Solar activity was low. There were two C-class flares observed during the past 24 hours, a C1 at 24/2337 UTC from Region 436 (N07W39) and a C3/1f at 0259 UTC from Region 442 (S13E30). The C3 flare was long duration and was associated with an erupting prominence (located near S09E38). The event was followed by an associated coronal mass ejection which was observed off the southeast limb in C3 coronagraph data. New Region 445 (N04E38) was assigned today.

Solar activity is expected to be predominantly low for the next three days. There is a slight chance for an isolated M-class flare.

The geomagnetic field ranged from unsettled to minor storm levels. Today's activity was initially at active levels in response to a high speed solar wind stream. Activity increased to minor storm levels from 0600-0900 UTC, but then backed off to mostly unsettled levels from 0900 through the end of the day. The greater than 2 MeV electron flux was at high levels during the past 24 hours.

The geomagnetic field is expected to be unsettled with occasional active periods during the next two days as the current disturbance persists. A decline to mostly unsettled is expected on the third day.

  觀測的       25 Aug 117
  預測的   26 Aug-28 Aug  120/120/125
  90天平均值        25 Aug 127

  觀測的 Afr/Ap 24 Aug  014/024
  估算值     Afr/Ap 25 Aug  020/023
  預測的    Afr/Ap 26 Aug-28 Aug  015/015-015/012-012/012