The sun is still at the end of the minimum phase of its activities. There was no active regions observed on the surface of the Sun. There was no flare or significant mass ejection detected in the past week. Sun's activity is expected to remain at quiet level in the upcoming week because no new eruptive region is expected to emerge.
In the period of July 9th – 15th August, 2019, the geomagnetic conditions were on quiet level. Local response from Sumedang Observatory, showed highest value at 3. Minimum Dst index was -22 nT and maximum Kp index reached 3. The highest increased in Ae index occurred on August 9th , 2019 with intensity less than 1000 nT and lasted for about 12 hours. The interplanetary magnetic field in the North-South direction (Bz) was around -5 to +5. The electron flux due to this week was in very high to high level.
Ionosphere conditions in this week were in minor to strong level.
There were depression of foF2 of more than 30% from its median during this week for 30 minutes to 555 minutes. The foF2 depression impacts the radiowave propagation over the ionosphere, which is known as the MUF Depression which is in quiet to strong level during this week. The minimum frequencies (fmin) disturbance were in quiet condition in this week. The increment of fmin could be a source of disturbance to the HF radio communication, which is known as the Shortwave Fadeout (SWF) or Radio Blackout (RB). There were Spread-F events occurred in this week during 165 minutes to 210 minutes. Sporadic-E also occurred during daytime and nighttime.
The error positioning conditions were at slight level based on the W-index values.
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