-Terrestrial Physics – 2023”, p. 245. Pomerantsev A., 2008. Principal component analysis (PCA). Available at: https://rcs.chemometrics.ru/ru/books/metod-glavnykh-komponent/. Ripak A.M., Bogod V.M., Grenkov S.A., Lebedev M.K., 2023. Astrophys. Bull., vol. 78, no. 4, p. 465. Storozhenko A., Lebedev M., Ovchinnikova N., et al., 2020. In I.I. Romanyuk, I.A. Yakunin, A.F. Valeev, D.O. Kudryavtsev (Eds.), Ground-Based Astronomy in Russia. 21st Century. pp. 407–408. doi:10.26119/978-5-6045062-0-2_2020_407. Vakurin V.S., Storozhenko A.A., Zharov V.I., Grechkin A.A., 2023. In Modern Instruments and Methods in Astronomy, All-Russian Conference Proceedings. p. 5. Wilson T.L., 2013. In T.D. Oswalt, H.E. Bond (Eds.), Planets, Stars and Stellar Systems. Volume 2: Astronomical Techniques, Software and Data. p. 283. doi:10.1007/978-94-007-5618-2_6. Yesepkina N.A., Korol’kov D.V., Pariiskii Y.N., 1973. Radio telescopes and radiometers. M.: Nauka.