SIDC URSIGRAM 30827 SIDC SOLAR BULLETIN 27 Aug 2003, 1200UT SIDC FORECAST (valid from 1230UT, 27 Aug 2003 until 29 Aug 2003) SOLAR FLARES : Eruptive (C-class flares expected, probability >= 50%) GEOMAGNETISM : Active conditions expected (A>=20 or K=4) SOLAR PROTONS : Quiet PREDICTIONS FOR 27 Aug 2003 10CM FLUX: 125 / AP: 017 PREDICTIONS FOR 28 Aug 2003 10CM FLUX: 129 / AP: 019 PREDICTIONS FOR 29 Aug 2003 10CM FLUX: 133 / AP: 019 COMMENT: Data from the ACE spacecraft show that the interplanetary magnetic field is constantly pointing southward at about Bz=-5. Combined with a solar wind speed of about 450 km/s, we expect that this will lead to intermittent active geomagnetic conditions the coming 24 hours. SOLAR INDICES FOR 26 Aug 2003 SUNSPOT INDEX : 141 10CM SOLAR FLUX : 121 AK CHAMBON LA FORET : 020 AK WINGST : 014 ESTIMATED AP : 016 NOTICEABLE EVENTS SUMMARY DAY BEGIN MAX END LOC XRAY OP 10CM TYPE Catania NOAA NOTE NONE END BT