Solar activity was moderate. Region 9825 (N13W90) continued to be the region of primary concern as it rotated around the NW limb. The three M-class flares this period all appear to have originated from this region. The largest was an M3 at 21/1226Z. A prominence erupted from this area at 21/0608Z, followed by a large filament eruption at around 21/1100Z. Region 9335 (S09W75) grew rather quickly this period and produced some small flares as it approaches the west limb. New Regions 9838 (N05W18), 9839 (S16E06), and 9840 (S12E72), were numbered today.

Solar activity is expected to continue at moderate to high levels. We may continue to experience activity from behind the NW limb for the next day or so. Region 9835 has potential to produce M-class activity with a small chance for a major flare.

The geomagnetic field was quiet to unsettled. The greater than 10 MeV protons at geosynchronous orbit remain elevated following the small proton event that began and ended between 20/0730 - 0800Z.

The geomagnetic field is expected to continue at quiet to unsettled levels through day one. Active conditions are expected on day two due to an expected CME passage associated with the M5/1n flare that occurred on 20/0612Z. Quiet to unsettled conditions are expected to return by day three.

  觀測的       21 Feb 201
  預測的   22 Feb-24 Feb  205/200/200
  90天平均值        21 Feb 223

  觀測的 Afr/Ap 20 Feb  006/008
  估算值     Afr/Ap 21 Feb  008/008
  預測的    Afr/Ap 22 Feb-24 Feb  010/015-015/020-010/010