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We compute magnetic helicity and energy spectra from about 2485 patches ofabout 100 megameters (Mm) side length on the solar surface using data fromHinode during 2006--2017. An extensive database is assembled where we listmagnetic energy and helicity, large- and small-scale magnetic helicity, meancurrent helicity density, fractional magnetic helicity, and correlation lengthalong with the Hinode map identification number (MapID), as well as Carringtonlatitude and longitude for each MapID. While there are departures from thehemispheric sign rule for magnetic and current helicities, the weak trendreported here is in agreement with the previous results. This is argued to be aphysical effect associated with the dominance of individual active regions thatcontribute more strongly in the better resolved Hinode maps. In comparison withearlier work, the typical correlation length is found to be 6-8 Mm, while thelength scale relating magnetic and current helicity to each other is found tobe around 1.4 Mm.

Spectral magnetic helicity of solar active regions between 2006 and 2017