Solar activity has been moderate. Region 652 (N08W10) produced a C1.0 flare at 23/1609 UTC, which would not be noteworthy except that a full-halo CME was observed on LASCO imagery at the same time, as well as a Type II radio sweep with a speed of 710 km/s. Analysis of SXI and EIT imagery indicate that the flare and CME are probably associated. Region 652 also produced three M-class flares over the period, the largest an M2.2/Sf at 23/1728 UTC. A CME with a plane-of-sky speed of 700 km/s associated with this flare was observed on LASCO imagery. Region 652 maintains its large size and magnetic complexity. No new regions were numbered today.

Solar activity is expected to be moderate to high. Region 652 may still produce major flares.

The geomagnetic field has been at active to major storm levels from the continued effects of CME transient activity. After maintaining a mostly southward orientation for over 24 hours, Bz rotated northward at 1600 UTC. ACE solar wind speed has steadily declined to 500 km/s. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels today.

The geomagnetic field is expected to be quiet to active tomorrow (24 July) as the current activity subsides. A CME observed on 22 July may produce active and isolated minor storm conditions on 24 July. Activity should decrease to unsettled levels on 25 July. CME activity associated with today's C1 and M2 flares will likely impact Earth's geomagnetic field on 26 July, with active to minor storm conditions possible.

  觀測的       23 Jul 165
  預測的   24 Jul-26 Jul  160/160/150
  90天平均值        23 Jul 104

  觀測的 Afr/Ap 22 Jul  013/019
  估算值     Afr/Ap 23 Jul  040/050
  預測的    Afr/Ap 24 Jul-26 Jul  020/025-015/015-025/025