Solar activity was low. Newly numbered Region 1338 (S12E69) produced the largest flare of the period; a C5 flare at 31/2322Z. Another new region, responsible for M-class flare activity on 31 October, is currently rotating into view on the Northeast limb and was numbered Region 1339 (N22E71). A CME was observed in SOHO/LASCO C2 imagery at 31/1700Z with the majority of the ejecta off the Northeast limb. The CME was associated with a disappearing solar filament (DSF) that was observed in SDO/AIA 193 imagery at 31/1426Z. STEREO B COR 2 imagery had a plane of sky speed of approximately 503 km/s. A glancing blow from this CME is possible early on 04 November.

Solar activity is expected to be low to moderate. Further M-class flares are likely from new Region 1339.

The geomagnetic field ranged from quiet to minor storm levels with major and severe storm periods observed at high latitudes. At approximately 01/0817Z, a shock arrival was observed at the ACE spacecraft. Solar wind speed increased from approximately 370 km/s to 420 km/s while the total magnetic field (IMF Bt) increased from 5 to 15 nT. A sudden impulse (SI) of 18 nT was observed on the Boulder magnetometer at 01/0907Z. This event was possibly due to transient activity associated with a DSF on 28 October.

The geomagnetic field is expected to be quiet to unsettled with isolated active periods possible on day 1 (02 November) due to continued activity from transient activity on 01 November. Mostly quiet conditions are expected on days 2 - 3 (03 - 04 November).

  觀測的       01 Nov 139
  預測的   02 Nov-04 Nov  145/145/150
  90天平均值        01 Nov 125

  觀測的 Afr/Ap 31 Oct  009/008
  估算值     Afr/Ap 01 Nov  015/027
  預測的    Afr/Ap 02 Nov-04 Nov  008/010-005/005-005/005