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Sign reversals of the polarization of the microwave emission of sunspot radio sources

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Abstract

Thermal cyclotron emission features from a sunspot-associated source in a solar active region are considered in the framework of a three-level temperature model with a hot layer. The images of the source have a complex fine structure, with rings with different brightness temperatures and different signs of circular polarization. The proposed model suggests the possibility of a double or multiple reversal of the sign of polarization, as well as a significant increase of the fluxes in the 3–4 cm range, as is typical of active regions associated with proton flares. Energetic particles of the halo cannot provide the required temperatures of the layers. Alternative heating mechanisms are discussed.

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References

  1. G. B. Gelfreikh, in Three-Dimensional Structure of Solar Active Regions, Ed. by C. Alissandrakis and B. Schmieder (Astron. Soc. Pac., San Francisco, 1998); Astron. Soc. Pac. Conf. Ser. 155, 110 (1998).

    Google Scholar 

  2. T. I. Kaltman, A. N. Korzhavin, N. G. Peterova, et al., in Three-Dimensional Structure of Solar Active Regions, Ed. by C. Alissandrakis and B. Schmieder (Astron. Soc. Pac., San Francisco, 1998); Astron. Soc. Pac. Conf. Ser. 155, 140 (1998).

    Google Scholar 

  3. S. M. White and M. R. Kundu, Sol. Phys. 174, 31 (1997).

    Article  ADS  Google Scholar 

  4. C. E. Alissandrakis and M. R. Kundu, Astrophys. J. Lett. 253, L49 (1982).

    Article  ADS  Google Scholar 

  5. K. R. Lang and R. F. Willson, Astrophys. J. Lett. 255, L111 (1982).

    Article  ADS  Google Scholar 

  6. N. Gopalswamy, J. P. Raulin, M. R. Kundu, et al., Astron. Astrophys. 316, L25 (1996).

    ADS  Google Scholar 

  7. V. V. Zheleznyakov, Radio Radiation of the Sun and Planets (Nauka, Moscow, 1964) [in Russian].

    Google Scholar 

  8. E. Ya. Zlotin, Astron. Zh. 45(3), 585 (1968) [Sov. Astron. 12 (3), 464 (1968)].

    ADS  Google Scholar 

  9. G. B. Gel’freikh, Izv. Ross. Akad. Nauk, Ser. Fiz. 59, 90 (1995).

    Google Scholar 

  10. Sh. B. Akhmedov, V. M. Bogod, V. N. Borovik, et al., Issled. Geomagn. Aeron. Fiz. Solntsa 62, 172 (1982).

    Google Scholar 

  11. Sh. B. Akhmedov, V. M. Bogod, V. N. Borovik, et al., Izv. Spets. Astrofiz. Obs., Astrofiz. Issled. 25, 105 (1987).

    ADS  Google Scholar 

  12. V. M. Bogod and S. Kh. Tokhchukova, Pis’ma Astron. Zh. 29, 305 (2003) [Astron. Lett. 29, 263 (2003)].

    Google Scholar 

  13. N. G. Peterova, A. A. Golovko, and M. N. Stoyanova, Astron. Zh. 74, 466 (1997) [Astron. Rep. 41, 409 (1997)].

    ADS  Google Scholar 

  14. N. G. Peterova and A. N. Korzhavin, Bull. Spec. Astrophys. Obs. 44, 71 (1998).

    ADS  Google Scholar 

  15. G. B. Gel’freikh, A. N. Korzhavin, and G. F. Shemyakin, Radio Astronomical Observations of the Solar Eclipse of May 20, 1996, Ed. by G. B. Gel’freikh and N. G. Peterova (Nauka, Moscow, 1972), p. 50 [in Russian].

