| During the last week, solar activity was low to high with high levels on 18 Jan, moderate levels on 17 Jan and 19-21 Jan, low for the rest of time. Sixteen active sunspot regions (AR4336, AR4340-AR4354) were on the visible disk with one X-class flare and 5 M-class flares produced. The greater than 10 MeV proton flux at geosynchronous orbit reached the level of solar proton event at 10:55 on 18 Jan. It reached moderate solar proton event level at 04:40 on 19 Jan and increased to major solar proton event level at 10:40 on 19 Jan, with the maximum proton flux reaching 36976 pfu. This event ended at 05:45 on 22 Jan. The F10.7 index ranged between 148 sfu and 194 sfu. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 750 km/s and the geomagnetic field was at minor storm levels for 15 hours and at active levels for 30 hours on 16-18 Jan. Due to the effects of the CME on 18 Jan, the solar wind speed reached a peak value of 1100 km/s, and the geomagnetic field reached severe storm levels for 3 hours, major storm levels for 30 hours, moderate storm levels for 9 hours, and active levels for 6 hours on 19-21. The geomagnetic field reached minor storm for 3 hours and active levels for 3 hours on 22 Jan. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 16, 18-19, and 22 Jan. |
