Solar activity was low. Isolated low-level C-class flares were observed. Plage Region 1396 (N25W86) produced a C1 x-ray flare at 20/2112Z associated with a Type II radio sweep (estimated shock velocity 945 km/s) and a non-Earth-directed coronal mass ejection (CME). Region 1402 (N29W11) produced a long-duration C1 at 20/2333Z associated with a weak Type IV radio sweep. Region 1402 showed gradual trailer spot decay during the period and was classified as a Cko group with a beta magnetic configuration. Region 1401 (N17W14) also showed gradual trailer spot decay and was classified as an Ehi group with a beta magnetic classification. New Regions 1408 (N08E69) and 1409 (N16E50) were numbered. Both were small and simply-structured.

Solar activity is expected to be low through the period (22 - 24 January) with a chance for an isolated M-class flare.

The geomagnetic field was at mostly quiet levels with brief active to minor storm levels at high latitudes. A weak interplanetary shock was observed at the ACE spacecraft at around 21/0400Z. This was followed by a weak geomagnetic sudden impulse at 21/0502Z (7 nT, Boulder USGS magnetometer).

The geomagnetic field is expected to be at mostly quiet levels until late on day 1 (22 January). Activity is forecast to increase to unsettled to active levels at around 22/1800Z and continue into day 2 (23 January) due to the expected arrival of the halo-CME observed on 19 January. There will also be a chance for minor storm levels during the CME passage. Field activity is expected to decrease to quiet to unsettled levels on day 3 (24 January) as CME effects subside.

  觀測的       21 Jan 142
  預測的   22 Jan-24 Jan  145/145/145
  90天平均值        21 Jan 143

  觀測的 Afr/Ap 20 Jan  003/004
  估算值     Afr/Ap 21 Jan  005/005
  預測的    Afr/Ap 22 Jan-24 Jan  009/010-020/025-007/008