Abstract
We examined records of the radiation of three flare processes obtained in the Nobeyama observatory in 1992, 2001, and 2003. Observations with the Nobeyama radio heliograph at the frequencies 17 and 34GHz were performed with a sufficient spatial resolution to determine the physical nature of the radiation source. In the first two cases, the radiation source appeared to be a coronal magnetic loop; in the third case, a group of sunspots. In the spectra of the first two events a characteristic modulation was detected, with the frequency that increased by a factor of 2–3 for a fairly short period immediately before the beginning of the flare and later decreased gradually to the initial value. In the spectrum of the event on June 17, 2003 (the radiation source were the sunspots), no modulation of such a type was seen.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Nakajima, H., Nishio, M., Enome, S., Shibasaki, K., Takano, T., Hanaoka, Y., Torii, C., Sekiguchi, H., Bushimata, T., Kawashima, S., Shinohara, N., Irimajiri, Y., Koshiishi, H., Kosugi, T., Shiomi, Y., Sawa, M., and Kai, K.: 1994, Proc. IEEE 82, 705.
Shibasaki et al. “Solar Radio Data Acquisition and Communication System (SORDACS) of Toyokawa Observatory”, Proc. of the Res. Inst. of Atmospherics, Nagoya Univ., 26, 117 (1979).
Shkelev E.I., Kislyakov A.G., Lupov S.Yu., Radiophys.& Quant.Electronics, 45, 433, 2002.
Altyntsev A.T., Grechnev V.V., Meshalkina N.S., Yan Y.. Microwave Type III-Like Bursts as Possible Signatures of Magnetic Reconnection. Solar Physics (2007) 242: 111–123
Altyntsev A.T., Grechnev V.V., Nakajima H., Fujiki K., Nishio M., and Prosovetsky D.V. The limb flare of November 2, 1992: Physical conditions and scenario. Astron. Astrophys. Suppl. Ser. 135, 415–427 (1999).
Kundu M.R., Grechnev V.V., White S.M., Schmahl E.J., Meshalkina N.S., Kashapova L.K.. High-Energy Emission from a Solar Flare in Hard X-rays and Microwaves. Solar Physics, Volume 260, Issue 1, pp.135–156 (2009).
Dulk G.A., Ann.Rev. Astron.Astrophys. J., 23, 169, (1985).
V. V. Zaitsev and A. V. Stepanov, Issled. Geomagn. Aeron. Fiz. Solntsa, 37, 3 (1975).
Nakariakov V.M., Melnikov V.F., Reznikova V.E., A&A, 412, L7 (2003).
Khodachenko M.L., Kislyakova K.G., Zagarashvili T.V., Kislyakov A.G., Panchenko M., Zaitsev V.V. and Rucker H.O. Detection of large-scale kink oscillations of coronal loops manifested in modulations of solar microwave emission. A&A 525, A105 (2011).
Nakariakov V.M, Melnikov V.F. Modulation of gyrosynchrotron emission in solar and stellar flares by slow magnetoacoustic oscillations. A&A 446, 1151–1156 (2006).
Zaitsev V.V., Stepanov A.V., Urpo S. and Pohjolainen S. LRC-circuit analog of current-carrying magnetic loop: diagnostics of electrical parameters. Astron. Astrophys. 337, 887–896 (1998).
L.D. Landau, E.M. Lifshiz, Electrodynamics of Continuous Media (Oxford: Pergamon Press, 1984).
M. L. Khodachenko, V. V. Zaitsev, A. G. Kislyakov, and A.V. Stepanov, Space Sci. Rev, 149, 83 (2010).
Vernazza J.E., Avrett E.H., Loeser R., Ap. J. Suppl. Ser., 45, 635 (1981).
Brown J.C., Solar Phys., 29, 421 (1973).
Zaitsev V.V., Shibasaki K., Astron.Rep., 49, 1009 (2005).
V.V. Zaitsev, K.G. Kislyakova, A.T. Altyntsev, N.S. Meshalkina. Unusual Preflare Modulation of Microwave Radiation in Coronal Magnetic Loops. Radiophysics and Quantum Electronics, Vol. 54, No. 4, September, 2011, pp.219–234.
Acknowledgements
This work was partially supported by the Russian Foundation for Basic Research (project Nos. 10–02–00265-a, 08–02–00119-a, and 09–02–00226-a), as well as by the contract KD NK-21P with the Federal Agency of Education of the Russian Federation and the project No. 228319 of the European Union within the framework of the project “EuroPlanet”-RI FP7.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2012 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Zaitsev, V.V., Kislyakova, K.G., Altyntsev, A.T., Meshalkina, N.S. (2012). Dynamics of the Electrical Currents in Coronal Magnetic Loops. In: Obridko, V., Georgieva, K., Nagovitsyn, Y. (eds) The Sun: New Challenges. Astrophysics and Space Science Proceedings, vol 30. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29417-4_5
Download citation
DOI: https://doi.org/10.1007/978-3-642-29417-4_5
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-29416-7
Online ISBN: 978-3-642-29417-4
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)