Hostname: page-component-848d4c4894-pjpqr Total loading time: 0 Render date: 2024-07-01T23:23:19.987Z Has data issue: false hasContentIssue false
  • English
  • Français

Connections beween photospheric current helicity, flares and solar subsurface kinetic helicity

Published online by Cambridge University Press:  18 July 2013

Yu Gao ,
Junwei Zhao  and
Hongqi Zhang
Yu Gao
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, P. R. China email: gy@bao.ac.cn
Junwei Zhao
Affiliation:
W.W.Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA94305-4085, U.S.A.
Hongqi Zhang
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, P. R. China email: gy@bao.ac.cn
Rights & Permissions [Opens in a new window]

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The α-effect is central to magnetic field generation in αΩ dynamo theory (Parker, 1955), however, it lacked observational and experimental supports over a long term (Sokoloff, 2007). Mirror asymmetries of magnetic field (magnetic helicity) were not observed until the recent 20 years (Seehafer, 1990; Pevtsov et al., 1995, Bao & Zhang, 1998). Later, the advancement in local helioseismology has made possible the measurements of solar subsurface velocity field and the vorticity (or kinetic helicity) as well (Zhao & Kosovichev, 2003). Apparently, frozen flow with the magnetic field in the fluid of high magnetic Reynold number is a necessary condition for the α-effect in the framework of Parker's dynamo model.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 531 - 532
Copyright
Copyright © International Astronomical Union 2013 

References

Bao, S. D. & Zhang, H. Q. 1998, ApJ., 496, L43 CrossRefGoogle Scholar
Gao, Y., Zhang, H., & Zhao, J. 2009, MNRAS., 394, L79 CrossRefGoogle Scholar
Hoeksema, J. T., Liu, Y., & Hayashi, K. 2012, Sol. Phys., in pressGoogle Scholar
Komm, R. W., Corbard, T., Durney, B. R., Gonzalez Hernandez, I., Hill, F., Howe, R., & Toner, C. 2004a, ApJ., 605, 554 Google Scholar
Komm, R. W., Howe, R., Gonzalez Hernandez, I., Hill, F., Haber, D., Hindman, B., & Corbard, T. 2004b, in SOHO 14 Helio- and Asteroseismology: Towards a Golden Future, ed. Danesy, D. (ESA SP-559; Noordwijk: ESA), 520 Google Scholar
Komm, R., Howe, R., Hill, F., Gonzalez Hernandez, I., & Toner, C. 2005, ApJ, 630, 1184 CrossRefGoogle Scholar
Mason, D., Komm, R., Hill, F., Howe, R., Haber, D., & Hindman, B. 2006, ApJ, 645, 1543 CrossRefGoogle Scholar
Maurya, R. A., Ambastha, A., & Reddy, V. 2011, J. Phys. Conf. Ser., 271, 012003 Google Scholar
Parker, E. 1955, ApJ, 122, 293 Google Scholar
Pevtsov, A. A., Canfield, R. C., & Metcalf, T. R. 1995, ApJ, 440, L109 Google Scholar
Reinard, A. A., Henthorn, J., Komm, R., & Hill, F. 2010, ApJ., 710, L121 CrossRefGoogle Scholar
Seehafer, N. 1990, SoPh, 125, 219 Google Scholar
Sokoloff, D. 2007, Plasma Phys. Control. Fusion, 49, 447 Google Scholar
Zhao, J., Couvidat, S., Bogart, R. S., Parchevsky, K. V., Birch, A. C., Duvall, T. L. Jr., Beck, J. G., Kosovichev, A. G., & Scherrer, P. H. 2012, SoPh, 275, 375 Google Scholar
Zhao, J. & Kosovichev, A. G. 2003, ApJ., 591, 446 CrossRefGoogle Scholar
Zhao, J. & Kosovichev, A. G. 2004, ApJ., 603, 776 Google Scholar
Zhao, J. 2004, Chap. 5, PhD Thesis, Stanford Univ.Google Scholar