Solar activity was moderate. A M1 class flare occurred at 12/0444 UT. SOHO/EIT imagery suggests this flare originated from Region 9608 (S26W18). Regions 9608 (S26W18) and 9610 (S13W05) have become more compact and increased in sunspot number. Numerous C-class flares also occurred. New data from SOHO/LASCO, together with H-alpha imagery, revealed a disappearing filament and associated halo CME which occurred on September 11 near spotless Region 9615 (N11E23). This event was also accompanied with a modest long duration optical and x-ray enhancements during 11/1416-1530 UT. New Region 9617 (N10E71) was numbered today.

Solar activity is expected to be moderate to high. Regions 9608 (S26W18), 9610 (S13E05), and 9616 (S11E69) are all potential sources of significant flares. Region 9608 is the most complex and capable of a major flare.

Geomagnetic activity was at quiet to active levels. High speed stream effects appear to be diminishing.

The geomagnetic field is expected to range from quiet to active with isolated minor storm conditions possible through days one and two, in response to the disappearing filament activity noted in section 1A above, along with the remaining possibility of some effect from the CME activity of September 9. By day three, predominantly quiet to unsettled conditions are expected.

  觀測的       12 Sep 235
  預測的   13 Sep-15 Sep  235/235/225
  90天平均值        12 Sep 164

  觀測的 Afr/Ap 11 Sep  012/009
  估算值     Afr/Ap 12 Sep  014/015
  預測的    Afr/Ap 13 Sep-15 Sep  015/015-018/020-012/012