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Rapid changes of sunspot structure associated with solar eruptions

Published online by Cambridge University Press:  26 August 2011

Haimin Wang  and
Chang Liu
Haimin Wang
Affiliation:
Space Weather Research Lab, New Jersey Institute of Technology, Newark, NJ 07102, USA email: [email protected]
Chang Liu
Affiliation:
Space Weather Research Lab, New Jersey Institute of Technology, Newark, NJ 07102, USA email: [email protected]
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Abstract

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In this paper we summarize the studies of flare-related changes of photospheric magnetic fields. When vector magnetograms are available, we always find an increase of transverse field at the polarity inversion line (PIL). We also discuss 1 minute cadence line-of-sight MDI magnetogram observations, which usually show prominent changes of magnetic flux contained in the flaring δ spot region. The observed limb-ward flux increases while disk-ward flux decreases rapidly and irreversibly after flares. These observations provides evidences, either direct or indirect, for the theory and prediction of Hudson, Fisher & Welsch (2008) that the photospheric magnetic fields would respond to coronal field restructuring and turn to a more horizontal state near the PIL after eruptions. From the white-light observations, we find that at flaring PIL, the structure becomes darker after an eruption, while the peripheral penumbrae decay. Using high-resolution Hinode data, we find evidence that only dark fibrils in the “uncombed” penumbral structure disappear while the bright grains evolve to G-band bright points after flares.

Keywords

Sun: activitysun: flaressun: coronal mass ejections (CMEs)sun: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 15 - 20
Copyright
Copyright © International Astronomical Union 2011

References

Antiochos, S. K., DeVore, C. R., & Klimchuk, J. A., 1999, ApJ, 510, 485CrossRefGoogle Scholar
Chen, J., Wang, H., Zirin, H., & Ai, G., 1994, Solar Phys., 154, 261CrossRefGoogle Scholar
Chen, W., Liu, C., & Wang, H., 2007, ChJAA, 7, 733Google Scholar
Deng, N., Liu, C., Yang, G., & Wang, H., Denker, C., 2005, ApJ, 623, 1195CrossRefGoogle Scholar
Fisher, G. H., Bercik, D. J., Welsch, B. T., & Hudson, H. S., 2010, arXiv:1006.5247Google Scholar
Hagyard, et al. , 1999, Solar Phys., 184, 133CrossRefGoogle Scholar
Hudson, H. S., Fisher, G. H., & Welsch, B. T., 2008, ASP Conference Series, 383, 221Google Scholar
Jing, J., Wiegelmann, T., Suematsu, Y., Kubo, M., & Wang, H., 2008, ApJL, 676, L81CrossRefGoogle Scholar
Klimchuck, J. A., 1990, ApJ, 354, 745CrossRefGoogle Scholar
Kopp, R. A. & Pneuman, G. W., 1976, Solar Phys., 50, 85CrossRefGoogle Scholar
Kosovichev, A. G. & Zharkova, V. V. 2001, ApJL, 550, L105CrossRefGoogle Scholar
Langhans, K., Scharmer, G. B., Kiseman, D., Lofdahl, M. G., & Berger, T. E., 2005, A&A, 436, 1087Google Scholar
Li, Y., Jing, J., Fan, Y., & Wang, H., 2010, this proceedingGoogle Scholar
Liu, C., Deng, N., Liu, Y., Falconer, D., Goode, P. R., Denker, C., & Wang, H., 2005, ApJ, 622, 722CrossRefGoogle Scholar
Spirock, T. J., Yurchyshyn, V. B., & Wang, H., 2002, ApJ, 572, 1072CrossRefGoogle Scholar
Sudol, J. J. & Harvey, J. W., 2005, ApJ, 635, 647CrossRefGoogle Scholar
Wang, H., 1992, Solar Phys., 140, 85CrossRefGoogle Scholar
Wang, H., 2006, ApJ, 649, 490CrossRefGoogle Scholar
Wang, H. & Liu, C., 2010, ApJL, 716, L195CrossRefGoogle Scholar
Wang, H., Ewell, M. W., Zirin, H., & Ai, G. 1994, ApJ, 424, 436CrossRefGoogle Scholar
Wang, H., Liu, C., Qiu, J., Deng, N., Goode, P. R., & Denker, C., 2004b, ApJL, 601, L195CrossRefGoogle Scholar
Wang, H., Liu, C., Zhang, H. & Deng, Y, 2005, ApJ, 627, 1031CrossRefGoogle Scholar
Wang, H., Qiu, J., Jing, J., Spirock, T. J., & Yurchyshyn, V., 2004a, ApJ, 605, 931CrossRefGoogle Scholar
Wang, H., Spirock, T. J., Qiu, J., Ji, H., Yurchyshyn, V., Moon, Y. J., Denker, C., & Goode, P. R., 2002, ApJ, 576, 497CrossRefGoogle Scholar
Yurchyshyn, V. B., Wang, H., Abramenko, V., Spirock, T. J., & Krucker, S., 2004, ApJ, 605, 546CrossRefGoogle Scholar