Solar activity remained at moderate levels. Region 44 (S21W24) produced four M-class flares during the period: an M2 at 28/2312 UTC, an M1 at 29/0023 UTC, an M4/1f at 29/0238 UTC associated with a 380 sfu Tenflare and a Type II radio sweep, and a long-duration M4 at 29/1044 UTC. The M4 flare at 29/1044 UTC may have been associated with a partial-halo CME. Region 44 showed a slight increase in sunspot area in its trailer portion. However, the region simplified slightly as the delta magnetic configuration within its intermediate spots showed signs of decay. Region 39 (S11W18) produced isolated C-class flares during the period. It remained large and magnetically complex with delta magnetic configurations within its leading and trailing spots, though the trailing delta may be decaying. Region 43 (N12W26) remained in a gradual growth phase and produced a C5/Sf flare late in the period. Region 50 (S07W06) produced a C8/Sf flare at 29/1941 UTC as it continued to increase in area and complexity. A magnetic delta may have formed within its intermediate spots. New Region 55 (N14E75) was numbered.

Solar activity is expected to be at moderate to high levels. Regions 39 and 44 are expected to produce M-class flares. Either region could produce a major flare during the period. Region 50 could produce an isolated M-class flare during the period.

Geomagnetic field activity was at quiet to unsettled levels during the first half of the period. ACE solar wind data indicated a shock passage at L1 at 29/1241 UTC followed by a weak sudden impulse (SI) at Earth at 29/1330 UTC (9 nT, as measured by the Boulder USGS magnetometer). Field activity increased to unsettled to active levels following the SI.

Geomagnetic field activity is expected to be at unsettled to active levels on 30 July decreasing to quiet to unsettled levels on 31 July. Field activity is expected to increase to active levels on 01 August in response to today's long-duration M4 flare. There is a chance for a proton event during the period.

  觀測的       29 Jul 234
  預測的   30 Jul-01 Aug  235/230/230
  90天平均值        29 Jul 166

  觀測的 Afr/Ap 28 Jul  009/012
  估算值     Afr/Ap 29 Jul  013/015
  預測的    Afr/Ap 30 Jul-01 Aug  015/015-010/010-020/020