The Estimated 3-hour Planetary Kp-index is derived at the NOAA Space Weather Prediction Center using data from the following ground-based magnetometers: Boulder, Colorado; Chambon la Foret, France; Fredericksburg, Virginia; Fresno, California; Hartland, UK; Newport, Washington; Sitka, Alaska; Jeju, Korea. These data are made available thanks to the cooperative efforts between SWPC and data providers around the world, which currently includes the U.S. Geological Survey, the British Geological Survey, the Institut de Physique du Globe de Paris, and the Korean Space Weather Center.
Development and negotiations are in progress to add Canberra, Australia (Geoscience Australia); Ottawa and Meanook, Canada (Natural Resources Canada (NRCAN)); Niemegk and Wingst, Germany (German Research Centre for Geosciences - GFZ).
Other SWPC Real-time Monitors
Kp-indices of 5 or greater indicate storm-level geomagnetic activity. Geomagnetic storms have been associated with satellite surface charging and increased atmospheric drag.
For more information see The K-index or SWPC Education page.
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