Detailed Information

Solar Activity

Solar activity was eruptive in the last 24 hours.

There were 3 C-class flares in the last 24 hours. The maximum flare class was C8.6 from NOAA 4317, which peaked at 22:31 UT. There was no solar radio burst that occurred in the last 24 hours. There were 5 CME events in the last 24 hours. The east-directed CME has the highest median velocity of 275 km/s with an angular width of 82 degrees, and no west-directed CMEs are observed. The latest SDO/HMI Intensitygram data shows 5 active regions (NOAA 4312, 4316, 4317, 4318, 4319) and the latest BBSO H-Alpha data shows 5 H-Alpha plages (NOAA 4308, 4311, 4313, 4314, 4315). Farside data shows 3 regions due to return from 23 Dec to 25 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 on quiet level for the last 24 hours.

The solar wind speed fluctuate between 476 km/s and 868 km/s, north-south component of interplanetary magnetic field fluctuate between -11.7 nT and 9.0 nT Corona hole at western equator to southern was geoeffective. The CME ejected on December 22, 2025, at 05:00 UT, was heading eastward at a speed of 155 km/s and an ejection angle of 100°. The CME was not geoeffective and is unlikely to have any impacts in the next 24 hours.

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

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.

 

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.

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 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 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 protons was quiet for the last 24 hours.

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