Detailed Information

Solar Activity

Solar activity on 28 August 2026, 04:00 UT - 29 August 2026, 03:59 UT was eruptive.
Solar activity on 29 August 2026, 04:00 UT - 30 August 2026, 03:59 UT was eruptive.
Solar activity on 30 August 2026, 04:00 UT - 31 August 2026, 03:59 UT was eruptive

A single C-class flare was observed, a C2.2 flare from NOAA 14513, peaking at 16:56 UT. No solar radio burst was reported. Meanwhile, one coronal mass ejection was observed, originating from the eastern limb with a speed of 403 km/s and an angular width of 12 degrees. On the visible disk, SDO/HMI data showed five active regions: NOAA 14513, NOAA 14515, NOAA 14517, NOAA 14518, and NOAA 14520. BBSO also identified one H-alpha plage, NOAA 14519. Looking ahead, three regions are due to return from the farside between August 31 and September 02. 

For the next 24 hours, solar activity is predicted to remain eruptive.
 

Geomagnetic Activity

The geomagnetic activity was at quiet level on August 28th, 2026 04:00 UT - August 29th, 2026 03.59 UT.
The geomagnetic activity was at active level on August 29th, 2026 04:00 UT - August 30th, 2026 03.59 UT.
The geomagnetic activity was on quiet level for the last 24 hours.

The solar wind speed increase from 339 km/s and 492 km/s, north-south component of interplanetary magnetic field fluctuate between -11.4 nT and 9.0 nT. Coronal holes at north-east were not geoeffective.

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

Ionospheric Activity

Ionosphere was in quiet conditions for August 28th, 04:00 UT - August 29th, 03:59 UT.

Ionosphere was in quiet conditions for August 29th, 04:00 UT - August 30th, 03:59 UT.

Ionosphere was in quiet conditions for August 30th, 04:00 UT - August 31th, 03:59 UT.

There was no depression of foF2 lower than 30% of its median value in the last 72 hours. There was  increment of fmin more than 30% of its median values for 0, 0 and 75 minutes respectively for the last 72 hours. The Spread-F occurred for 345, 0 and 0 minutes respectively for the last 72 hours. The Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times for 945, 765 and 960  minutes respectively for the last 72 hours. The S4 index values was on moderate level (S4> 0.4), quiet level (S4< 0.4) and quiet level (S4> 0.4) and the maximum TEC index value was at 65.16, 69.19 and 69.57  respectively, over Pontianak for the last 72 hours.

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 August 28th, 04:00 UT - August 29th, 03:59 UT. was in normal level.

Based on TEC and scintilation , the error of the single frequency GPS positioning for August 29th, 05:00 UT - August 30th, 03:59 UT. was in normal level.

Based on TEC and scintilation , the error of the single frequency GPS positioning for August 30th, 04:00 UT - August 31th, 03:59 UT. was in normal level.

 

Based on ionospheric scintilation and TEC variation, the probability of error positioning in 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 quiet on August 28th, 04:00 UT - August 29th, 03:59 UT.

MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in quiet on August 29th, 04:00 UT - August 30th, 03:59 UT.

MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in moderate on August 30th, 04:00 UT - August 31th, 03:59 UT.

 

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

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

Satellites

The electron flux was at low level on August 28th, 2026 04:00 UT – August 29th, 2026 03:59 UT.
The electron flux was at low level on August 29th, 2026 04:00 UT – August 30th, 2026 03:59 UT.
The electron flux was on low level for the last 24 hours.

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

The flux of high-energy protons on 28 August 2026, 04:00 UT - 29 August 2026, 03:59 UT was quiet.
The flux of high-energy protons on 29 August 2026, 04:00 UT - 30 August 2026, 03:59 UT was quiet.
The flux of high-energy protons on 30 August 2026, 04:00 UT - 31 August 2026, 03:59 UT was quiet.

These quiet conditions are expected to continue for the next 24 hours.