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Two-scale analysis of solar magnetic helicity View all abstracts by submitter

Axel Brandenburg   Submitted: 2017-12-12 04:33

We develop a two-scale formalism to determine global magnetic helicity spectra in systems where the local magnetic helicity has opposite signs on both sides of the equator, giving rise to cancelation with conventional methods. We verify this approach using first a synthetic one-dimensional magnetic field and then two-dimensional slices from a three-dimensional α effect-type dynamo-generated magnetic field with forced turbulence of opposite helicity above and below the midplane of the domain. We then apply this formalism to global solar synoptic vector magnetograms. To improve the statistics, data from three consecutive Carrington rotations (2161-2163) are combined into a single map. We find that the spectral magnetic helicity representative of the northern hemisphere is negative at all wavenumbers and peaks at ~ 0.06 Mm-1 (scales around 100 Mm). There is no evidence of bihelical magnetic fields that are found in three-dimensional turbulence simulations of helicity-driven α effect-type dynamos.

Authors: Brandenburg, A., Petrie, G. J. D., & Singh, N. K.
Projects: None

Publication Status: Astrophys. J. 836, 21 (2017)
Last Modified: 2017-12-13 07:55
Go to main E-Print page  Studying the transfer of magnetic helicity in solar active regions with the connectivity-based helicity flux density method  Determination of Linear Force-Free Magnetic Field Constant Alpha Using Deep Learning  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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