Abstract
A major eruptive flare occurred on 12 January 2022 in the northeast not far behind the solar limb (N32 E116). The eruption produced a fast coronal mass ejection (CME). The rising ejecta was observed by the telescopes in the extreme ultraviolet and by the multi-frequency Siberian Radioheliograph (SRH) in the 5.8 – 11.8 GHz range. We show how the slope of the decrease in the brightness temperature of the rising ejecta, measured from the microwave SRH images, is related to the heat inflow or outflow in its body during rapid expansion with high acceleration and under the assumption that the plasma ionization state changes insignificantly within the measurement interval. We found that the low-temperature plasma component in the erupting prominence underwent heating. Most likely, this was due to the predominance of ohmic heating because i) the polytropic index of expanding plasma expected in this case was closest to the experimentally measured one, and ii) the ohmic dissipation due to electron-proton collisions loses its efficiency during expansion much slower than the other mechanisms of heating or cooling.
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Data Availability
The datasets analyzed during the current study were derived from the following public domain resources:
Virtual Solar Observatory sdac.virtualsolar.org/
CDAW Data Center cdaw.gsfc.nasa.gov/
SOHO LASCO CME Catalog cdaw.gsfc.nasa.gov/CME_list/
Raw and preliminary SRH data computed automatically in real time are accessible via ftp://ftp.rao.istp.ac.ru/SRH/. The test-mode SRH data used in this study are available from the corresponding author on reasonable request.
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Acknowledgments
We are grateful to our colleagues from the Radio Astrophysical Department and the Radio Astrophysical Observatory in Badary. We thank A.A. Kochanov for discussions and assistance. We thank the anonymous reviewer for valuable comments that helped improve the original manuscript. The SRH data were obtained using the Unique Research Facility Siberian Solar Radio Telescope (ckp-rf.ru/catalog/usu/73606/).
We are grateful to the NASA/SDO and the AIA science teams; the NASA’s STEREO/SECCHI science and instrument teams; and the team operating LASCO on SOHO. SOHO is a project of international cooperation between ESA and NASA. We appreciate the team maintaining the CME Catalog at the CDAW Data Center by NASA and the Catholic University of America in cooperation with the Naval Research Laboratory.
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This study was financially supported by the Ministry of Science and Higher Education of the Russian Federation.
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A.M. Uralov proposed the basic method, interpreted the results, and wrote Sections 1, 3, and 4. S.V. Lesovoi and M.V. Globa acquired, calibrated, and preliminarily analyzed the SRH data that were used in this study. V.V. Grechnev made measurements, prepared figures, and wrote Sections 2 and 5. All authors discussed intermediate results and further actions at all stages of the study and reviewed the manuscript.
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Uralov, A.M., Grechnev, V.V., Lesovoi, S.V. et al. Plasma Heating in an Erupting Prominence Detected from Microwave Observations with the Siberian Radioheliograph. Sol Phys 298, 117 (2023). https://doi.org/10.1007/s11207-023-02210-w
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DOI: https://doi.org/10.1007/s11207-023-02210-w