Detailed Information

Solar Activity

Solar activity for 4 sept 04:00 UT – 5 sept, 03:59 UT was active.
Solar activity for 5 sept, 04:00 UT – 6 sept, 03:59 UT was active.
solar activity for 6 sept, 04:00 UT – 7 sept, 03:59 UT was eruptive.

Solar activity over the past 24 hours was eruptive, characterized by two C-class flares, with no M-class or X-class flares observed. The most significant event was a C5.0 flare peaking at 10:31 UT from NOAA 14524. Associated with this activity, there were 4 Type III radio bursts, with no Type II or Type IV radio bursts reported. Two coronal mass ejections (CMEs) were observed. One CME from the east limb exhibited a speed of 606 km/s and an angular width of 30 degrees. No CMEs were observed from the west limb.

On the visible disk, seven active regions were observed by SDO/HMI: NOAA 14521, NOAA 14523, NOAA 14524, NOAA 14526, NOAA 14527, NOAA 14528, and NOAA 14529. Additionally, BBSO H-Alpha observations indicated two plages: NOAA 14520 and NOAA 14525. Looking ahead, one active region from the farside is expected to return to the visible disk between 07 and 09 sept. The solar activity for the next 24 hours is predicted to remain eruptive, with the Random Forest model forecasting a maximum flare class of C.

Geomagnetic Activity

The geomagnetic activity was at quiet level on 4 September 2026 04:00UT - 5 September 2026 03:59UT.

The geomagnetic activity was at quiet level on 5 September 2026 04:00UT - 6 September 2026 03:59UT.

The geomagnetic activity was at quiet level on 6 September 2026 04:00UT - 7 September 2026 03:59UT.

The solar wind speed stable around 340 km/s, north-south component of interplanetary magnetic field fluctuate between -5.4 nT and 5.8 nT. There were geoeffective coronal holes at central equator and western equator, while the others at north-west were not geoeffective.

Quiet level geomagnetic activity is expected for the next 24 hours.

Ionospheric Activity

Ionosfer was in quiet conditions on 4 September 2026 04:00 UT - 5 September 2026 03:59 UT.

Ionosfer was in quiet conditions on 5 September 2026 04:00 UT - 6 September 2026 03:59 UT.

Ionosfer was in quiet conditions on 6 September 2026 04:00 UT - 7 September 2026 03:59 UT.

There was no depression of foF2 lower than 30% of its median value for the last three days. There was increment of fmin more than 30% of its median values for 60 minutes on 4 September 2026 04:00 UT - 5 September 2026 03:59 UT and for 60 minutes on 6 September 2026 04:00 UT - 7 September 2026 03:59 UT. There was Spread-F layer for 465 minutes on 4 September 2026 04:00 UT - 5 September 2026 03:59 UT and for 75 minutes on 6 September 2026 04:00 UT - 7 September 2026 03:59 UT. There was Sporadic-E minutes in the night and daytime with foEs value exceeding the foF2 value for 1020 minutes, 1110 minutes, 1005 minutes for the last 3 days. The S4 index values (condition of ionospheric scintillation) was at moderate level (0.5<S4<0.8) on 4 September 2026, 04:00 UT-5 September 2026, 03:59 UT and at quiet level (S4<0.5) on 5 September 2026, 04:00 UT-7 September 2026, 03:59 UT over Pontianak. TEC index value was at quiet level (VTEC<125) with the value of nilai  62,32 TECU, 61,6 TECU, 61,06 TECU over Pontianak on the last three days.

The ionosphere activity on the next 24 hours is predicted to be quiet.

Navigation

Based on TEC and scintilation, the error of the single-frequency GPS positioning for 4 September 2026, 04:00 UT-5 September 2026, 03:59 UT was in slight level.

Based on TEC and scintilation, the error of the single-frequency GPS positioning for 5 September 2026, 04:00 UT-6 September 2026, 03:59 UT was in normal level.

Based on TEC and scintilation, the error of the single-frequency GPS positioning for 6 September 2026, 04:00 UT-7 September 2026, 03:59 UT was in normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on the next 24 hours is predicted at a normal level.

HF Radio Communication

MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in moderate level on 4 September 2026 04:00 UT - 5 September 2026 03:59 UT.

MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in quiet level on 5 September 2026 04:00 UT - 6 September 2026 03:59 UT.

MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in moderate level on 6 September 2026 04:00 UT - 7 September 2026 03:59 UT.

The MUF depression on the next 24 hours is predicted at quiet level due to previous of geomagnetic activity.

The SWF on the next 24 hours is predicted at quiet level due to the prediction of solar flare.

Satellites

The electron flux was at high level on 4 September 2026 04:00UT - 5 September 2026 03:59UT.

The electron flux was at low level on 5 September 2026 04:00UT - 6 September 2026 03:59UT.

The electron flux was at high level on 6 September 2026 04:00UT - 7 September 2026 03:59UT.

Low level of electron flux is expected for the next 24 hours.

The flux of high-energy proton for 4 sept 04:00 UT – 5 sept, 03:59 UT was quiet.
The flux of high-energy proton for 5 sept, 04:00 UT – 6 sept, 03:59 UT was major proton event.
The flux of high-energy proton for 6 sept, 04:00 UT – 7 sept, 03:59 UT was event in progress.

Based on current conditions, quiet proton flux levels are expected to continue for the next 24 hours.