Detailed Information

Solar Activity

Solar activity for 11 September, 04:00 UT–12 September, 03:59 UT was quiet;
Solar activity for 12 September, 04:00 UT–13 September, 03:59 UT was eruptive;
Solar activity for 13 September, 04:00 UT–14 September, 03:59 UT was eruptive.

Solar activity over the past 24 hours was eruptive, with one C-class flare observed. The event was a C1.4 flare originating from NOAA 14528, peaking at 19:4 5UT. Associated with this flare, one Type III radio burst and one coronal mass ejection was observed, originating from the west limb with a speed of 776 km/s and an angular width of 52 degrees. 
On the visible disk, six active regions were identified by SDO/HMI: NOAA 14524, NOAA 14525, NOAA 14527, NOAA 14528, NOAA 14529, and NOAA 14530. Additionally, one H-Alpha plage, NOAA 14526, was observed by BBSO. No new region is due to return fot the next 24 hours.

Based on today's condition, solar activity is predicted to be quiet for the next 24 hours.

Geomagnetic Activity

The geomagnetic activity was at quiet level on 11 September 2026 07UT - 12 September 2026 07UT.
The geomagnetic activity was at quiet level on 12 September 2026 07UT - 13 September 2026 07UT.
The geomagnetic activity was on quiet level for the last 24 hours.

The solar wind speed fluctuate between 320 km/s and 432 km/s, north-south component of interplanetary magnetic field fluctuate between -6.7 nT and 6.9 nT There were geoeffective coronal holes at north-east and central equator, while the others at north pole and north-west were not geoeffective. CME on 13 September 2026 19:36 UT was mainly errupted toward west with speed of 776 km/s and angular width of 52°. The CME was geoeffective and is likely to have not impact on next 24 hours.

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

Ionospheric Activity

Ionosphere activity for 11 September 2026 04UT - 12 September 2026 04UT was on quiet level.

Ionosphere activity for 12 September 2026 04UT - 13 September 2026 04UT was on quiet level.

Ionosphere activity was on quiet level for the last 24 hours.

There was no depression of foF2 lower than 30% of its median value for the last 72 hours. There was no increment of fmin more than 30% of its median values at the last 72 hours. The Spread-F was detected for 75 minutes for 11 September 2026 04UT - 12 September 2026 04UT. There was 885, 1125, dan 405 minutes Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times in the last 72 hours. The S4 index values (condition of ionospheric scintillation) for 11 September 2026 04UT - 13 September 2026 04UT was less than 0.5 (quiet), 0,5 < S4 < 0,8 (moderate) for the last 24 hours, and the maximum TEC index value was less than 125 (quiet) for the last 72 hours, both over Pontianak.

The ionosphere activity for the next 24 hours is predicted to be quiet level due to the prediction of a solar flare.

Navigation

Based on TEC and scintillation,

the error of the single-frequency GPS positioning for 11 September 2026 04UT - 12 September 2026 04UT was at a normal level.

the error of the single-frequency GPS positioning for 12 September 2026 04UT - 13 September 2026 04UT was at a normal level.

the error of the single-frequency GPS positioning for the last 24 hours was at a slight level.

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

HF Radio Communication

MUF depression was in quiet level and Short Wave Fadeout (SWF)  was in quiet level for 11 September 2026 04UT - 12 September 2026 04UT.

MUF depression was in quiet level and Short Wave Fadeout (SWF) was in quiet level for 12 September 2026 04UT - 13 September 2026 04UT.

MUF depression was in quiet level and Short Wave Fadeout (SWF) was in quiet level for the last 24 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 quiet level due to the prediction of a solar flare.

Satellites

The electron flux was at high level on 11 September 2026 07UT - 12 September 2026 07UT.
The electron flux was at high level on 12 September 2026 07UT - 13 September 2026 07UT.
The electron flux was on high level for the last 24 hours.

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

The flux of high-energy proton for 11 September, 04:00 UT–12 September, 03:59 UT was quiet;
The flux of high-energy proton for 12 September, 04:00 UT–13 September, 03:59 UT was quiet;
The flux of high-energy proton for 13 September, 04:00 UT–14 September, 03:59 UT was quiet.

Based on today's conditions, the flux of high-energy protons in the next 24 hours is predicted to be quiet.