British Geological Survey. 2018 Jim Carrigan Observatory Monthly Magnetic Bulletin: August 2018. British Geological Survey, 28pp. (Monthly Magnetic Bulletin Series: 18/08/JC) (Unpublished)
This bulletin contains the monthly preliminary observatory results, published to meet the needs of all users of geomagnetic data. Magnetic observatory data are presented as a series of plots of one-minute, hourly and daily values, followed by a table of monthly values. The operation of the observatory and presentation of data are described in the introduction.
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