The Sun is entering its minimum activity phase, such that no eruptive events these days. There is only a simple active region observed in the whole week and there will be no eruptive region expected to emerge next week. Solar activity next week is predicted to be at quiet level.
Local geomagnetic condition during September 21st – October 4th was on quiet level. Maximum local K index of Manado and Sumedang observatory was 3 while the minimum Dst index reached -22 nT and has occurred at the beginning of the week. The average solar wind’s speed was fluctuated around 360-530 km/s, due to high speed solar wind stream triggered by coronal hole near NOAA active Region 2723, which was on geoeffective position since September 28th, 2018. The electron flux on radiation was on high level at the beginning of the week due to the fast stream, but return to its low level on September 29th, 2018.
Ionosphere conditions in this week were in quiet to strong level.
The depression of foF2 lower than 30% from its median values occurred almost everyday except on 29 and 30 September 2018.. The foF2 depressions were impacted to the radio wave propagation over the ionosphere which known as the MUF Depression. There was increment of fmin of more than 30% from its median value every day, except on 1 October 2018. There was no disturbance in the HF radio communication which is known as the Shortwave Fadeout (SWF) or Radio Blackout (RB) due to Solar flare activity that remained in the quiet level. Based on the ionospheric observations using GISTM over Bandung, the scintillation (S4) condition for this week was in quiet level with S4 index value less than 0.25. The error positioning conditions were normal to slight levels conditions that determined by the index W values were between +/- 1 and +/- 2.
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