| During the last week, solar activity was moderate on 26 Mar, and low on other time. 8 active sunspot regions (AR4392, AR4397-AR4403) were on the visible disk with 1 M-class flare produced. No solar proton event occurred. The F10.7 index increased from 102 sfu to 152 sfu. Due to the effects of the CMEs on 16, 18 and a recurrent coronal hole high speed stream, the solar wind speed reached a peak value of about 530 km/s and the geomagnetic field reached major storm levles for 6 hours, moderate storm levels for 6 hours, minor storm levels for 3 hours, and active levels for 12 hours on 20-21 Mar. Due to the effect of the coronal hole high speed stream, the solar wind speed reached a peak value of about 760 km/s and the geomagnetic field reached major storm levles for 6 hours, moderate storm levels for 9 hours, minor storm levels for 15 hours, and active levels for 18 hours on 22-24 Mar. Due to the effect of the CME on 22, the geomagnetic field reached minor storm levels for 3 hours, and active levels for 3 hours on 25 Mar. The geomagnetic field was quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit was at minor storm levels on 23-26 Mar. |
