Solar activity was low. Region 425 (S09W43) produced a C3/Sf flare at 10/1020Z followed by a more gradual C2 flare that peaked at 10/1128Z. Region 431 (S13E56) produced an impulsive C1/Sf flare at 10/0127Z. This beta gamma region is showing some minor complexity in a spot group with over 250 millionths of white light coverage. Region 424 (S18W41), the largest region on the visible disk, exhibited only minor plage fluctuations this period. Remaining active regions were quiet.

Solar activity is expected to continue at low levels. C-class flares are possible from Regions 424, 425, and 431.

The geomagnetic field was quiet to active. A declining high speed stream with very low density and weak northward IMF Bz continues to buffet the Earth's magnetic field. Solar wind speed declined from near 700 km/s to below 600 km/s by the end of the period. The greater than 2 MeV electrons at geosynchronous orbit reached high levels again today.

The geomagnetic field is expected to be mostly quiet to active on day one. Another coronal hole high speed stream is expected to impact the geomagnetic field on days two and three. Expect unsettled to minor storm levels both days with isolated major storm periods on day three.

  觀測的       10 Aug 131
  預測的   11 Aug-13 Aug  130/130/125
  90天平均值        10 Aug 125

  觀測的 Afr/Ap 09 Aug  010/015
  估算值     Afr/Ap 10 Aug  010/014
  預測的    Afr/Ap 11 Aug-13 Aug  012/012-020/020-020/035