Detailed Information

Solar Activity

Solar activity for December 19, 2025 04:00 UT - December 20, 2025 03:59 UT was active.
Solar activity for December 20, 2025 04:00 UT - December 21, 2025 03:59 UT was active.
Solar activity for December 21, 2025 04:00 UT - December 22, 2025 03:59 UT was active.

There were 13 flares with 12 C-class flares and 1 M-class flare in the last 24 hours. The maximum flare class was M1.3 from NOAA 4316 peaked at 18:27 UT. There were 3 solar radiobursts, all of which are type-III, that occurred in the last 24 hours. There was 1 CME event in the last 24 hours. The east-directed CME has the highest median velocity of 914 km/s with an angular width of 6 degrees and no west-directed CME are observed. The latest SDO/HMI Intensitygram data show 5 active regions (NOAA 4311, 4312, 4315, 4316, and 4317), and the latest BBSO H-Alpha data show 3 H-Alpha plages (NOAA 4308, 4313, and 4314). Based on the Farside data, there are 2 regions due to return from 22 Dec to 24 Dec from the east limb of the Solar disk.

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

Geomagnetic Activity

The geomagnetic activity was at a quiet level on 19 December 2025 07UT - 20 December 2025 07UT.
The geomagnetic activity was at a quiet level on 20 December 2025 07UT - 21 December 2025 07UT.
The geomagnetic activity was at a quiet level for the last 24 hours.

The solar wind speed increased from 374 km/s to 506 km/s, and the north-south component of the interplanetary magnetic field fluctuated between -6.7 nT and 9.3 nT. The Corona hole was not geoeffective.

Active-level geomagnetic activity is expected over the next 24 hours.

 

 

 

Ionospheric Activity

Ionosphere cannot be evaluated the last 72 hours.

The ionospheric activity for the last 72 hours cannot be evaluated due to problems with the CADI station. The S4 index values (condition of ionospheric scintillation) were less than 0.5 so the scintillation was on quiet level, and the maximum TEC index value were at 65.25 in the last 72 hours, both measurement over Pontianak.

The ionosphere activity is predicted to be quiet for the next 24 hours

Navigation

The error of the single frequency GPS positioning on December 19th, 04:00 UT - December 20th, 03:59 UT could not be evaluated, based on ionospheric scintillation and TEC variation. 

The error of the single frequency GPS positioning on December 20th, 04:00 UT - December 21st, 03:59 UT was on normal level, based on ionospheric scintillation and TEC variation. 

The error of the single frequency GPS positioning on December 21st, 04:00 UT - December 22nd, 03:59 UT was on normal level, based on ionospheric scintillation and TEC variation. 

Based on ionospheric scintillation and TEC variation, the probability of error positioning for the next 24 hours is predicted to be on normal level.

HF Radio Communication

MUF depression and Short Wave Fadeout (SWF) cannot be evaluated for the last 72 hours. 

The MUF depression for the next 24 hours is predicted at a quite 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.

Satellites

The electron flux was at a high level on 19 December 2025 07UT - 20 December 2025 07UT.
The electron flux was at a high level on 20 December 2025 07UT - 21 December 2025 07UT.
The electron flux was at a high level for the last 24 hours.

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

The flux of high-energy protons was quiet condition for December 19, 2025 04:00 UT - December 20, 2025 03:59 UT.
The flux of high-energy protons was quiet condition for December 20, 2025 04:00 UT - December 21, 2025 03:59 UT.
The flux of high-energy protons was quiet condition for December 21, 2025 04:00 UT - December 22, 2025 03:59 UT.

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