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What determines the penumbral size and Evershed flow speed?

Published online by Cambridge University Press:  26 August 2011

Na Deng ,
Toshifumi Shimizu ,
Debi Prasad Choudhary  and
Haimin Wang
Na Deng
Affiliation:
Physics and Astronomy Department, California State University Northridge, 18111 Nordhoff St., Northridge, CA 91330, United States email: [email protected] Space Weather Research Laboratory, New Jersey Institute of Technology, 323 Martin Luther King Blvd., Newark, NJ 07102, United States
Toshifumi Shimizu
Affiliation:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
Debi Prasad Choudhary
Affiliation:
Physics and Astronomy Department, California State University Northridge, 18111 Nordhoff St., Northridge, CA 91330, United States email: [email protected]
Haimin Wang
Affiliation:
Space Weather Research Laboratory, New Jersey Institute of Technology, 323 Martin Luther King Blvd., Newark, NJ 07102, United States
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Abstract

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Using Hinode SP and G-band observations, we examined the relationship between magnetic field structure and penumbral length as well as Evershed flow speed. The latter two are positively correlated with magnetic inclination angle or horizontal field strength within 1.5 kilogauss, which is in agreement with recent magnetoconvective simulations of Evershed effect. This work thus provides direct observational evidence supporting the magnetoconvection nature of penumbral structure and Evershed flow in the presence of strong and inclined magnetic field.

Keywords

SunspotsSun: magnetic fieldsSun: atmospheric motionsSun: photosphere
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 216 - 220
Copyright
Copyright © International Astronomical Union 2011

References

Beck, C. 2008, Astron. Astrophys, 480, 825Google Scholar
Bellot Rubio, L. R., Balthasar, H., & Collados, M. 2004, Astron. Astrophys, 427, 319CrossRefGoogle Scholar
Borrero, J. M. 2009, Science in China G: Physics and Astronomy, 52, 1670CrossRefGoogle Scholar
Borrero, J. M., Lagg, A., Solanki, S. K., & Collados, M. 2005, Astron. Astrophys, 436, 333CrossRefGoogle Scholar
Deng, N., Liu, C., Yang, G., Wang, H., & Denker, C. 2005, Astron. Astrophys, 623, 1195Google Scholar
Deng, N., Prasad Choudhary, D., & Balasubramaniam, K. S. 2010, Astron. Astrophys, 719, 385Google Scholar
Hurlburt, N. E., Matthews, P. C., & Proctor, M. R. E. 1996, Astron. Astrophys, 457, 933Google Scholar
Hurlburt, N. E., Matthews, P. C., & Rucklidge, A. M. 2000, Solar Phys., 192, 109Google Scholar
Ichimoto, K., Tsuneta, S., Suematsu, Y., et al. 2008, Astron. Astrophys, 481, L9CrossRefGoogle Scholar
Kitiashvili, I. N., Kosovichev, A. G., Wray, A. A., & Mansour, N. N. 2009, Astrophys. J., 700, L178CrossRefGoogle Scholar
Langhans, K., Scharmer, G., Kiselman, D., Lófdahl, M., & Berger, T. 2005, Astron. Astrophys, 436, 1087CrossRefGoogle Scholar
Li, Y., Jing, J., Tan, C., & Wang, H. 2009, Science in China G: 52, 1702CrossRefGoogle Scholar
Liu, C., Deng, N., Liu, Y., Falconer, D., Goode, P., Denker, C., & Wang, H. 2005, Astron. Astrophys, 622, 722Google Scholar
Metcalf, T. R. 1994, Solar Phys., 155, 235Google Scholar
Montesinos, B. & Thomas, J. H. 1997, Nature, 390, 485CrossRefGoogle Scholar
Rempel, M., Schüssler, M., Cameron, R. H., & Knólker, M. 2009a, Science, 325, 171CrossRefGoogle Scholar
Rempel, M., Schüssler, M., & Knólker, M. 2009b, Astron. Astrophys, 691, 640Google Scholar
Scharmer, G. B. & Spruit, H. C. 2006, Astron. Astrophys, 460, 605CrossRefGoogle Scholar
Schlichenmaier, R., Jahn, K., & Schmidt, H. U. 1998, Astrophys. J., 493, L121Google Scholar
Solanki, S. K. & Montavon, C. A. P. 1993, Astron. Astrophys, 275, 283Google Scholar
Stanchfield, D. C. H., Thomas, J. H., & Lites, B. W. 1997, Astron. Astrophys, 477, 485Google Scholar
Sudol, J. J. & Harvey, J. W. 2005, Astron. Astrophys, 635, 647Google Scholar
Thomas, J. H., Weiss, N. O., Tobias, S. M., & Brummell, N. H. 2002, Nature, 420, 390Google Scholar
Title, A. M., Frank, Z. A., Shine, R. A., et al. 1993, Astron. Astrophys, 403, 780Google Scholar
Wang, H., Liu, C., Qiu, J., Deng, N., Goode, P. R., & Denker, C. 2004, Astrophys. J., 601, L195CrossRefGoogle Scholar