On the origin of current helicity in active regions

K. Petrovay, P. Chatterjee, A. Choudhuri

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Observations indicate that solar active region magnetic fields have a predominantly negative (positive) helicity in the northern (southern) hemisphere. This helicity is likely to have a subsurface origin. One possible explanation for the helicity is that the rising toroidal flux tube causing the active region collects flux from the general poloidal magnetic field of the Sun. This flux first wraps around the rising tube, then slowly penetrates it by turbulent diffusion. Here we present recent results concerning how this nonlinear diffusion proceeds. The models show that with a plausible choice of assumptions a mean twist comparable to the observations results.

Original languageEnglish
Title of host publicationProceedings of SOHO-17
Subtitle of host publication10 Years of SOHO and Beyond
Publication statusPublished - Jul 1 2006
EventSOHO-17: 10 Years of SOHO and Beyond - Sicily, Italy
Duration: May 7 2006May 12 2006

Publication series

NameEuropean Space Agency, (Special Publication) ESA SP
ISSN (Print)0379-6566


OtherSOHO-17: 10 Years of SOHO and Beyond


  • MHD
  • Magnetohydrodynamics
  • Sun

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science

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    Petrovay, K., Chatterjee, P., & Choudhuri, A. (2006). On the origin of current helicity in active regions. In Proceedings of SOHO-17: 10 Years of SOHO and Beyond (617 ed.). (European Space Agency, (Special Publication) ESA SP; No. 617).