British Geological Survey. 2021 Sable Island Observatory Monthly Magnetic Bulletin: April 2021. British Geological Survey, 32pp. (Monthly Magnetic Bulletin Series: 21/04/SB) (Unpublished)
Abstract
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 tabulations of monthly values, geomagnetic activity indices and reports of rapid variations. The operation and presentation of data are described in the introduction.
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BGS Programmes 2020 > Multihazards & resilience
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