Detailed Information

Solar Activity

Solar activity in the past 24 hours was eruptive.

Seven C-class flares occurred in the past 24 hours. The strongest was a C3.9 flare that peaked at 00:37 UT from an unknown region. One type III solar radio burst and three west-directed CMEs were observed during this period. The largest CME has a speed of 265 kilometers per second and an angular width of 82 degrees.  The latest SDO/HMI intensitygram data show four active regions (NOAA 4506, 45087, 4508, and 4510), while the latest BBSO H-alpha data show two H-alpha plages (NOAA 4499 and 4498) on the solar disk. The GONG Calibrated Farside Map indicates that two active regions are expected to appear on the solar limb between 19 and 21 August.

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

Geomagnetic Activity

The geomagnetic activity was at a minor storm level over the last 24 hours.

The solar wind speed was stable around 345 km/s, and the north-south component of the interplanetary magnetic field fluctuated between -12.2 nT and 10.1 nT. There were geoeffective coronal holes at the central equator and the north pole, while the others at the north-east and north-west were not geoeffective. CME on 18 August 2026 at 18:48 UT was mainly erupted toward the north-west with a speed of 294 km/s and an angular width of 20°. The CME was geoeffective and is likely to have no impact in the next 24 hours.

Active-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 for last 24 hours. There was increment of fmin more than 30% of its median value for 75 minutes for the last 24 hours. There was The Spread-F occurred For 150 minutes for the last 24 hours. There was The Sporadic-E occurred in the night and daytime for 825 minutes with foEs value exceeded the foF2 for last 24 hours.

S4 index values (condition of ionospheric scintillation ) was less than 0.5 over Pontianak is predicted Quite Level

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 in the next 24 hours is predicted at a Normal level.

HF Radio Communication

MUF depression was in Quiet condition and Short Wave Fadeout (SWF) was in Moderate for the last 24 hours.

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

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

Satellites

The electron flux was at a 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 anticipated to persist for the next 24 hours.