SIDC URSIGRAM 31231 SIDC SOLAR BULLETIN 31 Dec 2003, 1230UT SIDC FORECAST (valid from 1230UT, 31 Dec 2003 until 02 Jan 2004) SOLAR FLARES : Quiet conditions (<50% probability of C-class flares) GEOMAGNETISM : Active conditions expected (A>=20 or K=4) SOLAR PROTONS : Quiet PREDICTIONS FOR 31 Dec 2003 10CM FLUX: 101 / AP: 016 PREDICTIONS FOR 01 Jan 2004 10CM FLUX: 101 / AP: 024 PREDICTIONS FOR 02 Jan 2004 10CM FLUX: 101 / AP: 024 COMMENT: Once again, it's a quiet-flare day. The by Izmiran measured geomagnetic indices are 2 and 3. Today, active geomagnetic conditions are possible as a consequence of a recursive coronal hole. A small jump in the solar wind speed is detected between 1100 and 1200UT: the speed jumped from 420 to 480 km/s according to ACE. SOLAR INDICES FOR 30 Dec 2003 SUNSPOT INDEX : 043 10CM SOLAR FLUX : 108 AK CHAMBON LA FORET : 011 AK WINGST : 009 ESTIMATED AP : 008 NOTICEABLE EVENTS SUMMARY DAY BEGIN MAX END LOC XRAY OP 10CM TYPE Catania NOAA NOTE NONE END BT