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Effective Gyroresonance Layers in the Transition Region of the Active Region of the Solar Atmosphere. Magnetic Fields and Heights

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Abstract—We present a method of determination of numbers of gyroresonance layers most effectively radiating in the transition region of the active solar atmosphere. It is based on determination of frequency in the spectrum of an extraordinary wave of an active region, at which the gradient of this spectrum abruptly rises. Observations of 29 active regions carried out at the RATAN-600 radio telescope have been analyzed. The magnetic field in the transition region was determined from the frequency of bending point in the spectrum of antenna temperatures in an extraordinary mode under condition of emission in the third harmonic of the gyrofrequency. The relation between the photospheric magnetic field strength and the magnetic field strength in the transition region (1.52–2.28) is substantially greater than previously obtained, namely, the field isdecreasedonlyby10–20% in the transition region. The heights in the transition region were determined from the reconstructed magnetic field in the nonlinear force-free approximation, and are in the range of 1.00–3.57 Mm.

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ACKNOWLEDGMENTS

The authors are grateful to the reviewer for comments that improved the paper.

Funding

This paper was supported by the Russian Foundation for Basic Research (grants no. 8-2921016-mk and no. 18-02-00045), and also performed as part of state assignment No. АААА-А17117011810013-4, within the program of the Presidium of the Russian Academy of Sciences no. 28 “Space: research of fundamental processes and their interaction”, project 1D.

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Authors and Affiliations

  1. St. Petersburg State University, 199034, St. Petersburg, Russia

    L. V. Yasnov & A G. Stupishin

  2. St. Petersburg Branch, Special Astrophysical Observatory of RAS, 196140, St. Petersburg, Russia

    V. M. Bogod

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  1. L. V. Yasnov
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  2. V. M. Bogod
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  3. A G. Stupishin
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Correspondence to L. V. Yasnov, V. M. Bogod or A G. Stupishin.

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Translated by N. Oborina

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Yasnov, L.V., Bogod, V.M. & Stupishin, A.G. Effective Gyroresonance Layers in the Transition Region of the Active Region of the Solar Atmosphere. Magnetic Fields and Heights. Astrophys. Bull. 75, 50–58 (2020). https://doi.org/10.1134/S1990341320010071

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