Current Helicity and Twist as Two Indicators of The Mirror Asymmetry of solar Magnetic Fields

Abstract

A comparison between the two tracers of magnetic field mirror asymmetry in solar active regions, twist and current helicity, is presented. It is shown that for individual active regions these tracers do not possess visible similarity while averaging by time over the solar cycle, or by latitude, reveals similarities in their behaviour. The main property of the dataset is anti-symmetry over the solar equator. Considering the evolution of helical properties over the solar cycle we find signatures of a possible sign change at the beginning of the cycle, though more systematic observational data are required for a definite confirmation. We discuss the role of both tracers in the context of the solar dynamo theory.

arXiv comment14 pages, 6 figures

References in corpus (5)

• Solar supergranulation as a wavelike phenomenon
• Magnetic Helicity Tensor for an Anisotropic Turbulence
• Magnetic Helicity Evolution During the Solar Activity Cycle: Observations and Dynamo Theory
• The Radial Distribution of Magnetic Helicity in the Solar Convective Zone: Observations and Dynamo Theory
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Cited by in corpus (4)

• New dynamo pattern revealed by solar helical magnetic fields
• Solar Dynamo Model with Diamagnetic Pumping and Nonlocal Alpha-Effect
• Statistical distribution of current helicity in solar active regions over the magnetic cycle
• Helicity at Photospheric and Chromospheric Heights