Solar activity decreased to moderate levels today. Region 656 (S13W61) was limited to a single M-class flare during the period, an M1/Sf that occurred at 16/0347Z. A long duration C9/Sf event occurred at 16/1338Z which produced a very faint CME that does not appear to be Earth-directed. Region 656 underwent little change in spot area. The region remains a beta-gamma-delta magnetic complex although the delta structure in the intermediate spot cluster has weakened over the period. Region 661 (N07E34) was quiescent throughout the period but is worthy of note due to the small delta magnetic structure that has developed in the southern most part of the dominant trailing spot. A partial halo CME was observed mostly on the northwest solar limb which appears to be a backsided event. No new regions were numbered today.

Solar activity is expected to be at moderate to high levels through 17 and 18 August. Activity should begin to diminish on 19 August as Region 656 transits the western solar limb.

The geomagnetic field was at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels today.

The geomagnetic field is expected to be at quiet to unsettled levels. A slight chance for isolated active conditions throughout the period exists due to the weak CME activity seen during the past several days.

  Vaadeldud       16 Aug 134
  Prognoositud   17 Aug-19 Aug  130/125/115
  90 päeva keskmine        16 Aug 108

  Vaadeldud Afr/Ap 15 Aug  003/007
  Hinnanguline     Afr/Ap 16 Aug  003/008
  Prognoositud    Afr/Ap 17 Aug-19 Aug  008/008-008/008-005/008