Solar activity was at low levels. The largest flare was a C2 event observed at 17/1810Z from Region 1615 (N08W21), a simple Bxo group with beta magnetic characteristics. Region 1613 (S24W19) remained the most magnetically complex (beta-gamma) of the nine spotted regions on the visible disk, while Region 1614 (N15W07) remained the largest at 160 millionths. The general downward trend in active region complexity and size continued today

Solar activity is expected to be at low levels with a slight chance for moderate activity through the period (18-20 Nov).

The geomagnetic field was at quiet to unsettled levels. Solar wind measured at the ACE spacecraft began fluctuating between positive and negative sectors around 17/0655Z, enventually settling into the positive sector after 17/1800Z. About an hour after the fluctuations began, wind speed began rising from 390 km/s and reached a peak speed of 453 km/s at 17/1444Z. Total IMF reached 6.2 nT at 17/0746Z. The maximum southward component of Bz reached -4.7 nT at 17/0345Z. These observations were consistent with the arrival of a weak positive coronal hole high speed stream. The greater than 2 MeV electron flux at geosynchronous orbit reached 3160 pfu.

The geomagnetic field is expected to be at mostly quiet levels with isolated unsettled periods possible for the next three days (18-20 Nov).

  觀測的       17 Nov 135
  預測的   18 Nov-20 Nov 135/135/135
  90天平均值        17 Nov 120

  觀測的 Afr/Ap 16 Nov  005/005
  估算值     Afr/Ap 17 Nov  006/008
  預測的    Afr/Ap 18 Nov-20 Nov  007/008-006/005-006/005