Solar activity was at moderate levels. Region 422 (N14W67) produced the largest flare of the period, an M2.5/1b flare that occurred at 30/0410Z. A Tenflare and several discrete radio bursts were associated with the event. There were no observed Type II radio sweeps and LASCO imagery doesn't depict a resulting CME. There appears to have been some decay in complexity to this region overnight and the gamma magnetic structure is no longer evident, although the majority of the flare activity came from this region during the period. Region 421 (S08E41) produced a single event today, a B9.1 x-ray flare that occurred at 30/1014Z. There was some penumbral loss in spot group and little flare production today, but the weak gamma magnetic structure remains intact. No new regions were numbered today.

Solar activity is expected to be at low to moderate levels. Regions 421 and 422 both have a chance of producing further isolated M-class flares.

The geomagnetic field was at unsettled to minor storm levels. A recurrent high speed coronal hole stream remains geoeffective. The greater than 2 MeV electron fluxes at geosynchronous orbit reached high levels again today.

The geomagnetic field is expected to be at predominantly active levels throughout the forecast period. Nighttime sectors may experience isolated minor storm conditions through the first two days of the interval. The high speed stream should be in the waning phase by the end of day three.

  Observé       30 Jul 099
  Prévisionnel   31 Jul-02 Aug  100/100/095
  Moyenne des 90 derniers jours        30 Jul 125

  Observé Afr/Ap 29 Jul  024/036
  Estimé     Afr/Ap 30 Jul  020/030
  Prévisionnel    Afr/Ap 31 Jul-02 Aug  020/025-015/020-015/020