Detailed Information

Solar Activity

Solar activity over the past 24 hours was eruptive, with two C-class flares observed. No M-class or X-class flares occurred. The strongest event was a C2.5 flare peaking at 15:19 UT from UNKNOWN REGION. Associated with this activity, one Type III solar radio burst was detected. Additionally, one coronal mass ejection was observed, originating from the west limb with a speed of 367 km/s and an angular width of 196 degrees. No coronal mass ejections were observed from the east limb.

On the visible disk, three active regions were identified by SDO/HMI: NOAA 14535, NOAA 14536, and NOAA 14542. Three H-alpha plages were also noted by BBSO: NOAA 14533, NOAA 14539, and NOAA 14543. Looking to the farside, two regions are expected to return between 29 September and 01 October. For the next 24 hours, solar activity is predicted to be eruptive.

Geomagnetic Activity

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

The solar wind speed decrease from 457 km/s to 337 km/s. The north-south component of interplanetary magnetic field stable around -0.7 nT. Corona hole at western equator was not geoeffective and the others at eastern equator were geoeffective. CME on 28 September 2026 14:12 UT was Halo III with speed of 362 km/s and angular width of 204°. 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

Ionosphere was in Quiet level for the last 24 hours.

There was depression of foF2 lower than 30% of its median values for 15 minutes.There was increment of fmin more than 30% of its median values for 15 minutes. The Spread-F occured for 180 minutes. The Sporadic E layer occured in the night and daytime for 435 minutes with foEs value exceeded the foF2 for 15 minutes. The S4 index values (condition of ionospheric scintillation) was on Moderate (S4 < 0.8) level last 24 hours over Agam. The TEC values was on Quiet (VTEC < 125) level last 24 hours over Agam.

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

Navigation

For the last 24 hours, the error of the single frequency GPS positioning was on Slight level.

The probability of error positioning for the next 24 hours is predicted to be Slight, based on scintillation and TEC variations.

HF Radio Communication

The MUF(Maximum Usable Frequency) depression was in Quiet condition and the SWF (Short Wave Fadeout) was in Quiet for the last 24 hours.

The MUF depression for the next 24 hours is predicted to be Quiet, based on prediction of geomagnetic activity.

The SWF for the next 24 hours is predicted to be Quiet, based on prediction of Solar activity.

Satellites

The electron flux was on high level for the last 24 hours.
High level of elektron flux is expected for the next 24 hours.

The 10 MeV proton flux remained quiet over the past 24 hours. These quiet conditions are expected to continue for the next 24 hours.