Detailed Information

Solar Activity

Solar activity for 24 August, 04:00 UT – 25 August, 03:59 UT was active.
Solar activity for 25 August, 04:00 UT – 26 August, 03:59 UT was active.

Solar activity over the past 24 hours was Active. A total of six solar flares were observed, comprising three C-class flares and three M-class flares. No X-class flares were observed. The most significant event was an M6.9 flare originating from NOAA 14513, which peaked at 10:02UT. Associated with the flare activity, two Type III solar radio bursts were detected, while no Type II or Type IV radio bursts occurred. Additionally, four coronal mass ejections were observed, with events from the west limb exhibiting a median speed of 456 km/s and an angular width of 62 degrees, and events from the east limb showing a median speed of 379 km/s and an angular width of 70 degrees.

On the visible disk, four active regions were identified by SDO/HMI: NOAA 14513, NOAA 14515, NOAA 14516, and NOAA 14517. There were no BBSO H-Alpha plages present. Looking ahead, one farside region is anticipated to return to the visible disk between August 26 and August 28. The solar activity for the next 24 hours is predicted to remain active, with the Random Forest model forecasting the potential for M-class flares.
 

Geomagnetic Activity

The geomagnetic activity was at quiet level on 24 August 2026 04UT - 25 August 2026 04UT.
The geomagnetic activity was at quiet level for the last 24 hours.

The solar wind speed decrease from 398 km/s to 324 km/s, north-south component of interplanetary magnetic field fluctuate between -4.1 nT and 6.3 nT. There was geoeffective coronal hole at south pole, while the others at north pole were not geoeffective. CME on 25 August 2026 08:24 UT was mainly errupted toward north-west with speed of 456 km/s and angular width of 62°. The CME was geoeffective and is likely to have not impact on next 24 hours.

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

Ionospheric Activity

The ionosphere was at a quiet level for 24 August 2026 04UT - 25 August 2026 04UT.
The ionosphere was at a quiet level for the last 24 hours.

There was no depression of foF2 lower than 30% of its median value for the last 48 hours. There was 15 and 75 minutes increment of fmin more than 30% of its median value for the last 48 hours. The Spread-F was detected for 105 and 90 minutes for the last 48 hours. There were 1185 and 750 minutes of Sporadic-E that occurred in the night and daytime, with foEs values exceeding foF2 several times. The S4 index values (condition of ionospheric scintillation ) were less than 0.5, and the maximum TEC index value was 65.76 and 66.45, both over Pontianak.

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

Navigation

Based on TEC and scintillation, the error of the single-frequency GPS positioning for the last 48 hours was at a normal level.

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

HF Radio Communication

MUF depression was at a quiet level, and Short Wave Fadeout (SWF) was at a quiet and moderate level for the last 48 hours.

The MUF depression for the next 24 hours is predicted on a quiet level, due to previous geomagnetic activity.
The SWF for the next 24 hours is predicted at a minor level due to the prediction of a solar flare.

Satellites

The electron flux was at high level on 24 August 2026 04UT - 25 August 2026 04UT.
The electron flux was at high level for the last 24 hours.

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

The flux of high-energy proton for 24 August, 04:00 UT – 25 August, 03:59 UT was event in progress.
The flux of high-energy proton for 25 August, 04:00 UT – 26 August, 03:59 UT was event in progress.

The 10 MeV proton flux remained elevated over the past 24 hours, with an event currently in progress. This elevated condition is predicted to continue for the next 24 hours.