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  Bihelical Spectrum of Solar Magnetic Helicity and Its Evolution

Singh, N. K., Käpylä, M. J., Brandenburg, A., Käpylä, P. J., Lagg, A., & Virtanen, I. (2018). Bihelical Spectrum of Solar Magnetic Helicity and Its Evolution. The Astrophysical Journal, 863(2): 182. doi:10.3847/1538-4357/aad0f2.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-9204-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-9205-2
Genre: Journal Article

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 Creators:
Singh, Nishant K.1, Author              
Käpylä, Maarit J.1, 2, Author              
Brandenburg, Axel, Author
Käpylä, Petri J.1, 2, Author
Lagg, Andreas2, Author              
Virtanen, Ilpo, Author
Affiliations:
1Max Planck Research Group in Solar and Stellar Magnetic Activity, Max Planck Institute for Solar System Research, Max Planck Society, ou_2265638              
2Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              

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Free keywords: dynamo; magnetohydrodynamics (MHD) ; Sun: magnetic fields; turbulence
 Abstract: Using a recently developed two-scale formalism to determine the magnetic helicity spectrum, we analyze synoptic vector magnetograms built with data from the Vector Spectromagnetograph instrument on the Synoptic Optical Long-term Investigations of the Sun telescope during 2010 January–2016 July. In contrast to an earlier study using only three Carrington rotations (CRs), our analysis includes 74 synoptic CR maps. We recover here bihelical spectra at different phases of solar cycle 24, where the net magnetic helicity in the majority of the data is consistent with a large-scale dynamo with helical turbulence operating in the Sun. More than 20% of the analyzed maps, however, show violations of the expected sign rule.

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Language(s): eng - English
 Dates: 2018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-4357/aad0f2
 Degree: -

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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 863 (2) Sequence Number: 182 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3