Detailed Information

Solar Activity

Solar activity was quiet over the past 24 hours.

No flares, solar radio bursts, or coronal mass ejections were observed. SDO/HMI observed one active region on the visible disk, identified as NOAA 14528. Additionally, BBSO detected two H-alpha plages corresponding to NOAA 14529 and NOAA 14531. No farside regions were observed to be returning to the visible disk. 

For the next 24 hours,
Solar activity for 18 September 2026, 04:00 UT - 19 September 2026, 03:59 UT is predicted to be quiet.
Solar activity for 19 September 2026, 04:00 UT - 20 September 2026, 03:59 UT is predicted to be quiet.
Solar activity for 20 September 2026, 04:00 UT - 21 September 2026, 03:59 UT is predicted to be quiet.

Geomagnetic Activity

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

The solar wind speed decrease from 581 km/s to 476 km/s. North-south component of interplanetary magnetic field fluctuate between -5.2 nT and 6.9 nT. Corona hole at northern was not geoeffective. No Coronal Mass Ejection (CME) particle ejections have been detected over the past three days.

Quiet level geomagnetic activity is expected for the next 24 hours.
Quiet level geomagnetic activity is expected for 19 September 2026 04UT - 20 September 2026 04UT.
Quiet level geomagnetic activity is expected for 20 September 2026 04UT - 21 September 2026 04UT.

Ionospheric Activity

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

There was depression of foF2 lower than 30% of its median value for 30 minutes. There was 60 minutes increment of fmin more than 30% of its median values. The Spread-F was detected for 180 minutes for the last 24 hours. There was 615 minutes 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 67.22, both over Agam.

The ionosphere activity for the next 24 hours is predicted to be quiet.
The ionosphere activity on September 19th, 2026, 04:00 UT - September 20th, 2026, 03:59 UT is predicted to be quiet.
The ionosphere activity on September 20th, 2026, 04:00 UT - September 21st, 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 for the next 24 hours is predicted at a slight level.
Based on ionospheric scintilation and TEC variation, the probability of error positioning in September 19th, 2026, 04:00 UT - September 20th, 2026, 03:59 UT is predicted at a slight level.
Based on ionospheric scintilation and TEC variation, the probability of error positioning in September 20th, 2026, 04:00 UT - September 21st, 2026, 03:59 UT is predicted at a slight level.

HF Radio Communication

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

The MUF depression for the next 24 hours is predicted on quiet level, due to previous of geomagnetic activity.
The MUF depression on September 19th, 2026, 04:00 UT - September 20th, 2026, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.
The MUF depression on September 20th, 2026, 04:00 UT - September 21st, 2026, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.

The SWF for the next 24 hours is predicted in quiet level due to the prediction of solar flare.
The SWF on September 19th, 2026, 04:00 UT - September 20th, 2026, 03:59 UT is predicted in quiet level due to the prediction of solar flare.
The SWF on September 20th, 2026, 04:00 UT - September 21st, 2026, 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 19 September 2026 04UT - 20 September 2026 04UT.
Low level of electron flux is expected for 20 September 2026 04UT - 21 September 2026 04UT.

The 10 MeV proton flux remained quiet over the past 24 hours.
Based on today's conditions,
The flux of high-energy protons for 18 September 2026, 04:00 UT - 19 September 2026, 03:59 UT is predicted to be quiet.
The flux of high-energy protons for 19 September 2026, 04:00 UT - 20 September 2026, 03:59 UT is predicted to be quiet.
The flux of high-energy protons for 20 September 2026, 04:00 UT - 21 September 2026, 03:59 UT is predicted to be quiet.