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1.3.7.4. Sun and near-Earth space, solar-terrestrial connections
1.3.7.6. Development of methods of ground-based and extra-atmospheric astronomy
Section 3. Sun; Section 11. Radio telescopes and methods
Detection of the hydroxyl (OH) absorption line in the radio emission of the solar corona
When observing the Sun with the RATAN-600 using a new high-speed spectral polarimetric complex with a frequency resolution of 0.12–8 MHz and a time resolution of 8 ms in the range of 1–3 GHz in the radio emission spectra of individual active regions (AR), an absorption line was discovered on the Sun in the frequency range of 1.5–1.65 GHz near the hydroxyl absorption line (1.7 GHz). The absorption was observed only in the emission of those ARs that were overlapped with a cool filament visible in the H-α images or on the limb in the presence of a prominence, where the existence of a hydroxyl molecule is potentially possible. The line shape corresponds to the estimated model calculations for conditions in a cool filament in the solar corona (7500 K, ~10-6 atm) taking into account the instrumental function of the 1–3 GHz spectral polarimetric complex (without taking into account the displacement due to a magnetic field). The discovery of molecular lines in the solar corona may indicate the nature of its heating and the stability of its temperature balance.
Authors:
Ovchinnikova N.E., Bogod V.M., Lebedev M.K. Ripak A.M., Storozhenko A.A., Kurochkin E.A. (SAO RAS)
Published:
1. Bogod V. M., Lebedev M. K., Ovchinnikova N. E., Ripak A. M., Storozhenko A. A., Spectroradiometry of the Solar Corona on the RATAN-600, Cosmic Research, 2023, Vol. 61, No. 1, pp. 27–33, DOI: 10.1134/S001095252301001X
2. Ovchinnikova N.E., Lebedev M.K., Bogod V.M., Ripak A.M., A.A. Storozhenko, Results of a new approach to the analysis of multi-wavelength observations data obtained with RATAN-600 The Multifaceted Universe: Theory and Observations – 2022, 23-27 May 2022, SAO RAS, Nizhny Arkhyz, Russia; published December 14, 2022. Online at https://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=425, id.7
3. Bogod V., Lebedev M., Ovchinnikova N., Ripak A., Kurochkin E., Detection of absorption in the decimeter radio emission of solar corona, The Multifaceted Universe: Theory and Observations – 2022, 23-27 May 2022, SAO RAS, Nizhny Arkhyz, Russia; published December 14, 2022. Online at https://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=425, id.5
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