Abstract
A comparison between the two tracers of magnetic field mirror asymmetry in solar active regions – twist and current helicity – is presented. It is shown that for individual active regions these tracers do not possess visible similarity but averaging by time over the solar cycle, or by latitude, reveals similarities in their behavior. The main property of the data set is antisymmetry over the solar equator. Considering the evolution of helical properties over the solar cycle we find signatures of a possible sign change at the beginning of the cycle, though more systematic observational data are required for a definite confirmation. We discuss the role of both tracers in the context of solar dynamo theory.
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References
Abramenko, V.I., Wang, T.J., Yurchishin, V.B.: 1996, Solar Phys. 168, 75.
Abramenko, V.I., Wang, T.J., Yurchishin, V.B.: 1997, Solar Phys. 174, 291.
Bao, S.D., Zhang, H.Q.: 1998, Astrophys. J. 496, L43.
Bao, S.D., Ai, G.X., Zhang, H.Q.: 2000, J. Astrophys. Astron. 21, 303.
Bao, S.D., Ai, G.X., Zhang, H.Q.: 2002, In: Rickman, H. (ed.) IAU Highlights Astron. 12, 392.
Choudhuri, A.R., Chatterjee, P., Nandy, D.: 2004, Astrophys. J. 615, L57.
Gizon, L., Duvall, T.L. Jr., Schou, J.: 2003, Nature 421, 43.
Hagino, M., Sakurai, T.: 2005, Publ. Astron. Soc. Japan 57, 481.
Ivanov, E.V.: 2004, In: Stepanov, A.V., Benevolenskaya, E.E., Kosovichev, A.G. (eds.) Multi-Wavelength Investigations of Solar Activity, IAU Symp. 223, 261.
Kleeorin, N., Rogachevskii, I.: 1999, Phys. Rev. E 59, 6724.
Kleeorin, N., Kuzanyan, K., Moss, D., Rogachevskii, I., Sokoloff, D., Zhang, H.: 2003, Astron. Astrophys. 409, 1097.
Kuzanyan, K.M., Bao, S., Zhang, H.: 2000, Solar Phys. 191, 231.
Parker, E.N.: 1955, Astrophys. J. 122, 293.
Parker, E.N.: 1974, Solar Phys. 36, 249.
Parker, E.N.: 1976, Astrophys. J. 204, 259.
Pevtsov, A.A., Canfield, R.C., Metchalf, T.R.: 1994, Astrophys. J. 425, L117.
Ponomarenko, Yu.B.: 1972a, Astron. Rep. 49, 148.
Ponomarenko, Yu.B.: 1972b, Astron. Rep. 49, 568.
Rust, D.M., Kumar, A.: 1996, Astrophys. J. 464, L119.
Seehafer, N.: 1990, Solar Phys. 125, 219.
Sokoloff, D., Bao, S.D., Kleeorin, N., Kuzanyan, K., Moss, D., Rogachevskii, I., Tomin, D., Zhang, H.: 2006, Astron. Nachr. 327, 876.
Tang, Y.Q., Le, G.M.: 2005, In: Acharya, B.S., Gupta, S., Jagadeesan, P., Jain, A., Karthikeyan, S., Morris, S., Tonwar, S. (eds.) Proc. 29-th International Cosmic Ray Conference, 1, Tata Institute of Fundamental Research, 5.
Wang, T.J., Ai, G.X., Deng, Y.Y.: 1996, Publ. Beijing Astron. Obs. 28, 31.
Woltjer, L.: 1958, Proc. Natl. Acad. Sci. USA 44, 489.
Xu, H., Gao, Y., Zhang, H., Sakurai, T., Pevtsov, A.A., Sokoloff, D.: 2007, Adv. Space Res. 39, 1715.
Zhang, H., Bao, S.: 1998, Astron. Astrophys. 339, 880.
Zhang, H., Bao, S., Kuzanyan, K.M.: 2002, Astron. Rep. 46, 414.
Zhang, H., Sokoloff, D., Rogachevskii, I., Moss, D., Lamburt, V., Kuzanyan, K., Kleeorin, N.: 2006, Monthly Notices Roy. Astron. Soc. 365, 276.
Zhao, J., Kosovichev, A.G., Duvall, T.L.: 2004, Astrophys. J. 607, L135.
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Sokoloff, D., Zhang, H., Kuzanyan, K.M. et al. Current Helicity and Twist as Two Indicators of the Mirror Asymmetry of Solar Magnetic Fields. Sol Phys 248, 17–28 (2008). https://doi.org/10.1007/s11207-008-9121-z
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DOI: https://doi.org/10.1007/s11207-008-9121-z