
Center for Space Research
The National Research and Innovation Agency
BRIN - Indonesia
Issued : 2026 September 17 0800 UTC
Forecast Valid For 24 Hours
Solar activity was quiet over the past 24 hours. No C-class, M-class, or X-class flares were observed, and no associated Type II, Type III, or Type IV solar radio bursts were reported. Furthermore, no coronal mass ejections were observed. On the visible disk, two active regions were identified by SDO/HMI, specifically NOAA 14527 and NOAA 14528. Two H-alpha plages were also noted by BBSO, designated NOAA 14529 and NOAA 14531. No active regions were observed returning from the farside. Looking ahead, solar activity is predicted to remain quiet for the next 24 hours, with the Random Forest model forecasting no-flare activity.
The geomagnetic activity was on quiet level for the last 24 hours.
The solar wind speed stable around 459 km/s, north-south component of interplanetary magnetic field fluctuate between -13.3 nT and 13.3 nT There were geoeffective coronal holes at western equator, while the others at north pole and eastern equator were not geoeffective.
Active level geomagnetic activity is expected for the next 24 hours.
Ionosphere was in Quiet level for the last 24 hours.
There was no depression of foF2 lower than 30% of its median values.There was increment of fmin more than 30% of its median values for 90 minutes. The Spread-F occured for 390 minutes. The Sporadic E layer occured in the night and daytime for 780 minutes with foEs value exceeded the foF2 for 60 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 next 24 hours is predicted to be Quiet.
Based on TEC and scintilation , the error of the single frequency GPS positioning for the last 24 hours was in Slight level.
Based on ionospheric scintilation and TEC variation, the probability of error positioning in the next 24 hours is predicted at a Normal level.
MUF depression was in Quiet condition and Short Wave Fadeout (SWF) was in Moderate for the last 24 hours.
The MUF depression for next 24 hours is predicted on Quiet level, due to previous of geomagnetic activity
The SWF on for next 24 hours is predicted in Quiet level due to the prediction of solar flare.
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 10 MeV proton flux remained quiet over the past 24 hours. This quiet condition is expected to continue for the next 24 hours.