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  • The dataset is composed of the original sheets on which the fields were recorded by light on photographic paper. Normally one sheet holds the record from three magnetic field components, HDZ or XYZ, for 24 hours, sometimes with a record of temperature used to make instrumental corrections. Amberley (AML) 1919 - 1977 Eyrewell (EYR) 1978 – 1991 There is no overlap between Amberley and Eyrewell paper magnetograms. The very last paper magnetogram for EYR was recorded on 27 May 1991. The digital recording at EYR started on 29 June 1990 (sampling rate: 20 seconds). GNS Science have 20-second EYR pre-INTERMAGNET data available until they started to publish Definitive 1-minute Eyrewell (EYR) data via INTERMAGNET on 1 January 1994. DOI: https://doi.org/10.21420/F3JE-C208 Cite as: GNS Science. (2022). Amberley (AML) and Eyrewell (EYR) paper magnetograms . GNS Science. https://doi.org/10.21420/F3JE-C208

  • 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

  • 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

  • Preliminary 1-second and 1-minute Eyrewell (EYR) data are submitted to INTERMAGNET in a standardized file format (IAGA-2002) every hour. The data can be downloaded via a free web access provided by INTERMAGNET at http://www.intermagnet.org/data-donnee/download-eng.php (Data Type: ‘provisional’). 1-minute (Sample Rate: ‘minute’) ‘provisional’ EYR data are available since 1994. 1-second data (Sample Rate: ‘second’) ‘provisional’ EYR data are available since 2012. DOI: https://doi.org/10.21420/APJY-5050 Cite data as: GNS Science. (2022). Preliminary 1-second and 1-minute data from Eyrewell (EYR) [Data set]. INTERMAGNET. https://doi.org/10.21420/APJY-5050