Open AccessReversal magnetic chirality of solar active regions and a possible dynamo model
Author(s) -
Zhang Hongqi
Publication year - 2012
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2011.19745.x
Subject(s) - physics , helicity , magnetic helicity , convection zone , dynamo , solar dynamo , magnetic field , chirality (physics) , magnetic flux , astrophysics , convection , mercury's magnetic field , dynamo theory , interplanetary magnetic field , quantum electrodynamics , mechanics , solar wind , quantum mechanics , symmetry breaking , chiral symmetry breaking , nambu–jona lasinio model
The transfer of magnetic chirality in solar active regions is related to the emerging magnetic flux ropes generated in the subatmosphere. This analysis has been presented based on the calculation of the injection of magnetic helicity at the solar surface. As the long‐term evolution of the accumulated magnetic helicity is followed, it is found that the transfer of reversal magnetic helicity of active regions is a complex process, and is not monotonic with the same sign. It is found that the dominant contribution of helicity occurs mainly in the fast‐developing stage of active regions. By considering the hemispheric trends of magnetic helicity, it is proposed that the reversal helicity in solar active regions has two possible causes: local generation in the convection zone, and trans‐equatorial processes in the subatmosphere. In addition to the mirror‐symmetrical reverse of twisted magnetic field in the convection zone, the possibility of a trans‐equatorial process is discussed in this paper.