SIDC URSIGRAM 30120 SIDC SOLAR BULLETIN 20 Jan 2003, 1230UT SIDC FORECAST (valid from 1230UT, 20 Jan 2003 until 22 Jan 2003) SOLAR FLARES : Eruptive (C-class flares expected, probability >= 50%) GEOMAGNETISM : Active conditions expected (A>=20 or K=4) SOLAR PROTONS : Quiet PREDICTIONS FOR 20 Jan 2003 10CM FLUX: 126 / AP: 023 PREDICTIONS FOR 21 Jan 2003 10CM FLUX: 122 / AP: 018 PREDICTIONS FOR 22 Jan 2003 10CM FLUX: 119 / AP: 018 COMMENT: North - south interplanetary magnetic field component Bz is oscillating as the Earth is now inside the fast flow from a coronal hole in the southern hemisphere of the Sun. Probably, the geomagnetic conditions will be disturbed during next few days as another coronal hole is approaching the central meridian of the Sun. SOLAR INDICES FOR 19 Jan 2003 SUNSPOT INDEX : 123 10CM SOLAR FLUX : 130 AK CHAMBON LA FORET : 033 AK WINGST : /// ESTIMATED AP : 022 NOTICEABLE EVENTS SUMMARY DAY BEGIN MAX END LOC XRAY OP 10CM TYPE Catania NOAA NOTE NONE END BT