d3400581-df84-3af1-e054-002128a47908 English nonGeographicDataset non geographic dataset British Geological Survey +44 115 936 3100 Environmental Science Centre,Keyworth NOTTINGHAM NOTTINGHAMSHIRE NG12 5GG United Kingdom enquiries@bgs.ac.uk pointOfContact 2026-05-03 UK GEMINI 2.3 http://data.bgs.ac.uk/id/dataHolding/13607875 Digitised magnetogram data from three UK observatories (NERC Grant NE/P017231/1) 2021-12-14 creation http://data.bgs.ac.uk/id/dataHolding/13607875 Digitised magnetogram data from Lerwick, Eskdalemuir and Hartland for two large geomagnetic storms (March 1946 and August 1972). Data have been manually extracted using Enguage Digitizer and verified against hourly mean values from the World Data Centre for Geomagnetism Enquiries British Geological Survey 0115 936 3142 0115 936 3276 The Lyell Centre, Research Avenue South EDINBURGH LOTHIAN EH14 4AP United Kingdom enquiries@bgs.ac.uk distributor Enquiries British Geological Survey 0115 936 3142 0115 936 3276 The Lyell Centre, Research Avenue South EDINBURGH LOTHIAN EH14 4AP United Kingdom enquiries@bgs.ac.uk originator Enquiries British Geological Survey United Kingdom not available distributor Enquiries British Geological Survey United Kingdom not available distributor Enquiries British Geological Survey United Kingdom not available pointOfContact Enquiries British Geological Survey not available principalInvestigator notApplicable https://resources.bgs.ac.uk/images/geonetworkThumbs/d3400581-df84-3af1-e054-002128a47908.png Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Geomagnetic stations BGS Thesaurus of Geosciences 2022 revision NGDC Deposited Data Citable Data dataCentre NERC_DDC otherRestrictions licenceOGL Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" otherRestrictions The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused. Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" English geoscientificInformation 1946-03-27 1972-08-07 IAGA-2002 (Data exchange format) Enquiries British Geological Survey 0115 936 3142 0115 936 3276 The Lyell Centre, Research Avenue South EDINBURGH LOTHIAN EH14 4AP United Kingdom enquiries@bgs.ac.uk distributor Enquiries British Geological Survey United Kingdom not available distributor Enquiries British Geological Survey United Kingdom not available distributor https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item170970 WWW:DOWNLOAD-1.0-http--download Data download https://doi.org/10.5285/2d39fb6c-debb-408d-8abf-0298eebbf06d WWW:LINK-1.0-http--related Citation Information - Digital Object Identifier (DOI) Beggan, C.D., Eaton, E.M., Williamson, J., Maume, E., Humphries, T.S., Clarke, E. (2021). Digitised magnetogram data from three UK observatories. NERC EDS National Geoscience Data Centre. (Dataset). https://doi.org/10.5285/2d39fb6c-debb-408d-8abf-0298eebbf06d information nonGeographicDataset non geographic dataset INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology 2011 publication See the referenced specification false Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF false Over the past two centuries, observatories measured the daily field variations using light-sensitive photographic paper to produce analogue magnetograms. Around 350,000 magnetograms have been digitally photographed at high-resolution. However, converting the traces to digital values is difficult and time consuming as the magnetograms can have over-lapping lines, low quality recordings and obscure metadata for conversion to SI units. We digitised the traces from two large geomagnetic storms and cross-checked the final digitised values with the recorded hourly mean values from observatory years books.