Solar activity was moderate. Region 691 (N13W55) produced today's only M-class flare: an M1/1f at 0322 UTC. The event was associated with a type II sweep and a relatively slow CME off the west limb (plane-of-sky speed ~ 500-550 km/s). Region 691 showed steady decay during the past 24 hours. The most spectacular event of the period was a bright CME from a source behind the west limb, which was first observed in the LASCO C2 coronagraph at 0606 UTC. The absence of disk signatures and observations in EIT 195 imagery clearly indicate a backside source. The plane-of-sky speed of the CME was about 800 km/s. Region 693 (S16E08) grew considerably during the period and is the dominant region on the disk. Although the group shows occasional brightenings it still has not produced any flare activity. New Region 696 (N09E63) was assigned today as a small, D-type group.

Solar activity is expected to be moderate, but there is a continued slight chance for major flares or proton producing flares from 691 or 693.

The geomagnetic field was quiet to unsettled during the past 24 hours. The arrival of transient flow from the solar events of 30 October has not yet been observed in the solar wind data. Proton events at greater than 10 MeV and greater than 100 MeV were observed. The 10 MeV event began at 0655 UTC, reached a maximum of 63 PFU at 0805 UTC, and appears to have ended as of 1900 UTC. The 100 MeV event began at 0635 UTC, reached a maximum of 1.5 PFU at 0645 UTC, and ended at 0755 UTC. The event was well associated with the backside CME reported in part IA.

The geomagnetic field is expected to be predominantly active for the next 24 hours (02 November) as the impact from the solar events of 30 October is still expected. Conditions should decline to unsettled to slightly active for 03 November, and should be predominantly unsettled by 04 November.

  觀測的       01 Nov 136
  預測的   02 Nov-04 Nov  135/135/130
  90天平均值        01 Nov 107

  觀測的 Afr/Ap 31 Oct  007/010
  估算值     Afr/Ap 01 Nov  012/015
  預測的    Afr/Ap 02 Nov-04 Nov  020/025-015/015-010/010