| During the last week, solar activity was extremely high on 1 Feb, high on 2-5 Feb and low for the rest of the time. Fifteen active sunspot regions (AR4349, AR4357-AR4360, AR4362-AR4363, AR4365-AR4372) were on the visible disk with 6 X-class and 61 M-Class flares produced. No solar proton event occured. The F10.7 index ranged from 128 sfu to 178 sfu. Due to the continuous effect of the recurrent coronal hole high speed stream, the geomagnetic field reached active levels for 3 hours on 30 Jan. Due to the arrival of the CME which associated with X8.1 flare on 2 Feb, the solar wind speed reached a peak value of 610 km/s, and the geomagnetic field reached minor storm levels for 6 hours and active levels for 9 hours on 4-5 Feb. The geomagnetic field was quiet to unsettled on the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit maintained at minor storm levels during 30 Jan - 4 Feb. |