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Information about K-indices

K-indices from the UK observatories:

1868-90 Hand Scaled

1991-> Automatically Scaled

Please note that the K-indices from Abinger observatory currently online are the values re-scaled by Mayaud in the 1960s and not the values originally scaled by observatory staff.

The K-indices are available from:

You can also see a chart of real-time K from the three UK observatories and Kp.

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Month : (e.g. 6 for June) Year : (from 1868 to present)

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