:Product: 20030517SGAS.txt :Issued: 2003 May 17 0245 UTC # Prepared jointly by the U.S. Dept. of Commerce, NOAA, # Space Environment Center and the U.S. Air Force. # Joint USAF/NOAA Solar and Geophysical Activity Summary SGAS Number 137 Issued at 0245Z on 17 May 2003 This report is compiled from data received at SWO on 16 May A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep None B. Proton Events: None. C. Geomagnetic Activity Summary: The geomagnetic field was at unsettled level. Solar wind velocity continues to decrease as the previous coronal hole rotates across the west limb. The greater than 2 MeV electron flux was at high levels today. D. Stratwarm: None. E. Daily Indices: (real-time preliminary/estimated values) 10 cm 103 SSN 097 Afr/Ap 009/009 X-ray Background B1.5 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 7.7e+05 GT 10 MeV 1.1e+04 p/(cm2-ster-day) (GOES-8 satellite synchronous orbit W92 degrees) Daily Electron Fluence GT 2 MeV 4.50e+08 e/(cm2-ster-day) (GOES-12 satellite synchronous orbit W75 degrees) 3 Hour K-indices: Boulder 3 2 2 2 2 3 2 2 Planetary 3 2 2 2 2 2 3 3 F. Comments: The GOES 10 energetic proton detectors are showing intermittent, high noise levels in the higher energy proton channels (greater than about 80 MeV). This problem was first noticed in data taken April 26, 2003. To ensure continued operational monitoring of important energetic particle data, it is necessary to reassign primary/secondary designations for the GOES Space Environment Monitor (SEM) detectors. As of 1500 UT on May 15, GOES-8 became the primary satellite for protons. GOES 12 will be the primary satellite for magnetometer, X-ray, and electron measurements. GOES 10 will be the secondary satellite for all SEM sensors - magnetometer, X-ray sensor, and energetic particle sensor. This short-term solution (approximately 2 - 3 months) will be in place until we define and implement a permanent fix. A more detailed explanation can be found at: http://www.sec.noaa.gov/GOES.html.