Detailed Information

Solar Activity

Solar activity was eruptive in the last 24 hours.

There were 3 C-class flares, with the maximum flare class being C1.5 from NOAA 4284 peaking at 5:35 UT. There was 1 type III solar radio burst and 2 CME events in the last 24 hours. The west-directed CME has the highest median velocity of 1838 km/s with an angular width of 10 degrees and no east-directed CME are observed. The latest SDO/HMI Intensitygram data shows 4 active regions (NOAA 4283, 4284, 4285, and 4286) and the latest BBSO H-Alpha data shows 2 plages (NOAA 4279, and 4280). Farside data shows no active region is going to appear from the east limb of the Solar disk in the next 24 hours.

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

Geomagnetic Activity

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

The solar wind speed decrease from 591 km/s to 447 km/s, north-south component of interplanetary magnetic field decrease from 7.3 nT to -5.3 nT There was geoeffective coronal hole at south pole, while the others at north-west, eastern equator and north-east were not geoeffective. CME on 18 November 2025 20:48 UT was mainly errupted toward south-west with speed of 485 km/s and angular width of 76°. 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 Ionosphere conditions cannot be delivered within the last 24 hours.

Evaluation of the foF2 value, the increase in the fmin value, Spread-F, and the Sporadic E-Layer cannot be reported due to problems with the CADI station. The S4 index values (condition of ionospheric scintillation) was quiet (S4 < 0.5) and TEC index was quiet (VTEC<125).

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

Navigation

Based on TEC 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 for next 24 hours is predicted at a normal level.

HF Radio Communication

The Maximum Usable Frequency (MUF) Depression and the Short Wave Fadeout (SWF) cannot be reported within the last 24 hours.

The MUF depression for next 24 hours is predicted on quiet level, due to previous of geomagnetic activity.

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

Satellites

The electron flux was on low 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 condition, the flux of high-energy protons is predicted to be quiet for the next 24 hours.