Nearly 22,000 paper magnetograms were scanned into images by New Zealand Micrographic Services (NZMS) in 2021-2022. The formats are .jpg and .tiff. The scanning was done in greyscale, at 600dpi, and the original ratio was preserved. Monthly contact sheets as a preview option are available. Amberley (AML) 1919 - 1977 Eyrewell (EYR) 1978 – 1991 DOI: https://doi.org/10.21420/ZN6T-QZ22 Cite data as: GNS Science. (2022). Amberley (AML) and Eyrewell (EYR) scanned magnetograms [Data set]. GNS Science. https://doi.org/10.21420/ZN6T-QZ22

Annual mean values (yearmean.eyr) since 1902. Annual reports (or yearbooks) for Christchurch Magnetic Observatory and Amberley Magnetic Observatory providing more information (metadata) around the data recordings. Link to EYR k-index values https://data.gns.cri.nz/metadata/srv/eng/catalog.search#/metadata/d9ff1898-f1ea-4e69-a533-82e730708264 DOI: https://doi.org/10.21420/5WPF-SB23 Cite data as: GNS Science. (2022). Amberley (AML) and Eyrewell (EYR) supplementary data [Data set]. GNS Science. https://doi.org/10.21420/5WPF-SB23