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Did you know? Here’s a space weather and radio propagation educational tidbit – from http://SunSpotWatch.com – at 14:00 UTC on 2017-06-20:
It’s useful to quantify the degree of magnetic disturbance observed each day over regions of Earth, or globally. The two most-popular indices presently used to measure levels of geomagnetic activity are known as the ‘A’ and 'K’ indices.
The Geomagnetic K-Index is a value ranging from 0 to 9. This value indicates the magnitude of irregular variations occurring with the Earth’s geomagnetic field. The K-index is measured over a period of three (3) hours, using Universal Time Coordinate (UTC) time. Every three hours, the K-index is reported, typically as the 'planetary K index’, or, Kp. The locations at which measurements are made each report their K index, every three hours. All of these, at each three-hour interval, are averaged together, and reported as the Kp value for that three-hour interval.
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