Abstract
We analyze the 26 November 2005 solar radio event observed interferometrically at frequencies of 244 and 611 MHz by the Giant Metrewave Radio Telescope (GMRT) in Pune, India. These observations are used to make interferometric maps of the event at both frequencies with the time cadence of 1 s from 06:50 to 07:12 UT. These maps reveal several radio sources. The light curves of these sources show that only two sources at 244 MHz and 611 MHz are well correlated in time. The EUV flare is more localized with flare loops located rather away from the radio sources. Using SoHO/MDI observations and potential magnetic field extrapolation we demonstrate that both the correlated sources are located in the fan structure of magnetic field lines starting from a coronal magnetic null point. Wavelet analysis of the light curves of the radio sources detects tadpoles with periods in the range P=10 – 83 s. These wavelet tadpoles indicate the presence of fast magnetoacoustic waves that propagate in the fan structure of the coronal magnetic null point. We estimate the plasma parameters in the studied radio sources and find them consistent with the presented scenario involving the coronal magnetic null point.
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References
Afanasyev, A.N., Uralov, A.M.: 2012, Solar Phys. 280, 561.
Alissandrakis, C.E.: 1981, Astron. Astrophys. 100, 197.
Ananthakrishnan, S., Rao, A.P.: 2002, In: R.K. Manchanda, B.G. Pau (eds.) Multi Color Universe 483, Ebenezer Printing House, Mumbai, 233.
Aschwanden, M.J.: 2002, Space Sci. Rev. 101, 187.
Aschwanden, M.J.: 2005, Physics of the Solar Corona. An Introduction with Problems and Solutions, 2nd edn.
Aurass, H., Rausche, G., Mann, G.: 2007, Astron. Astrophys. 471, L37.
Aurass, H., Mann, G., Zlobec, P., Karlický, M.: 2011, Astrophys. J. 730, 57.
Baum, P.J., Bratenahl, A.: 1980, Solar Phys. 67, 245.
Benz, A.O., Battaglia, M., Vilmer, N.: 2011, Solar Phys. 273, 363.
Benz, A.O., Saint-Hilaire, P., Vilmer, N.: 2002, Astron. Astrophys. 383, 678.
Chen, B., Bastian, T.S., Gary, D.E., Jing, J.: 2011, Astrophys. J. 736, 64.
De Moortel, I.: 2009, Space Sci. Rev. 149, 65.
De Moortel, I., Ireland, J., Walsh, R.W.: 2000, Astron. Astrophys. 355, 23.
Del Zanna, G., Aulanier, G., Klein, K.-L., Török, T.: 2011, Astron. Astrophys. 526, A137.
Delaboudinière, J.-P., Artzner, G.E., Brunaud, J., Gabriel, A.H., Hochedez, J.F., Millier, F., et al.: 1995, Solar Phys. 162, 291.
Démoulin, P., Hénoux, J.C., Priest, E.R., Mandrini, C.H.: 1996, Astron. Astrophys. 308, 643.
Démoulin, P., Bagala, L.G., Mandrini, C.H., Hénoux, J.C., Rovira, M.G.: 1997, Astron. Astrophys. 325, 305.
Domingo, V., Fleck, B., Poland, A.I.: 1995, Solar Phys. 162, 1.
Gary, G.A.: 1989, Astrophys. J. Suppl. Ser. 69, 323.
Harrison, R.A., Hood, A.W., Pike, C.D.: 2002, Astron. Astrophys. 392, 319.
Jelínek, P., Karlický, M.: 2009, Eur. Phys. J. D 54, 305.
Jelínek, P., Karlický, M.: 2010, IEEE Trans. Plasma Sci. 38, 2243.
Jelínek, P., Karlický, M.: 2012, Astron. Astrophys. 537, A46.
Jiang, Y., Shen, Y., Yi, B., Yang, J., Wang, J.: 2008, Astrophys. J. 677, 699.
Karlický, M., Jelínek, P., Mészárosová, H.: 2011, Astron. Astrophys. 529, A96.
Katsiyannis, A.C., Williams, D.R., McAteer, R.T.J., Gallagher, P.T., Keenan, F.P., Murtagh, F.: 2003, Astron. Astrophys. 406, 709.
Kerdraon, A., Delouis, J.-M.: 1997, In: G. Trottet (ed.) Coronal Physics from Radio and Space Observations, Lecture Notes in Physics, 483, Springer, Berlin, 192.
Khan, J.I., Aurass, H.: 2006, Astron. Astrophys. 457, 319.
Kliem, B., Dammasch, I.E., Curdt, W., Wilhelm, K.: 2002, Astrophys. J. Lett. 568, L61.
Longcope, D.W.: 2005, Living Rev. Solar Phys. 2, 7.
Marsh, M.S., De Moortel, I., Walsh, R.W.: 2011, Astrophys. J. 734, 81.
Marsh, M.S., Walsh, R.W., Plunkett, S.: 2009, Astrophys. J. 697, 1674.
McLaughlin, J.A., Hood, A.W., De Moortel, I.: 2011, Space Sci. Rev. 158, 205.
