Solar activity increased to low levels. Region 421 (S08E67) has shown significant growth over the period and has begun to produce B and C-class flares. A weak gamma magnetic structure has become evident in the central portion of the region. Newly numbered Region 422 (N14W41) appears to be a fully developed region (possibly the return of old Region 400) and has also produced B and C-class flares today. This region may have a fair degree of magnetic complexity, but it is currently too close to the east limb for a comprehensive analysis.

Solar activity is expected to be at low levels. Regions 421 and 422 may both have the potential to produce an isolated low level M-class flare.

The geomagnetic field was at quiet to minor storm levels. A recurrent high speed coronal hole stream is believed to be responsible for the elevated conditions. The greater than 2 MeV electron fluxes at geosynchronous orbit reached moderate levels today.

The geomagnetic field is expected to be at predominantly unsettled to active levels. Isolated minor storm conditions are expected throughout the interval due to high speed solar wind effects.

  觀測的       28 Jul 103
  預測的   29 Jul-31 Jul  110/115/120
  90天平均值        28 Jul 126

  觀測的 Afr/Ap 27 Jul  016/024
  估算值     Afr/Ap 28 Jul  018/020
  預測的    Afr/Ap 29 Jul-31 Jul  020/025-015/025-020/020