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This plot contains the estimated 3-hour Planetary K-Index.
K-indices of 5 or greater indicate storm-level geomagnetic activity around earth.
Below is the 15 minute Costello Geomagnetic Activity Index model. Click HERE for more information.
K-Index Definition
The K-index is a code that is related to the maximum fluctuations of horizontal components observed on a magnetometer relative to a quiet day, during a three-hour interval. The conversion table from maximum fluctuation (nT) to K-index, varies from observatory to observatory in such a way that the historical rate of occurrence of certain levels of K are about the same at all observatories. In practice this means that observatories at higher geomagnetic latitude require higher levels of fluctuation for a given K-index.
More information and conversion table. http://sec.noaa.gov/info/Kindex.html
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