Detailed Information

Solar Activity

Solar activity was active in the last 24 hours.

There were 16 flares with 11 C-class flares and 5 M-class flares in the last 24 hours. The maximum flare class was M4.4, from NOAA 4294, which peaked at 22:08 UT. There were 7 type III solar radio bursts and 5 CME events that occurred in the last 24 hours. The east-directed CME has the highest median velocity of 496 km/s with an angular width of 8 degrees, and the west-directed CME has the highest median velocity of 202 km/s with an angular width of 22 degrees. The latest SDO/HMI Intensitygram data shows seven active regions (NOAA 4294, 4296, 4298, 4299, 4303, 4304, 4305) and the latest BBSO H-Alpha data shows 2 H-Alpha plages (NOAA 4295 & 4300). Farside data shows 2 regions due to return 11 Dec to 13 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 a major flare.

Geomagnetic Activity

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

The solar wind speed increased from 319 km/s and 671 km/s, north-south component of the interplanetary magnetic field decreased from 3.4 nT to -5.8 nT Coronal holes at the north-east and eastern equator were not geoeffective. CME on 10 December 2025 15:12 UT was mainly erupted toward south-west with speed of 202 km/s and an angular width of 22°. The CME was geoeffective and is likely to have no impact on next 24 hours.

Minor storm level geomagnetic activity is expected for the next 24 hours.

 

 

 

Ionospheric Activity

The ionospheric activity for the last 24 hours cannot be evaluated due to unavailable data observation. In the last 24 hours, the S4 index values (condition of ionospheric scintillation) were lower than 0.5, and the maximum TEC index value was at 82.4, both over Pontianak.

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

 

 

Navigation

Based on TEC variation and scintilation, the error of the single-frequency GPS positioning for the last 24 hours was in normal level.

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

HF Radio Communication

The MUF depression and Short Wave Fadeout (SWF) for the last 24 hours cannot be evaluated due to unavailable data observation.

The MUF depression on the next 24 hours is predicted in strong level due to previous of geomagnetic activity.

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

Satellites

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

Low 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.