GFZ Geomagnetic Kp Index
GFZ Geomagnetic Kp Index
GFZ Helmholtz Centre for Geosciences publishes the three-hourly planetary Kp geomagnetic index and derived indices (ap, Ap, Cp, C9, Hp30, Hp60), definitive and nowcast, through a keyless JSON web service and ASCII files. GFZ produces the definitive Kp series; NOAA SWPC publishes its own estimated planetary K.
Required Attribution:
Required: "Please refer to GFZ German Research Centre for Geosciences as data source."
Coverage
Global geomagnetic activity. The data page lists "Kp and ap since 1932, daily updated".
Verdict
Keyless JSON web service and ASCII files from GFZ. Licensed CC-BY-4.0: "GFZ provides Kp and its derived indices and the figures on this website with the Creative Commons Attribution 4.0 International (CC BY 4.0) license." and "Please refer to GFZ German Research Centre for Geosciences as data source." Rate limits: Not stated. Signal Lab links only.
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