Detailed Information

Solar Activity

Solar activity was eruptive in the last 24 hours.
There was 1 flare that is C3.2 from NOAA 4312 peaking at 7:50 UT. There were 1 type=III solar radio burst and 6 CME events in the last 24 hours. The east-directed CME has the highest median velocity of 351 km/s with an angular width of 20 degrees and the west-directed CME has the highest median velocity of 258 km/s with an angular width of 12 degrees. The latest SDO/HMI Intensitygram data shows 7 active regions (NOAA 4305, 4307, 4308, 4310, 4311, 4312, and 4313), and the latest BBSO H-Alpha data shows 1 plage (NOAA 4309). Based on Farside data, 1 Regions Due to Return within the next 72 hours from the east limb of the solar disk.

Based on today's condition, 
Solar activity for December 19, 2025 04:00 UT - December 20, 2025 03:59 UT is predicted to be active.
Solar activity for December 20, 2025 04:00 UT - December 21, 2025 03:59 UT is predicted to be eruptive.
Solar activity for December 21, 2025 04:00 UT - December 22, 2025 03:59 UT is predicted to be eruptive.
 

Geomagnetic Activity

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

The solar wind speed stable around 612 km/s, north-south component of interplanetary magnetic field fluctuate between -7.4 nT and 7.3 nT There was geoeffective coronal hole at western equator, while the others at eastern equator and south-east were not geoeffective. CME on 18 December 2025 04:24 UT was mainly errupted toward south-west with speed of 117 km/s and angular width of 52°. The CME was geoeffective and is likely to have not impact until next 3 days.

Minor storm level geomagnetic activity is expected for the next 24 hours.
Quiet level geomagnetic activity is expected for 20 December 2025 04UT - 21 December 2025 04UT.
Quiet level geomagnetic activity is expected for 21 December 2025 04UT - 22 December 2025 04UT.

Ionospheric Activity

Ionosphere activity was not evaluated due to no data for the last 24 hours.
The S4 index value (condition of ionospheric scintillation) was less than 0.5 (quiet) for the last 24 hours over Pontianak. TheTEC index was less than 120 (quiet) for the last 24 hours.

The ionosphere activity is predicted to be quiet for the next 24 hours.
The ionosphere activity is predicted to be moderate for 20 December 2025 04UT - 21 December 2025 04UT.
The ionosphere activity is predicted to be quiet for 21 December 2025 04UT - 22 December 2025 04UT.

Navigation

Based on TEC and scintillation, the error of the single-frequency GPS positioning for the last 24 hours was at a normal level.

Based on ionospheric scintillation and TEC variation,
the probability of error positioning for the next 24 hours is predicted at a normal level.
the probability of error positioning for 20 December 2025 04UT - 21 December 2025 04UT is predicted at a normal level.
the probability of error positioning for 21 Desember 2025 04UT - 22 Desember 2025 04UT is predicted at a normal level.

HF Radio Communication

MUF depression and Short Wave Fadeout (SWF) were not evaluated due to no data 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 MUF depression for 20 December 2025 04UT - 21 December 2025 04UT is predicted on a moderate level, due to previous geomagnetic activity.
The MUF depression for 21 Desember 2025 04UT - 22 Desember 2025 04UT is predicted on a quiet level, due to previous geomagnetic activity.

The SWF for the next 24 hours is predicted at a minor level due to the prediction of a solar flare.
The SWF for 20 December 2025 04UT - 21 December 2025 04UT is predicted at a quiet level due to the prediction of a solar flare.
The SWF for 21 Desember 2025 04UT - 22 Desember 2025 04UT is predicted at a quiet level due to the prediction of a solar flare.

Satellites

The electron flux was on high level for the last 24 hours.

High level of electron flux is expected for the next 24 hours.
Low level of electron flux is expected for 20 December 2025 04UT - 21 December 2025 04UT.
Low level of electron flux is expected for 21 December 2025 04UT - 22 December 2025 04UT.

The flux of high-energy protons was on quiet level in the last 24 hours.

Based on today's condition,
The flux of high-energy protons for December 19, 2025 04:00 UT - December 20, 2025 03:59 UT is predicted to be quiet.
The flux of high-energy protons for December 20, 2025 04:00 UT - December 21, 2025 03:59 UT is predicted to be quiet.
The flux of high-energy protons for December 21, 2025 04:00 UT - December 22, 2025 03:59 UT is predicted to be quiet.