SIDC URSIGRAM 30807 SIDC SOLAR BULLETIN 07 Aug 2003, 1400UT SIDC FORECAST (valid from 1230UT, 07 Aug 2003 until 09 Aug 2003) SOLAR FLARES : Eruptive (C-class flares expected, probability >= 50%) GEOMAGNETISM : Quiet (A<20 and K<4) SOLAR PROTONS : Quiet PREDICTIONS FOR 07 Aug 2003 10CM FLUX: 133 / AP: 008 PREDICTIONS FOR 08 Aug 2003 10CM FLUX: 134 / AP: 007 PREDICTIONS FOR 09 Aug 2003 10CM FLUX: 134 / AP: 007 COMMENT: The influence of the small equatorial coronal hole is already subsiding. The solar wind speed peaked near 550km/s. From 21:00 UT, Aug 6, onwards it decreased to approximately 500 km/s, and currently remains steady near that value. The interplanetary magnetic field is mainly pointing north. Geomagnetic conditions are quiet and are expected to remain like that in the following days. Solar activity has been low over the past day, with just a single C-flare from a region at the east limb. Catania sunspot groups 88 and 90 (NOAA 0425 and 0424) remain capable of generating C-flares, with a small chance for an M-flare, especially from group 90, which has developed a beta-gamma-delta magnetic configuration. SOLAR INDICES FOR 6 Aug 2003 SUNSPOT INDEX : 158 10CM SOLAR FLUX : 129 AK CHAMBON LA FORET : 029 AK WINGST : 024 ESTIMATED AP : 032 NOTICEABLE EVENTS SUMMARY DAY BEGIN MAX END LOC XRAY OP 10CM TYPE Catania NOAA NOTE NONE END BT