The Sun is entering its minimum activity phase. In the past week, there was no flare nor filament eruption occurred and there were only simple small-size active regions (NOAA 2691) observed on the solar disk. SOHO/LASCO did not observe any coronal mass ejection with wide angular span. From the radio window, there were no bursts detected in the solar atmosphere. Solar activity next week is predicted to stay quiet.
Geomagnet conditions on December, 8th – 14th, 2017 was in quiet conditon. Local response from Kupang, Manado, and Biak observatory seen from index K with maximum value is 3. Minimum Dst index was -24 nT on December 12th, 2017 and maximum Kp index was 4. Substorm occurred on that time with the Ae index intensity was ≤1500 nT for 5 hours duration. The electron flux on the beginning of the period were at high conditions around 1000 [/cm2/sec/sr] and the rest were at low level around 100 [/cm2/sec/sr].
Ionosphere conditions in this week were quiet besides moderate on 9th December.
The moderate level was regarding the depression of foF2 more than 30% of its median value for about 3 hours duration. While the minimum frequencies (fmin) of the ionosphere in this week were in quiet conditions. Based on the ionospheric observations using GISTM over Bandung and Biak the scintillation (S4) condition for this week was in quiet level with S4 index value were below 0.25. The error positioning conditions were in normal level conditions which determined by the +/- 1 of index W values.
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