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Real-time Monitoring of the Earth's Magnetic Field

Real-time Monitoring of the Earth's Magnetic Field

This site provides access to near real-time data on the Earth's magnetic field available at 14 United States Geological Survey (USGS) observatories across the world. The data includes fluxgate sensor measurements (H, D, Z, or intensity and declination) specifications and proton magnetometer data (F, or strength), and are available with a 12-24 minute delay. The data are 'preliminary' in nature, meaning that they have not been processed to adjust for long-term baseline drift, and they have not been cleaned of occasional spikes and step offsets. Data can be obtained for each station by following the provided links or by clicking on stations marked on a world map. Each station page shows the current data as an image file, and the last seven days of preliminary data are also available. Older data are available on CD by request. The site also includes descriptions of geomagnetism and animations that show changes in Earth�s magnetic fields (intensity, declination, and inclination) and the location of the magnetic poles over time.

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