Mercier, C., Subramanian, P., Kerdraon, A., Pick, M., Ananthakrishnan, S., Janardhan, P.: 2006, Astron. Astrophys. 447, 1189.
Mészárosová, H., Karlický, M., Rybák, J.: 2011, Solar Phys. 273, 393.
Mészárosová, H., Karlický, M., Rybák, J., Jiřička, K.: 2009a, Astrophys. J. Lett. 697, L108.
Mészárosová, H., Karlický, M., Rybák, J., Jiřička, K.: 2009b, Astron. Astrophys. 502, L13.
Moon, Y.-J., Choe, G.S., Park, Y.D., Wang, H., Gallagher, P.T., Chae, J., et al.: 2002, Astrophys. J. 574, 434.
Nakariakov, V.M., Arber, T.D., Ault, C.E., Katsiyannis, A.C., Williams, D.R., Keenan, F.P.: 2004, Mon. Not. Roy. Astron. Soc. 349, 705.
Ofman, L., Wang, T.J.: 2008, Astron. Astrophys. 482, L9.
Pariat, E., Antiochos, S.K., DeVore, C.R.: 2009, Astrophys. J. 691, 61.
Priest, E.R., Démoulin, P.: 1995, J. Geophys. Res. 1002, 23443.
Priest, E.R., Pontin, D.I.: 2009, Phys. Plasmas 16(12), 122101.
Ravindra, B., Venkatakrishnan, P.: 2003, Solar Phys. 214, 267.
Roberts, B., Edwin, P.M., Benz, A.O.: 1983, Nature 305, 688.
Roberts, B., Edwin, P.M., Benz, A.O.: 1984, Astrophys. J. 279, 857.
Scherrer, P.H., Bogart, R.S., Bush, R.I., Hoeksema, J.T., Kosovichev, A.G., Schou, J., et al.: 1995, Solar Phys. 162, 129.
Schmieder, B., Aulanier, G.: 2003, Adv. Space Res. 32, 1875.
Schmieder, B., Démoulin, P., Aulanier, G., Golub, L.: 1996, Astrophys. J. 467, 881.
Schwab, F.R.: 1984, Astron. J. 89, 1076.
Shen, Y., Liu, Y., Su, J.: 2012, Astrophys. J. 750, 12.
Subramanian, P., White, S.M., Karlický, M., Sych, R., Sawant, H.S., Ananthakrishnan, S.: 2007, Astron. Astrophys. 468, 1099.
Swarup, G., Ananthakrishnan, S., Kapahi, V.K., Rao, A.P., Subrahmanya, C.R., Kulkarni, V.K.: 1991, Curr. Sci. 60, 95.
Titov, V.S., Hornig, G., Démoulin, P.: 2002, J. Geophys. Res. 107, 1164.
Tomczyk, S., McIntosh, S.W., Keil, S.L., Judge, P.G., Schad, T., Seeley, D.H., Edmondson, J.: 2007, Science 317, 1192.
Török, T., Panasenco, O., Titov, V.S., Mikić, Z., Reeves, K.K., Velli, M., et al.: 2011, Astrophys. J. Lett. 739, L63.
Torrence, C., Compo, G.P.: 1998, Bull. Am. Meteorol. Soc. 79, 61.
Trottet, G., Correia, E., Karlický, M., Aulanier, G., Yan, Y., Kaufmann, P.: 2006, Solar Phys. 236, 75.
Zuccarello, F., Contarino, L., Farnik, F., Karlicky, M., Romano, P., Ugarte-Urra, I.: 2011, Astron. Astrophys. 533, A100.
Acknowledgements
We are thankful to Dr. E. Dzifčáková for encouraging discussions. H.M. thanks Dr. J. Rybák for his help with the wavelet analysis that was performed using the software based on tools provided by C. Torrence and G.P. Compo at http://paos.colorado.edu/research/wavelets . H.M. acknowledges support from the PCI/INPE Grant 33/2011 of the National Space Research Institute in Brazil. H.M. and M.K. acknowledge support from the Grant GACR P209/12/0103, the research project RVO:67985815 of the Astronomical Institute AS and the Marie Curie PIRSES-GA-2011-295272 RadioSun project. J.D. and M.K. acknowledge support from the bilateral project No. SK-CZ-11-0153. J.D. also acknowledges the support from the Scientific Grant Agency, VEGA, Slovakia, Grant No. 1/0240/11, Grant No. P209/12/1652 of the Grant Agency of the Czech Republic, Collaborative grant SK-CZ-0153-11 and Comenius University Grant UK/11/2012. We also thank the staff of the GMRT who have made these observations available as well as the SoHO/MDI and SoHO/EIT consortia for their data. GMRT is run by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research.
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Mészárosová, H., Dudík, J., Karlický, M. et al. Fast Magnetoacoustic Waves in a Fan Structure Above a Coronal Magnetic Null Point. Sol Phys 283, 473–488 (2013). https://doi.org/10.1007/s11207-013-0243-6
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DOI: https://doi.org/10.1007/s11207-013-0243-6