Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-17T21:35:04.760Z Has data issue: false hasContentIssue false
  • English
  • Français

Technique for Inferring Magnetic Helicity of Active Regions

Published online by Cambridge University Press:  30 March 2016

Jongchul Chae  and
Yong-Jae Moon
Jongchul Chae
Affiliation:
Astronomy Program, SEES, Seoul National University, Seoul 151-742, Korea
Yong-Jae Moon
Affiliation:
Korea Astronomy Observatory, Whaamdong, Yooseong-ku, Daejeon 305-348, Korea

Abstract

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.

We provide the rationale for the wide applicability of the LCT method for inferring the magnetic helicity of an active region, with an illustrative application made to NOAA 10365. We also report that the determined rate of helicity change is not much sensitive to the free parameters of the LCT method. The application of the method to active regions by several investigators has produced results suggesting that the magnetic helicity of a major active region with flux 1022 Mx may be usually of the order of 1043 Mx2 or less, being twisted at most 0.1 turns as a whole.

Type
I. Joint Discussions
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 109 - 112
Copyright
Copyright © Astronomical Society of Pacific 2005

References

Berger, M. A., & Field, G. B. 1984, J. Fluid Mech., 147, 133 Google Scholar
Chae, J. 2001, ApJ, 560, L95 CrossRefGoogle Scholar
Chae, J., Wang, H., Qiu, J., Goode, P. R., Strous, L., & Yun, H. S. 2001, ApJ, 560, 476 Google Scholar
Demoulin, P. & Berger, M. A. 2003, Solar Physics, 215, 203 Google Scholar
Kusano, K., Maeshiro, T., Yokoyama, T., & Sakurai, T. 2002, ApJ, 577, 501 Google Scholar
Moon, Y.-J., Chae, J., Choe, G. S., Wang, H., Park, Y. D., Yun, H. S., Yurchyshyn, V., & Goode, P. R. 2002a, ApJ, 574, 1066 Google Scholar
Moon, Y.-J., Chae, J., Wang, H., Choe, G. S., & Park, Y. D. 2002b, ApJ, 580, 528 Google Scholar
Nindos, A. & Zhang, H. 2002, ApJ, 573, L133 Google Scholar
Nindos, A., Zhang, J., & Zhang, H. 2003, ApJ, 594, 1033 Google Scholar