Bihelical Spectrum of Solar Magnetic Helicity and Its Evolution

Nishant K. Singh, Maarit J. Käpylä, Axel Brandenburg, Petri J. Käpylä, Andreas Lagg, Ilpo Virtanen

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

8 Sitaatiot (Scopus)
164 Lataukset (Pure)

Abstrakti

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.

AlkuperäiskieliEnglanti
Artikkeli182
Sivut1-11
JulkaisuAstrophysical Journal
Vuosikerta863
Numero2
DOI - pysyväislinkit
TilaJulkaistu - 20 elokuuta 2018
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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