Geomagnetic Observatory 2.5 Minute Data

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Geomagnetic variation data with 2.5 minute resolution

Geomagnetic Observatory One Minute Data

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Unknown

Geomagnetic Observatory 10 Second Data

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Geomagnetic 10 second data provides high temporal resolution of geomagnetic variations

Geomagnetic Observatory Hourlyl Data

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Geomagnetic Hourly Averages from world wide observatories

Intermagnet definitive observatory data

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1 minute and hourly values reported as definitive from Intermagnet observatories.

A Report on Geomagnetic Observatories, 1995

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Report on the status of world wide geomagnetic observatories

Anuarios de Geomagnetismo - AÑO 2002

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Yearbook for Italian Geomagnetic Observatories

Geomagnetic Indices Bulletin (GIB)

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The Geomagnetic Indices Bulletin is a one page sheet containing the magnetic indices Kp, Ap, Cp, An, As, Am and the provisional aa indices. The bulletin is published monthly.

AM Index

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Geomagnetic Range index using data from multiple observatories - Mayaud 1948

Values for the 15-minute Index of Geomagnetic Activity at High Latitude Stations (Geomagnetic Latitude 58 Degrees)

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The NOAA National Centers for Environmental Information (formerly National Geophysical Data Center) receives, on a monthly basis, Q indices from Sodankyla. These data are available from July 1957 to the present. Sodankyla indices are the most complete records of Q indices that NCEI has. The archive also contains Q indices from 15 other observatories. The Q index is a measure of geomagnetic activity assigned by high latitude (geomagnetic latitude > 58 degrees) geomagnetic observatories for each 15 minute interval. The index is designed to study auroral and ionospheric phenomena over a time scale smaller than that possible with KP. The Q scale is loosely logarithmic, with possible values from 0 to 11.