The Sun is at minimum phase of cycle 24, without flare, radio burst or coronal mass ejection within the last week. There is one spotless region appeared at solar disk, that is NOAA 12717. There is no new region predicted to appear at east limb for the next week. Therefore, solar activity next week is predicted to be at quiet level.
Local geomagnetic condition during 3rd – August 9st was on quiet level. Maximum local K index of Manado and Sumedang observatory has not exceed 3. The solar wind’s speed was around from 300 km/s until 450 km/s. Interplanetary magnetic field was fluctuating from -5 to +5. The electron flux on radiation belt was on low level at this week.
Ionosphere conditions in this week were in quiet to moderate level. There was depression of foF2 more than 30% from its median everyday from 3 to 9 August 2018. The foF2 depression that affect to the radiowave propagation over the ionosphere which is known as the MUF Depression did occur in this week. There was increment of fmin more than 30% from its median everyday from 3 to 9 August 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 remain in quiet level. Based on the ionospheric observations using GISTM over Bandung, the S4 index value (scintillation condition) was less than 0.25. The error positioning conditions were in slight to medium level condition that determined by the W-index values.
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