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Modeling of the solar flare chromosphere and sub-THz radiation with FLARIX and RADYN

Published online by Cambridge University Press:  23 December 2024

Galina G. Motorina Open the ORCID record for Galina G. Motorina [Opens in a new window] ,
Yuriy T. Tsap Open the ORCID record for Yuriy T. Tsap [Opens in a new window] ,
Jana Kašparová ,
Victoria V. Smirnova Open the ORCID record for Victoria V. Smirnova [Opens in a new window] ,
Alexander S. Morgachev  and
Miroslav Bárta
Galina G. Motorina*
Affiliation:
Central Astronomical Observatory at Pulkovo of Russian Academy of Sciences, St. Petersburg, 196140, Russia Space Research Institute of Russian Academy of Sciences, Moscow, 117997, Russia Astronomical Institute of the Czech Academy of Sciences, 251 65 Ondřejov, Czech Republic,
Yuriy T. Tsap
Affiliation:
Crimen Astrophysical Observatory, Nauchny, 298409
Jana Kašparová
Affiliation:
Astronomical Institute of the Czech Academy of Sciences, 251 65 Ondřejov, Czech Republic,
Victoria V. Smirnova
Affiliation:
Crimen Astrophysical Observatory, Nauchny, 298409
Alexander S. Morgachev
Affiliation:
Central Astronomical Observatory at Pulkovo of Russian Academy of Sciences, St. Petersburg, 196140, Russia
Miroslav Bárta
Affiliation:
Astronomical Institute of the Czech Academy of Sciences, 251 65 Ondřejov, Czech Republic,
*
email: galina.motorina@asu.cas.cz
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Abstract

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The origin of the sub-terahertz (sub-THz) component of radio emission from solar flares, which is characterized by the increase flux with frequency in the 100-400 GHz range, is considered. On the basis of equations of 1D non-LTE radiation hydrodynamics we simulated the altitude distribution of the plasma density and temperature inside the flare loop caused by the interaction of non-stationary beam of accelerated electrons in the form of a triangular pulse with the chromospheric plasma. The FLARIX numerical code was used to calculate the dynamics of the flare plasma parameters at different heights which are compared with the RADYN numerical code. We found that the characteristic heights of the formation of sub-THz emission vary over a wide range with time for both codes. The main contribution to the sub-THz emission comes from the chromospheric and transition region plasma with temperatures of 104–105K.

Keywords

Sun: Flares - Sun: X-raysEUVRadio emissionsub-THz emission
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. 420 - 425
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

Footnotes

†

Most of the presented contribution was finished before February 2022

References

Carlsson, M., Fletcher, L., Allred, J., et al. 2023, The F-CHROMA grid of 1D RADYN flare models. Astron. Astrophys., 673, A150.CrossRefGoogle Scholar
Carlsson, M. & Stein, R. F. 1992, Non-LTE Radiating Acoustic Shocks and CA II K2V Bright Points. ApJL, 397, L59.CrossRefGoogle Scholar
Carlsson, M. & Stein, R. F. 1997, Formation of Solar Calcium H and K Bright Grains. ApJ, 481(1), 500–514.CrossRefGoogle Scholar
Dulk, G. A. 1985, Radio emission from the sun and stars. Annual Rev. Astron. Astrophys., 23, 169–224.CrossRefGoogle Scholar
Fleishman, G. D. & Kontar, E. P. 2010, Sub-Thz Radiation Mechanisms in Solar Flares. ApJL, 709(2), L127–L132.CrossRefGoogle Scholar
Kaufmann, P., Raulin, J. P., Correia, E., et al. 2001, Rapid Submillimeter Brightenings Associated with a Large Solar Flare. ApJ, 548(1), L95–L98.CrossRefGoogle Scholar
Kaufmann, P., White, S. M., Marcon, R., et al. 2015, Bright 30 THz impulsive solar bursts. Journal of Geophysical Research (Space Physics), 120(6), 4155–4163.CrossRefGoogle Scholar
Kašparová, J., Carlsson, M., Heinzel, P., & Varady, M. Modelling of Flare Processes: A Comparison of the Two RHD Codes FLARIX and RADYN. In Werner, K., Stehle, C., Rauch, T. , & Lanz, T., editors, Radiative Signatures from the Cosmos 2019, volume 519 of Astronomical Society of the Pacific Conference Series, 141.Google Scholar
Kerr, G. S. 2023, Interrogating Solar Flare Loop Models with IRIS Observations 2: Plasma Properties, Energy Transport, and Future Directions. Frontiers in Astronomy and Space Sciences, 9, 425.CrossRefGoogle Scholar
Kontar, E. P., Motorina, G. G., Jeffrey, N. L. S., et al. 2018, Frequency rising sub-THz emission from solar flare ribbons. Astronomy & Astrophysics, 620, A95.CrossRefGoogle Scholar
Krucker, S., Giménez de Castro, C. G., Hudson, H. S., et al. 2013, Solar flares at submillimeter wavelengths. Astronomy and Astrophysics Review, 21, 58.CrossRefGoogle Scholar
Lüthi, T., Lüdi, A., & Magun, A. 2004, Determination of the location and effective angular size of solar flares with a 210 GHz multibeam radiometer. Astronomy & Astrophysics, 420, 361–370.CrossRefGoogle Scholar
MacGregor, M. A., Weinberger, A. J., Loyd, R. O. P., et al. 2021, Discovery of an Extremely Short Duration Flare from Proxima Centauri Using Millimeter through Far-ultraviolet Observations. ApJL, 911(2), L25.CrossRefGoogle Scholar
Morgachev, A. S., Tsap, Y. T., Smirnova, V. V., et al. 2020, Numerical Simulation of Sub-Terahertz Thermal Emission: RADYN Code. Geomagnetism and Aeronomy, 60(8), 1038–1049.CrossRefGoogle Scholar
Raulin, J. P., Makhmutov, V. S., Kaufmann, P., et al. 2004, Analysis of the impulsive phase of a solar flare at submillimeter wavelengths. SoPh, 223(1-2), 181–199.Google Scholar
Trottet, G., Raulin, J. P., Kaufmann, P., et al. 2002, First detection of the impulsive and extended phases of a solar radio burst above 200 GHz. Astronomy & Astrophysics, 381, 694–702.CrossRefGoogle Scholar
Tsap, Y. T., Smirnova, V. V., Morgachev, A. S., et al. 2016, On the origin of 140 GHz emission from the 4 July 2012 solar flare. Advances in Space Research, 57(7), 1449–1455.CrossRefGoogle Scholar
Varady, M., Kasparova, J., Moravec, Z., et al. 2010, Modeling of Solar Flare Plasma and Its Radiation. IEEE Transactions on Plasma Science, 38(9), 2249–2253.CrossRefGoogle Scholar
Vernazza, J. E., Avrett, E. H., & Loeser, R. 1981, Structure of the solar chromosphere. III. Models of the EUV brightness components of the quiet sun. Astrophysical Journal, Suppl. Ser., 45, 635–725.CrossRefGoogle Scholar