The Sun is entering its minimum activity phase, such that not many eruptive events during the past week. Event record last week contains only a number of B-class and a C-class flares from NOAA 2700 and some filament eruptions. However, there were no significant CME detected heading toward Earth related to forementioned events. NOAA 2700 with low complexity and small area has decayed early this week. There is no active region expected to emerge next week. Solar activity is predicted to be at quiet level next week.
Geomagnet conditions on March, 2nd – 8th 2018 was in very quiet conditon. Local response from Sumedang observatory seen from K index with maximum value was 2. Minimum Dst index was -5 nT on March, 4th 2018 and maximum Kp index was 2. Substorm occurred with short duration and small intensity, the Ae index showing the value of ≤ 500 nT. The electron flux were on the low level around 10-100 [/cm2/sec/sr].
Ionosphere conditions in this week were between quiet to minor level. There was depression of foF2 more than 30% from its median value at 5 March for 15 minutes duration. The foF2 depressions were impacted to the radiowave propagation over the ionosphere which known as the MUF Depression. The minimum frequencies (fmin) of the ionosphere in this week were in quiet condition. There increment of fmin could be a source of disturbance in the HF radio communication which known as the Shortwave Fadeout (SWF) or Radio Blackout (RB). Based on the ionospheric observations using GISTM over Bandung, Biak and Manado the scintillation (S4) condition for this week were in moderate level. The error positioning conditions were between normal to slight level condition that determined by the index W values.
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