Solar activity decreased to low levels today. Several minor B and C-class flares were observed during the period. Even though Region 397 (N12, L=028) has rotated beyond the west limb it managed to produce most of the recorded C-class activity. Region 401 (S09W05) produced the largest flare of the period, a C2.9 that occurred at 11/0739Z. This region has doubled in penumbral coverage during the interval although it remains simply structured. Region 400 (N06W65) was quiescent while undergoing steady decay. The magnetic gamma structure remains vaguely intact. Regions 405 (S10E66), 406 (S19W11), and 407 (N09E31) were newly assigned today.

Solar activity is expected to be at low levels. With continued growth, Region 401 may become capable of producing isolated M-class flares.

The geomagnetic field was at quiet to major storm levels. An extended period of southward Bz (-10 nT) led to the elevated conditions. An isolated period of major storm levels was observed between 11/0600 and 11/0900Z. An increase in the solar wind speed began near mid-period and is likely to be the onset of a recurrent coronal hole.

The geomagnetic field is expected to be at predominantly unsettled to active levels. Isolated minor storm conditions may occur at both middle and high latitudes, especially during nighttime hours due to high speed coronal hole stream effects throughout the period. Day three may see further elevated conditions due to an anticipated transient passage from the M3.6 x-ray flare that occurred on 10 July.

  觀測的       11 Jul 122
  預測的   12 Jul-14 Jul  115/110/120
  90天平均值        11 Jul 125

  觀測的 Afr/Ap 10 Jul  006/008
  估算值     Afr/Ap 11 Jul  023/035
  預測的    Afr/Ap 12 Jul-14 Jul  015/020-015/020-030/045