Detailed Information

Solar Activity

Solar activity was eruptive over the past 24 hours. 

Eight C-class flares were observed, with no M-class or X-class flares. The most significant event was a C7.9 flare from NOAA 14524, peaking at 16:30 UT. Associated with this activity, one Type III radio burst was detected, while no Type II or Type IV radio bursts were observed. Furthermore, six coronal mass ejections were observed, with one directed eastward at a speed of 1191 kilometers per second and an angular width of 44 degrees. No westward directed coronal mass ejections were reported.

On the visible disk, three active regions were identified by SDO/HMI, specifically NOAA 14521, NOAA 14523, and NOAA 14524. BBSO H-Alpha observations indicated four plages, corresponding to NOAA 14518, NOAA 14519, NOAA 14520, and NOAA 14522. Two farside regions are due to return to the visible disk between 04 September and 06 September.

Based on predictions from the random forest model, solar activity for :
September 4th, 2026 04:00 UT - September 5th, 2026 03:59 UT is predicted to be eruptive.
September 5th, 2026 04:00 UT - September 6th, 2026 03:59 UT is predicted to be eruptive.
September 6th, 2026 04:00 UT - September 7th, 2026 03:59 UT is predicted to be eruptive.

Geomagnetic Activity

The geomagnetic activity was on quiet level for the last 24 hours.

The solar wind speed fluctuated between 328 km/s and 427 km/s. The north-south component of the interplanetary magnetic field fluctuated from -4.5 nT to 4.7 nT. Coronal holes at north pole and eastern equator were not geoeffective.. CME on 03 September 2026 at 18:24 UT was mainly errupted toward the east with a speed of 271 km/s and an angular width of 90°. The CME was not geoeffective and is likely to have not impact on next 24 hours.

Quiet-level geomagnetic activity is expected for the next 24 hours.
Quiet level geomagnetic activity is expected for 05 September 2026 04UT - 06 September 2026 04UT.
Quiet level geomagnetic activity is expected for 06 September 2026 04UT - 07 September 2026 04UT.

 

 

 

 

Ionospheric Activity

Ionosphere activity for the last 24 hours was at quiet level.

There was no depression of foF2 lower than 30% of its median value. There was 150 minutes increment of fmin more than 30% of its median values. The Spread-F was detected for 240 minutes for the last 24 hours. There was 15 hours Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times. The S4 index values (condition of ionospheric scintillation ) was between 0.5 - 0.8 and the maximum TEC index value was at 60.17, both over Pontianak.

The ionosphere activity on September 4th, 2026, 04:00 UT - September 5th, 2026, 03:59 UT is predicted to be quiet.  
The ionosphere activity on September 5th, 2026, 04:00 UT - September 6th, 2026, 03:59 UT is predicted to be quiet.  
The ionosphere activity on September 6th, 2026, 04:00 UT - September 7th, 2026, 03:59 UT is predicted to be quiet.

Navigation

The error of the single frequency GPS positioning for the last 24 hours was in slight level, based on ionospheric scintilation and TEC variation.

Based on ionospheric scintilation and TEC variation, the probability of error positioning in September 4th, 2026, 04:00 UT - September 5th, 2026, 03:59 UT is predicted at a normal level.
Based on ionospheric scintilation and TEC variation, the probability of error positioning in September 5th, 2026, 04:00 UT - September 6th, 2026, 03:59 UT is predicted at a normal level.
Based on ionospheric scintilation and TEC variation, the probability of error positioning in September 6th, 2026, 04:00 UT - September 7th, 2026, 03:59 UT is predicted at a normal level.

HF Radio Communication

For the last 24 hours, MUF depression was at quiet level and Short Wave Fadeout (SWF) was at strong level.

The MUF depression on September 4th, 2026, 04:00 UT - September 5th, 2026, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.
The MUF depression on September 5th, 2026, 04:00 UT - September 6th, 2026, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.
The MUF depression on September 6th, 2026, 04:00 UT - September 7th, 2026, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.

The SWF on September 4th, 2026, 04:00 UT - September 5th, 2026, 03:59 UT is predicted in quiet level due to the prediction of solar flare.
The SWF on September 5th, 2026, 04:00 UT - September 6th, 2026, 03:59 UT is predicted in quiet level due to the prediction of solar flare. 
The SWF on September 6th, 2026, 04:00 UT - September 7th, 2026, 03:59 UT is predicted in quiet level due to the prediction of solar flare.

Satellites

The electron flux was on high level for the last 24 hours.

High level of electron flux is expected for the next 24 hours.
High level of electron flux is expected for 05 September 2026 04UT - 06 September 2026 04UT.
Low level of electron flux is expected for 06 September 2026 04UT - 07 September 2026 04UT.

The 10 MeV proton flux remained quiet over the past 24 hours. Based on the observed conditions from the preceding 24 hours, the flux of high energy proton for :
September 4th, 2026 04:00 UT - September 5th, 2026 03:59 UT is predicted to be quiet.
September 5th, 2026 04:00 UT - September 6th, 2026 03:59 UT is predicted to be quiet.
September 6th, 2026 04:00 UT - September 7th, 2026 03:59 UT is predicted to be quiet.