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The longest time series of geomagnetic data are certainly the ones acquired by magnetic observatories (Fig.

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International Data Week 2018, coming for the first time to Africa, will take place on 5–8 November 2018, in Gaborone, Botswana.Since the beginning of the 1960’s (the birth of the World Data Centre system established in 1957 provided archives for the observational data resulting from the 'International Geophysical Year'), magnetic observatories data have been mostly publicly available (Fig. Getting access to a network of stations is much more interesting than having access to just one isolated observatory.The cooperative spirit within the geomagnetic community thus knows a fairly long-standing history that has had to cope with the successive technological revolutions regarding data recording (e.g., analogic to numeric; Fig.Magnetic observatory data are 'primary data' that are extensively used in the derivation of data products ('secondary data') such as: International Geomagnetic Reference Field models, geomagnetic indices, space weather applications…The whole community of geomagnetic observatories is particularly well organized and federated under the auspices of the International Association of Geomagnetism and Aeronomy (IAGA) one of the associations of the International Union of Geodesy and Geophysics [WDS Partner Member].This decision has been taken in order to avoid clashes with the UN World Data Forum (22–24 October) and the Plenary Meeting of the Group on Earth Observations (31 Oct–1 Nov).

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