British Geological Survey. 2009 Hartland Observatory Monthly Magnetic Bulletin : March 2009. British Geological Survey, 32pp. (Monthly Magnetic Bulletin Series: 09/03/HA)
Abstract
This bulletin is published to meet the needs of both commercial and academic 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, indices and reports of rapid variations. The operation of the observatory and presentation of data are described in the introduction.
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