Space Weather Prediction Center Special Announcement

As announced on our website, effective November 16, 2011, the Space Weather Prediction Center (SWPC) will be making numerous changes to its geomagnetic product suite. SWPC’s nowcast and forecast products, alerts, watches, and warnings will transition to be based on an estimate or prediction of the Planetary indices Kp and Ap. Currently all of these products are based off of the K-index computed from the Boulder magnetometer and the A-index from Fredericksburg, Virginia. The impact of the change should be minimal and no changes to product subscriptions will be required.

For more details on the change, please see the customer announcement on our website at: http://www.swpc.noaa.gov/geomag/geomag.html