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NOTE: The Boulder K-index is the real-time proxy for the Planetary K (Kp) values that define the Geomagnetic Storm (G-scale) on the NOAA Space Weather Scales. Kp is not available in real time and is usually delayed by approximately 30 minutes. To enable the fastest possible alerts of Geomagnetic Storm activity, the Boulder K-index is used as a substitute, 1 minute behind real time. Kp and the Boulder K-index will generally show the same overall trend of activity. However, differences in the absolute magnitude of these indices can result in differences in the G-level (or K-index) reached. These differences are generally restricted to plus or minus one G or K-level, although larger deviations are infrequently observed. Through partnership with the US Geological Survey, SWPC is working to eliminate the need for a Planetary K proxy by deriving an estimated Planetary K in real time. Real-time derivation of the Planetary K is anticipated by October 1, 2011. Products that currently use the Boulder K as a proxy will be transitioned to Planetary K at that time.