The Sun is entering its minimum activity phase. In the past week, there was no flare and Sun was spotless for several days. There was one type II coronal mass ejection with angular span of more than 90 degrees occurred on October 9th at 05:00 UT. There is no new eruptive region expected to emerge within the next week. Thus, next week solar activity is predicted to be quiet.
Geomagnetic activities during 6th to 12th October 2017 were in quiet level. These conditions were based on K indeces from Kupang and Biak. The geoeffective coronal holes on northern pole elongated to equator since October 8th, 2017 with positive polarity. The minimum Dst index was -43 nT on October, 12th 2017 and maximum Kp indices were 5 occurred on 11th to 12th October 2017 due to CME on October 9th, 2017 located at western hemisphere with angular width reached 96o and speed was 227 km/s. Substorm began on October 10th, 2017 at 22:00 UT reached less than 1000 nT and still on going to October 12th, 2017. The electron fluxes were at low to high conditions.
Ionosphere conditions in this week were betweeen quiet to minor level.
There was depression of foF2 more than 30% from its median value. The foF2 depressions were impacted to the radiowave propagation over the ionosphere which known as the MUF Depression. Also, the minimum frequencies (fmin) of the ionosphere in this week were in quiet conditions. The increment of fmin that could be a source of disturbance in the HF radio communication which known as a Shortwave Fadeout (SWF) or Radio Blackout (RB). Based on the ionospheric observations using GISTM over Bandung and Biak the scintillation (S4) condition for this week was in quiet to moderate level with S4 index value were between 0.25 and 0.5. The error positioning conditions were normal to slight levels conditions that determined by the index W values were between +/- 1 to +/- 2.
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