The dataset is composed of the Eyrewell (EYR) geomagnetic vector field measurements with the highest resolution available for 2000 to 2017, a time period of interest for the research publications by Rodger et al. (2017), Smith et al. (2021), and Hartinger et al. (2023). The resolution varies between 20-second (20s), 5-second (5s), and 1-second (1s). The data are processed, except for the 2002 and 2003 data. A new data recording system was installed on 16 February 2005 and upgraded to a faster one on 26 February 2010. The observatory location changed by 6 km on 3 December 2013. Adjustments need to be applied to get a continuous record. The values for the difference between the old and new site are D = 2.73 arcmin, I = 0.58 arcmin, and F = 14.7 nT. Overview: 2000 20s resolution 2001 20s resolution 2002 5s resolution (raw data) 2003 5s resolution (raw data) 2004 20s resolution 2005 5s & 20s resolutions 2006 5s resolution 2007 5s resolution 2008 5s resolution 2009 5s resolution 2010 1s & 5s resolutions 2011-onwards 1s resolution The 1-second data since 14-Sep-2011 is available for download on INTERMAGNET. https://intermagnet.github.io/ The dataset was used to create a sub-dataset that contains only the horizontal magnitude of the EYR geomagnetic field measurements provided in units of nT at 5s resolution. The sub-dataset is available in a MATLAB format on Zenodo. EYR5sec10292003.mat. https://doi.org/10.5281/zenodo.7261515 Cite dataset as: GNS Science (2023). Eyrewell (EYR) best resolution data 2000 - 2017 [Dataset]. https://doi.org/10.21420/BVEZ-T482

The dataset is composed of the original sheets on which the fields were recorded by light on photographic paper. Each sheet holds 24 hours of three recorded magnetic field components. Most of the components were labelled XYZ; some were labelled DHZ (e.g. 1991 magnetograms), and others were not labelled at all (e.g. 1966 magnetograms). Scott Base (SBA) 1957 – 1991 DOI: https://doi.org/10.21420/3KT9-3M51 Cite as: GNS Science. (2022). Scott Base (SBA) paper magnetograms . GNS Science. https://doi.org/10.21420/3KT9-3M51

Preliminary 1-second and 1-minute Scott Base (SBA) 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’ SBA data are available since 1996. 1-second data (Sample Rate: ‘second’) ‘provisional’ SBA data are available since 2012. DOI: https://doi.org/10.21420/TTQ0-SR11 Cite data as: GNS Science. (2022). Preliminary 1-second and 1-minute data from Scott Base (SBA) [Data set]. INTERMAGNET. https://doi.org/10.21420/TTQ0-SR11

2021 Definitive 1-minute Scott Base (SBA) data is continuous 1-second data recorded by New Zealand's Geomagnetic Observatories SBA in 2021 that was processed at 1-minute sampling, cleaned (spikes removed) and baseline (absolute values) corrected following INTERMAGNET guidelines. The data was submitted to INTERMAGNET in May 2022 and passed the INTERMAGNET reviewing process. DOI https://doi.org/10.21420/b0yc-rk98 Cite as: Thornton, M., McGaw, J., Tran, H., Shaw, S. (2021). 2021 Definitive 1-minute Scott Base (SBA) data. GNS Science, INTERMAGNET. https://doi.org/10.21420/b0yc-rk98

2022 Definitive 1-minute Scott Base (SBA) data is continuous 1-second data recorded by New Zealand's Geomagnetic Observatories SBA in 2022 that was processed at 1-minute sampling, cleaned (spikes removed) and baseline (absolute values) corrected following INTERMAGNET guidelines. The data was submitted to INTERMAGNET in May 2023 and passed the INTERMAGNET reviewing process. DOI https://doi.org/10.21420/axhk-e303 Cite as: Thornton, M., Goodyear, G., Shaw, S. (2022). 2022 Definitive 1-minute Scott Base (SBA) data. GNS Science, INTERMAGNET. https://doi.org/10.21420/axhk-e303

Continuous data recorded by New Zealand's Geomagnetic Observatories EYR, SBA & API, processed at 1-minute and 1-second sampling, and submitted to INTERMAGNET in a standardized file format (IAGA-2002) every hour. The data are preliminary as they are submitted without being cleaned (spikes removed) and baseline (absolute values) corrected. The preliminary 1-minute data are more timely and potentially more complete than the definitive 1-minute data, whereas the 1-minute definitive data goes through a data quality reviewing process with data recorded in one year not being published until the following year. There are no 1-second definitive data being produced. 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 data (Sample Rate: ‘minute’): EYR available since 1994, SBA since 1996, and API since 1999. 1-second data (Sample Rate: ‘second’): EYR data available since 2012, SBA since 2012, and API since 2012.

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

Continuous data recorded by New Zealand's Geomagnetic Observatories EYR processed at 1-minute sampling and baseline (absolute values) corrected. The data is being submitted to INTERMAGNET annually (submitted by July 1st for the previous year’s data Jan 1 to 31 Dec). EYR data since 1-Jan-1994 Before the definitive data for each year is being published via INTERMAGNET an international multi-step reviewing process is being applied to ensure international standards are being met. DOI https://doi.org/10.21420/VTW2-AE75 Cite as: GNS Science. (1994). Definitive 1-minute Eyrewell (EYR) data [Data set]. GNS Science, INTERMAGNET. https://doi.org/10.21420/VTW2-AE75

2017 Definitive 1-minute Apia (API) data is continuous 1-second data recorded by New Zealand's Geomagnetic Observatory Apia in 2017 that was processed at 1-minute sampling, cleaned (spikes removed) and baseline (absolute values) corrected. The data was submitted to INTERMAGNET in July 2018 and passed the INTERMAGNET reviewing process. DOI https://doi.org/10.21420/Y89S-Y383 Cite as: Petersen, T., GNS Science, Samoa Meteorology Division, & USGS. (2018). 2017 Definitive 1-minute Apia (API) data. GNS Science, INTERMAGNET. https://doi.org/10.21420/Y89S-Y383

2014 Definitive 1-minute Apia (API) data is continuous 1-second data recorded by New Zealand's Geomagnetic Observatory Apia in 2014 that was processed at 1-minute sampling, cleaned (spikes removed) and baseline (absolute values) corrected. The data was submitted to INTERMAGNET in July 2015 and passed the INTERMAGNET reviewing process. DOI https://doi.org/10.21420/V2NJ-6T19 Cite as: Petersen, T., GNS Science, Samoa Meteorology Division, & USGS. (2015). 2014 Definitive 1-minute Apia (API) data. GNS Science, INTERMAGNET. https://doi.org/10.21420/V2NJ-6T19