SIDC – L’attività solare si mantiene ad alti livelli. Due splendide macchie sono attualmente visibili a occhio nudo, e all’origine di potenti flares: “PRESTO FROM SIDC – RWC BELGIUM Sat Oct 25 2003, 1330 UT – Yesterday morning a CME escaped from the East (+/- S18E88).

It is first seen in LASCO C2 images at 03:06 UT and seems to evolve into a partial halo CME. It could be related to the M7.6 flare from NOAA 0486 (Catania 70) peaking at 02:53 UT and become geoeffective on 26 Oct early UT. At present, geomagnetic conditions are quiet (NOAA Kp=3). The solar wind speed is nearly 650 km/s and from 13:00 UT Bz switched mildly southward. This means active to minor storm conditions could be expected. Solar activity remains at very high levels in both sunspot groups NOAA 0484 and 0486 (Catania resp. 65, 70). They are likely to produce more strong flares (M and possibly X). A new bipolar sunspot group is upcoming (Catania 73).”