Detailed Information

Solar Activity

Solar activity was eruptive in the last 24 hours.    

Three C-class flares were observed, with no M-class or X-class flares. The most significant event was a C2.5 flare peaking at 15:06 UT from NOAA 14464. Associated with this activity, one Type III radio burst was detected, with no Type II or Type IV radio bursts observed. Four coronal mass ejections were also observed; one originated from the west limb with an estimated speed of 624 kilometers per second and an angular width of 18 degrees, while no CMEs were observed from the east limb.

On the visible disk, SDO/HMI detected three active regions, NOAA 14465, NOAA 14469, and NOAA 14470. BBSO H-alpha observations identified one plage, NOAA 14468. Furthermore, one active region is due to return from the far side between June 18 and June 20. Looking ahead, solar activity for the next 24 hours is predicted to remain eruptive, driven by a forecast for C-class flares based on the Random Forest model.

 

Geomagnetic Activity

The geomagnetic activity was on quiet level for the last 24 hours.
The solar wind speed fluctuate between 385 km/s and 466 km/s, north-south component of interplanetary magnetic field fluctuate between -7.5 nT and 11.0 nT. There were geoeffective coronal holes at central equator and western equator, while the others at north-west, south pole, north pole and eastern equator were not geoeffective. CME on 17 June 2026 15:24 UT was mainly errupted toward west with speed of 624 km/s and angular width of 18°. 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

Ionosphere was in quiet conditions for the last 24 hours.

There was no depression of foF2 lower than 30% of its median value. There was increment of fmin more than 30% of its median values for 120 minutes. The Spread-F occured for 285 minute for the last 24 hours. The Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times for 1125 minutes. The S4 index values (condition of ionospheric scintillation ) was less than 0.4 and the maximum TEC index value was at 59. 73 both over Pontianak for the last 24 hours.

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

Navigation

The error of the single-frequency GPS positioning for the last 24 hours was disturbed at a 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 disturbed at a normal level.

HF Radio Communication

Maximum Usable Frequency (MUF) Depression was in quiet condition and the Short Wave Fadeout (SWF) was in moderate for the last 24 hours.

The MUF Depression for the next is predicted to be at quiet levels based on past geomagnetic activity.

The SWF for the next 24 hours is forecasted at quiet based on predicted solar flare classes.

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 10 MeV proton flux remained quiet over the past 24 hours. These quiet conditions are expected to persist for the next 24 hours.