Official Space Weather Advisory issued by NOAA Space Weather Prediction Center Boulder, Colorado, USA SPACE WEATHER ADVISORY OUTLOOK #14-51 2014 December 21 at 6:05 p.m. MST (2014 December 22 0105 UTC) **** SPACE WEATHER OUTLOOK **** Summary For December 15-21 An R3 (Strong) radio blackout was observed on December 20. R2 (Moderate) radio blackouts were observed on December 17 and 18. R1 (Minor) blackouts were observed on December 17, 19 and 21. No G1 (Minor) or greater geomagnetic storms were observed. No S1 (Minor) or greater space radiation storms were observed, although the greater than 10 MeV flux at geosynchronous orbit was enhanced, reaching a peak flux of 3.24 pfu on December 21. Outlook For December 22-28 R1-R2 (Minor to Moderate) radio blackouts are expected through December 28. There is a chance for an R3 (Strong) or greater radio blackout through December 26. There is a chance for a G1 (Minor) geomagnetic storm on December 22. There is a chance for an S1 (Minor) or greater space radiation storm through December 28th. Data used to provide space weather services are contributed by NOAA, USAF, NASA, NSF, USGS, the International Space Environment Services and other observatories, universities, and institutions. More information is available at SWPC's Web site http://swpc.noaa.gov Thank you for using the Product Subscription Service. If you would like to remove a product subscription or update the personal information in your account, go to the Product Subscription Site. Please do not use the from address for correspondence, as it is not monitored. For comments or help, please contact SWPC Help.