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Daily and synoptic solar maps capture the Sun's magnetic field and helium line strength from 1985 onward. Data originates from the National Solar Observatory's Vacuum Telescope on Kitt Peak, Arizona. Observations are structured by Carrington rotation, with synoptic maps representing one full solar rotation each.
Magnetic field values in FITS files are stored as 16-bit integers with a bscale factor of 0.1; users must multiply by 0.1 to obtain physical values in gauss. A zero-level bias correction of -0.3 gauss is required for data from rotation 1762 onward.