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Sub-THz emission from stellar flares and energy release diagnostics

Published online by Cambridge University Press:  23 December 2024

Yuriy T. Tsap Open the ORCID record for Yuriy T. Tsap [Opens in a new window] ,
Alexander V. Stepanov  and
Victor F. Melnikov
Yuriy T. Tsap*
Affiliation:
Crimen Astrophysical Observatory, Nauchny, 298409
Alexander V. Stepanov
Affiliation:
Central Astronomical Observatory at Pulkovo, St. Petersburg, 196140, Russia
Victor F. Melnikov
Affiliation:
Central Astronomical Observatory at Pulkovo, St. Petersburg, 196140, Russia
*
email: [email protected]
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Abstract

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A comparative analysis of sub-THz emission of stellar flares from red dwarfs has been carried out. ALMA observations indicate that the sub-THz emission flux from stellar flares with a duration of 10 s is an order of magnitude greater than for solar flares. The sub-THz emission is linearly polarized and decreases with frequency. The degree of polarization can reach tens of percent. We show that these types of spectrum slopes and linear polarization can be caused by the synchrotron emission of ultrarelativistic electrons. The origin of the observed relationships between sub-THz, low frequency radio, and X-ray emissions of stellar flares are discussed.

Keywords

stellar flaressub-THz emissionenergy release mechanism
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S365: Dynamics of Solar and Stellar Convection Zones and Atmospheres , December 2023 , pp. 409 - 413
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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