Detailed Information

Solar Activity

Solar activity over the past 24 hours was eruptive, characterized by one C-class flare. Specifically, a C1.5 flare was observed, peaking at 9:03UT from NOAA 14536. No M-class or X-class flares were observed. Associated with this activity, no solar radio bursts were observed across Type II, Type III, or Type IV classifications. Meanwhile, two coronal mass ejections were detected. One CME propagated to the west with a speed of 113 kilometers per second and an angular width of 12 degrees, while another CME was observed propagating to the east at 119 kilometers per second with an angular width of 6 degrees.

On the visible disk, eight active regions were identified by SDO/HMI: NOAA 14533, NOAA 14534, NOAA 14535, NOAA 14536, NOAA 14537, NOAA 14538, NOAA 14539, and NOAA 14542. Additionally, BBSO H-alpha observations showed two plages, NOAA 14540 and NOAA 14541. Looking beyond the visible disk, two active regions are expected to emerge from the east limb between 25 September and 27 September. 

Based on today's conditions,
solar activity for 25 sept, 04:00 UT–26 sept, 03:59 UT is predicted to be eruptive,
solar activity for 26 sept, 04:00 UT–27 sept, 03:59 UT is predicted to be eruptive,
solar activity for 27 sept, 04:00 UT–28 sept, 03:59 UT is predicted to be eruptive,
with the Random Forest model.
 

Geomagnetic Activity

The geomagnetic activity was on active level for the last 24 hours.
The solar wind speed increase from 274 km/s and 388 km/s, north-south component of interplanetary magnetic field fluctuate between -6.6 nT and 9.4 nT. Corona hole at was not geoeffective. CME on 24 September 2026 09:00 UT was mainly errupted toward west with speed of 113 km/s and angular width of 12°. The CME was geoeffective and is likely to have not impact until next 3 days.

Quiet level geomagnetic activity is expected for the next 24 hours.
Quiet level geomagnetic activity is expected for September 26th, 2026 04:00UT - September 27th ,2026 03:59UT.
Quiet level geomagnetic activity is expected for September 27th, 2026 04:00UT - September 28th, 2026 03:59UT.

Ionospheric Activity

Ionosphere was in quiet conditions for last 24 hours.

There was no depression of foF2 lower than 30% of its median value for the last 24 hours. There was increment of fmin more than 30% of its median values for 15 minutes for the last 24 hours. The Spread-F  occurred for 75 minutes for the last 24 hours. The Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times for 780 minutes for the last 24 hours. The S4 index values was quiet level (S4<0.4) and the maximum TEC index value was at 68.16, over Agam for the last 24 hours.

 

The ionosphere activity on September 25th, 04:00 UT - September 26th, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.

The ionosphere activity on September 26th, 04:00 UT - September 27th, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.

The ionosphere activity on September 27th, 04:00 UT - September 28th, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.

 

Navigation

Based on TEC and scintilation , the error of the single frequency GPS positioning for last 24 hours was in normal level.

 

Based on ionospheric scintilation and TEC variation, the probability of error positioning on September 25th, 04:00 UT - September 26th, 03:59 UT is predicted on normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on September 26th, 04:00 UT - September 27th, 03:59 UT is predicted on normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on September 27th, 04:00 UT - September 28th, 03:59 UT is predicted on normal level.

HF Radio Communication

MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in quiet for last 24 hours.

 

The MUF depression on September 25th, 04:00 UT - September 26th, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.

The MUF depression on September 26th, 04:00 UT - September 27th, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.

The MUF depression on September 27th, 04:00 UT - September 28th, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activ

 

The SWF on September 25th, 04:00 UT - September 26th, 03:59 UT is predicted in quiet level due to the prediction of solar flare.

The SWF on September 26th, 04:00 UT - September 27th, 03:59 UT is predicted in quiet level due to the prediction of solar flare.

The SWF on September 27th, 04:00 UT - September 28th, 03:59 UT is predicted in quiet level due to the prediction of solar flare.

Satellites

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

Low level of electron flux is expected for the next 24 hours.
Low level of electron flux is expected for 26th, 2026 04:00UT - September 27th ,2026 03:59UT.
Low level of electron flux is expected for 27th, 2026 04:00UT - September 28th, 2026 03:59UT.

The 10 MeV proton flux remained quiet over the past 24 hours. 

Based on these conditions,
the flux of high-energy proton for 25 sept, 04:00 UT–26 sept, 03:59 UT is predicted to be quiet,
the flux of high-energy proton for 26 sept, 04:00 UT–27 sept, 03:59 UT is predicted to be quiet,
the flux of high-energy proton for 27 sept, 04:00 UT–28 sept, 03:59 UT is predicted to be quiet.