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Spectral Magnetic Helicity of Solar Active Regions between 2006 and 2017
Natl Solar Observ, 3665 Discovery Dr, Boulder, CO 80303 USA..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.;Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, SE-10691 Stockholm, Sweden.;Univ Colorado, JILA, Boulder, CO 80303 USA.;Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA.;Carnegie Mellon Univ, McWilliams Ctr Cosmol, Pittsburgh, PA 15213 USA.;Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA..ORCID iD: 0000-0002-7304-021X
2019 (English)In: ASTROPHYSICAL JOURNAL, Vol. 882, no 2, article id 80Article in journal (Refereed) Published
Abstract [en]

We compute magnetic helicity and energy spectra from about 2485 patches of about 100 Mm side length on the solar surface using data from Hinode during 2006-2017. An extensive database is assembled where we list the magnetic energy and helicity, large- and small-scale magnetic helicity, mean current helicity density, fractional magnetic helicity, and correlation length along with the Hinode map identification number (MapID), as well as the Carrington latitude and longitude for each MapID. While there are departures from the hemispheric sign rule for magnetic and current helicities, the weak trend reported here is in agreement with the previous results. This is argued to be a physical effect associated with the dominance of individual active regions that contribute more strongly in the better-resolved Hinode maps. In comparison with earlier work, the typical correlation length is found to be 6-8 Mm, while the length scale relating the magnetic and current helicities to each other is around 1.4 Mm.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 882, no 2, article id 80
Keywords [en]
dynamo, magnetohydrodynamics (MHD), Sun: magnetic fields, turbulence
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-261012DOI: 10.3847/1538-4357/ab32efISI: 000484547700007OAI: oai:DiVA.org:kth-261012DiVA, id: diva2:1356950
Note

QC 20191002

Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-02Bibliographically approved

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Brandenburg, Axel

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