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Using a recently developed two-scale formalism to determine the magnetichelicity spectrum (Brandenburg et al. 2017), we analyze synoptic vectormagnetograms built with data from the Vector Spectromagnetograph (VSM)instrument on the \emph{Synoptic Optical Long-term Investigations of the Sun}(SOLIS) telescope during January 2010-July 2016. In contrast to an earlierstudy using only three Carrington rotations, our analysis includes 74 synopticCarrington rotation maps. We recover here bihelical spectra at different phasesof solar cycle~24, where the net magnetic helicity in the majority of the datais consistent with a large-scale dynamo with helical turbulence operating inthe Sun. More than $20\%$ of the analyzed maps, however, show violations of theexpected sign rule.

Bihelical spectrum of solar magnetic helicity and its evolution