Detailed Information

Solar Activity

Solar activity was active for December 12th, 2025 04.00 UT - December 13th, 2025 03.59 UT.
Solar activity was eruptive for December 13th, 2025 04.00 UT - December 14th, 2025 03.59 UT.
Solar activity was eruptive for December 14th, 2025 04.00 UT - December 15th, 2025 03.59 UT.    

There were 5 flares with all of them are C-class flares in the last 24 hours. The maximum flare class was C3.8 from NOAA4 4296 peaked at 07:42 UT. There was no solar radioburst occured in the last 24 hours. There was 3 CME event in the last 24 hours. The east-directed CME has the highest median velocity of 1137 km/s with an angular width of 14 degrees and the west-directed CME has the highest median velocity of 351 km/s with an angular width of 54 degrees. The latest SDO/HMI Intensitygram data shows 5 active regions (NOAA 4304, 4305, 4307, 4308, and 4309) and the latest BBSO H-Alpha data shows 2 H-Alpha plages (NOAA 4303 and 4306). Based on farside data shows 3 regions due to return 15 Dec to 17 Dec from the east limb of the Solar disk.

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

Geomagnetic Activity

The geomagnetic activity was at minor storm level on 12 December 2025 04:00UT - 13 December 2025 03:59UT.
The geomagnetic activity was at active level on 13 December 2025 04:00UT - 14 December 2025 03:59UT.
The geomagnetic activity was at quiet level on 14 December 2025 04:00UT - 15 December 2025 03:59UT.

The solar wind speed decrease from 707 km/s to 411 km/s, north-south component of interplanetary magnetic field stable around 3.3 nT. There was geoeffective coronal hole at north pole, while the others at eastern equator and south-east were not geoeffective. CME on 14 December 2025 07:24 UT was mainly errupted toward south-west with speed of 351 km/s and angular width of 54°. 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

Evaluation of the ionospheric activity, foF2 value, the increase in the fmin value, Spread-F, and the Sporadic E-Layer cannot be reported due to problems at the CADI station. However the S4 index values (condition of ionospheric scintillation) was on quiet level (S4<0.5) on 12 December 2025, 04:00 UT-15 December 2025, 03:59 UT over Pontianak. TEC index was on quiet level (VTEC<125) on 12 December 2025, 04:00 UT-15 December 2025, 03:59 UT over Pontianak.

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

Navigation

Based on TEC and scintilation, the error of the single-frequency GPS positioning for 12 December 2025, 04:00 UT-13 December 2025, 03:59 UT was in normal level.

Based on TEC and scintilation, the error of the single-frequency GPS positioning for 13 December 2025, 04:00 UT-14 December 2025, 03:59 UT was in normal level.

Based on TEC and scintilation, the error of the single-frequency GPS positioning for 14 December 2025, 04:00 UT-15 December 2025, 03:59 UT was in normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning in the next 24 hours is predicted in normal level.

HF Radio Communication

The evaluation of MUF depression and Short Wave Fadeout (SWF) data can not be reported due to problems at the CADI station.

The MUF depression on the next 24 hours is predicted in quiet level based on Geomagnetic activity.

The SWF for the next 24 hours is predicted in quiet level due to the prediction of the solar flare.

Satellites

The electron flux was at high level on 12 December 2025 04:00UT - 13 December 2025 03:59UT.
The electron flux was at low level on 13 December 2025 04:00UT - 14 December 2025 03:59UT.
The electron flux was at low level on 14 December 2025 04:00UT - 15 December 2025 03:59UT.

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

The flux of high-energy protons was quiet for December 12th, 2025 04.00 UT - December 13th, 2025 03.59 UT.
The flux of high-energy protons was quiet for December 13th, 2025 04.00 UT - December 14th, 2025 03.59 UT.
The flux of high-energy protons was quiet for December 14th, 2025 04.00 UT - December 15th, 2025 03.59 UT.

Based on today's conditon, the flux of high energy proton is predicted to be in quiet condition for the next 24 hours.