K index (space weather)

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K index (space weather)

A space weather–related term for the 3-hourly quasi-logarithmic local index of geomagnetic activity relative to an assumed quiet-day curve for the recording magnetometer site. The range is from 0 (quiet) to 9 (extremely disturbed). This index measures the deviation of the most disturbed geomagnetic component. The individual K indices are combined to make the planetary K, or Kp index.

GFZ German Research Centre for Geosciences, 2018: Indices of global geomagnetic activity. Accessed 14 August 2018. Available at https://www.gfz-potsdam.de/en/kp-index/.

Space Weather Prediction Center, 2018: Station K and A indices. Accessed 14 August 2018. Available at https://www.swpc.noaa.gov/products/station-k-and-indices.

Term edited 14 August 2018.

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