    Google Scholar 

  16. Ya. Zlotnik, Radiophys. Quantum Electron. 44, 53 (2001).

    Article  Google Scholar 

  17. A. V. Stepanov and Y. T. Tsap, Sol. Phys. 211, 135 (2002).

    Article  ADS  Google Scholar 

  18. D. Tsiklauri and V. M. Nakariakov, Astron. Astrophys. 379, 1106 (2001).

    ADS  Google Scholar 

  19. E. Ya. Zlotnik and O. A. Sheiner, in Current Problems of Solar and Stellar Activity, Ed. by V. V. Zaitsev (IPF RAN, Nizhni Novgorod, 2003), Vol. II, p. 308 [in Russian].

    Google Scholar 

  20. T. I. Kal’tman and A. N. Korzhavin, in Current Problems of Solar and Stellar Activity, Ed. by V. V. Zaitsev and L. V. Yasnov (NIIRF SPbGU, St. Petersburg, 2002), p. 51 [in Russian].

    Google Scholar 

  21. G. B. Gel’freikh and A. N. Korzhavin, Physics of Sunspots, Ed. by V. E. Stepanov (Nauka, Moscow, 1976), p. 94 [in Russian].

    Google Scholar 

  22. C. E. Alissandrakis, M. R. Kundu, and P. Lantos, Astron. Astrophys. 82, 30 (1980).

    ADS  Google Scholar 

  23. R. Thomas, R. Starr, and C. J. Crannell, Sol. Phys. 95, 323 (1985).

    Article  ADS  Google Scholar 

  24. J. A. Miller, P. J. Cargill, A. G. Emsile, et al., J. Geophys. Res. 102, 14631 (1997).

    Google Scholar 

  25. B. V. Somov and S. I. Syrovskii, Usp. Fiz. Nauk 120, 217 (1976) [Sov. Phys. Usp. 19, 813 (1976)].

    Google Scholar 

  26. T. P. Borisevich, G. N. Il’in, A. N. Korzhavin, et al., Kosm. Issled. 42, 1 (2004) [Cosmic Res. 42, 561 (2004)].

    Google Scholar 

  27. G. B. Gel’freikh, Yu. T. Tsap, Yu. G. Kopylova, et al., Pis’ma Astron. Zh. 30, 540 (2004) [Astron. Lett. 30, 489 (2004)].

    Google Scholar 

  28. M. J. Aschwanden, in SOLMAG 2002, Ed. by H. Sawaya-Lacoste (Noordwijk, Netherlands, 2002), ESA SP-505, p. 191.

  29. M. J. Aschwanden, Astrophys. J. Lett. 559, L171 (2001).

    Article  ADS  Google Scholar 

  30. S. Urpo, N. M. Bakhareva, V. V. Zaitsev, and A. V. Stepanov, Sol. Phys. 154, 317 (1994).

    Article  ADS  Google Scholar 

  31. A. Czaykowska, D. Alexander, and B. De Pontieu, Astrophys. J. 552, 849 (2001).

    Article  ADS  Google Scholar 

  32. Yu. T. Tsap, Yu. G. Kopylova, and N. S. Nesterov, Kin. Fiz. Neb. Tel 18, 3 (2002).

    ADS  Google Scholar 

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Authors and Affiliations

  1. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachaevo-Cherkesskaya Republic, 357169, Russia

    T. I. Kal’tman & A. N. Korzhavin

  2. Crimean Astrophysical Observatory, National Academy of Sciences of Ukraine, Nauchnyi, Crimea, 98409, Ukraine

    Yu. T. Tsap

Authors
  1. T. I. Kal’tman
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  2. A. N. Korzhavin
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  3. Yu. T. Tsap
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__________

Translated from Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 82, No. 9, 2005, pp. 838–846.

Original Russian Text Copyright © 2005 by Kal’tman, Korzhavin, Tsap.

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Kal’tman, T.I., Korzhavin, A.N. & Tsap, Y.T. Sign reversals of the polarization of the microwave emission of sunspot radio sources. Astron. Rep. 49, 747–754 (2005). https://doi.org/10.1134/1.2045325

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