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  • 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