:Product: 20030409SGAS.txt :Issued: 2003 Apr 09 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 099 Issued at 0245Z on 09 Apr 2003 This report is compiled from data received at SWO on 08 Apr A. Energetic Events Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0723 0724 0724 100 1329 1329 1329 110 B. Proton Events: None C. Geomagnetic Activity Summary: The geomagnetic field was at quiet to active levels. A CME shock from the M1 event on 04 April arrived early today with a 33 nT sudden impulse at 08/0115Z recorded on the Boulder magnetometer. Bz reached values near minus 10 nT and solar wind velocity reached peak values near 500 km/s. Unsettled to active levels were observed at mid latitudes and an isolated minor storm condition on the planetary index. D. Stratwarm: None E. Daily Indices: (real-time preliminary/estimated values) 10 cm 112 SSN 052 Afr/Ap 018/020 X-ray Background B1.9 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 6.0e+06 GT 10 MeV 2.2e+04 p/(cm2-ster-day) (GOES-10 satellite synchronous orbit W135 degrees) Daily Electron Fluence GT 2 MeV 1.40e+07 e/(cm2-ster-day) (GOES-10 satellite synchronous orbit W135 degrees) 3 Hour K-indices: Boulder 3 3 4 4 3 4 2 3 Planetary 2 3 4 5 4 4 2 3 F. Comments: Beginning 1500 UTC April 8, SEC will begin using data from the GOES 12 satellite, and stop receiving GOES 8 data. GOES 12 has the new Solar X-Ray Imager (SXI), which will acquire real-time, operational images of the solar x-ray flux. With the switch from GOES 8 to GOES 12, the primary/secondary designations will change. GOES 12 will be the primary satellite for the SXI. All other data, including magnetometer, XRS x-ray measurements, and energetic particles, will have GOES 10 as their primary source, with GOES 12 as the secondary source where available. Please see http://www.sec.noaa.gov/GOES.html for important information on this changeover.