Solar activity was low. Region 9704 (S17W63) was the principle source of flare activity and produced numerous C-class flares, the largest being a C7/Sf at 24/0553 UTC. No new regions were numbered.

Solar activity is expected to be predominantly low to moderate. Region 9704 remains a potential source for an isolated major flare with associated proton enhancements, as it rotates through the geoeffective heliographic longitudes over the next two days.

Geomagnetic field activity ranged from quiet to severe storm levels. The onset of storm conditions began with two sudden impulse observations: 20nt at 24/0500 UTC, followed by 80nt at 24/0555 UTC. The shock passages enhanced the already high 10 MeV proton integral flux to a peak value of 18900 pfu at 24/0555 UTC. Severe storm conditions were evident in planetary K-index values during 24/0600-1800 UTC. This event is the likely result of interaction among up to three interplanetary shock propagations from separate CME events during 21-23 November, indicated by re-analysis of shock arrival model predictions with improved event velocity data. Results suggest that the CMEs may have merged into the single interplanetary shock that passed the earth today. The 10 MeV proton event and associated polar cap absorption remained in progress at the end of the period, however the 100 MeV proton event ended at 24/1200 UTC.

Geomagnetic field activity may persist with isolated active and minor storm conditions for the next 48 hours, in the wake of today's shock passage. Conditions are expected to return to quiet to unsettled conditions by day three. The 10 MeV proton event is expected to continue to wane over the next 24 hours.

  Observé       24 Nov 173
  Prévisionnel   25 Nov-27 Nov  170/170/175
  Moyenne des 90 derniers jours        24 Nov 218

  Observé Afr/Ap 23 Nov  011/012
  Estimé     Afr/Ap 24 Nov  095/105
  Prévisionnel    Afr/Ap 25 Nov-27 Nov  030/030-018/020-012/010