Detailed Information

Solar Activity

Solar activity was eruptive in the last 24 hours.    

A total of twelve C-class flares were observed. The most significant event was a C4.3 flare originating from NOAA 14477, peaking at 00:22 UT. No solar radio bursts were reported. One coronal mass ejection was detected, originating from the east limb with a speed of 271 km/s and an angular width of 14 degrees. On the visible disk, eight active regions were identified by SDO/HMI: NOAA 14470, NOAA 14472, NOAA 14473, NOAA 14475, NOAA 14476, NOAA 14477, NOAA 14478, and NOAA 14479. Additionally, one H-Alpha plage, NOAA 14471, was observed by BBSO. Looking to the farside, three regions are expected to return to the visible disk between June 25 and June 27.

For the next 24 hours, the solar activity is predicted to be active.

Geomagnetic Activity

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

The solar wind speed increases from 327 km/s to 418 km/s, and the north-south component of the interplanetary magnetic field fluctuates between -7.2 nT and 6.9 nT. There were geoeffective coronal holes at the central equator and north-east, while the others at north-east were not geoeffective. CME on 24 June 2026 12:48 UT was mainly erupted toward north-west with a speed of 271 km/s and an angular width of 14°. The CME was geoeffective and is likely to have no impact on the next 24 hours.

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

Ionospheric Activity

The ionosphere was on a quiet level for the last 24 hours.

There was no depression of foF2 lower than 30% of its median value. There was a 375-minute increment of fmin, more than 30% of its median values. The Spread-F was detected for 570 minutes over the last 24 hours. There was a Sporadic-E layer that occurred in the night and daytime, with foEs values exceeding the foF2 several times for 810 minutes. The S4 index values (condition of ionospheric scintillation) were between 0.5 and 0.8, and the maximum TEC index value was at 66.89, both over Pontianak.

Ionospheric activity over the next 24 hours is predicted to be quiet.

Navigation

The error of the single-frequency GPS positioning for the last 24 hours was at a slight level, based on ionospheric scintillation and TEC variations.

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 was in quiet level and Short Wave Fadeout (SWF) was in severe level for the last 24 hours.

The MUF depression for the next 24 hours is predicted on quiet level, due to previous of 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 low level for the last 24 hours.

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

The 10 MeV proton flux remained at quiet levels over the past 24 hours.
These quiet conditions are expected to continue for the next 24 hours.