Solar activity was at low levels. Region 158 (S08E11) produced the largest flare of the period which was a C3.5/Sf that occurred at 17/1207 UTC. Penumbral growth was seen in the trailing cluster of spots in this northeast-southwest orientated spot complex. A weak gamma magnetic structure also became evident today. Several lesser C-class flares were also attributed to this region. Region 149 (N14W33) showed slight decay and produced a single optically correlated long duration event, flare maximum reached C3.0/Sf at 17/1805 UTC. Weak magnetic gamma structure seen yesterday is no longer apparent. New region 162 (N25E76) was assigned today.

Solar activity is expected to be at low levels. Region 149 and 158 are capable of producing low level M-class flare activity.

The geomagnetic field activity was at quiet to active levels. An isolated active period occurred between 17/0000-0300 UTC at high latitudes.

The geomagnetic field activity is expected to be predominantly quiet to unsettled. Active conditions are possible on day one due to elevated solar wind speed. Day three may see active conditions in response to a relatively small, yet favorably positioned coronal hole.

  觀測的       17 Oct 179
  預測的   18 Oct-20 Oct  185/185/180
  90天平均值        17 Oct 182

  觀測的 Afr/Ap 16 Oct  009/014
  估算值     Afr/Ap 17 Oct  010/015
  預測的    Afr/Ap 18 Oct-20 Oct  010/015-008/012-010/015