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- W1823294086 abstract "Rapidly changing geomagnetic field variations constitute a naturalhazard, for example in navigation and, through geomagnetically inducedcurrents, to power grids and pipeline networks. To understand thishazard we have continuous magnetic measurements across the worldfor typically less than 100 years. Much of the older data is also inanalogue form, or is only available digitally as hourly or daily magneticindices or mean levels. So it may not yet be clear what the trueextremes in geomagnetic variations are, particularly on time scales -seconds to minutes - that are relevant for estimating the hazard totechnological systems.We therefore use a number of decades of one minute samples ofmagnetic data from observatories across Europe, together with thetechnique of 'extreme value statistics’ to explore estimated maxima infield variations in the horizontal strength and in the declination of thefield. These maxima are expressed in terms of the variations that mightbe observed once every 100 and 200 years. We also examine theextremes in one-minute rates of change of these field components oversimilar time scales.The results should find application in both hazard assessment fortechnologies and in navigation applications. The results can also beused to more rigorously answer the often-asked question: “just howlarge can geomagnetic storms and field variations be?”" @default.
- W1823294086 created "2016-06-24" @default.
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- W1823294086 date "2009-11-13" @default.
- W1823294086 modified "2023-09-26" @default.
- W1823294086 title "Estimating the extremes in European geomagnetic activity" @default.
- W1823294086 hasPublicationYear "2009" @default.
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