Detailed Information

Solar Activity

Solar activity has been eruptive over the past 24 hours. Seven C-class flares were observed, with no M-class or X-class flares occurring. The most significant event was a C5.1 flare from NOAA 14494, which peaked at 3:19UT. Associated with this activity, five Type III solar radio bursts were detected, while no Type II or Type IV radio bursts were reported. Furthermore, no coronal mass ejections were observed during this period.

On the visible disk, six active regions were identified by SDO/HMI: NOAA 14492, NOAA 14493, NOAA 14494, NOAA 14495, NOAA 14496, and NOAA 14498. Additionally, BBSO H-Alpha observations revealed two plages, NOAA 14491 and NOAA 14497. Looking beyond the visible disk, two regions are due to return between 28 July and 30 July. For the next 24 hours, solar activity is predicted to be a active, with the Random Forest model forecasting a maximum flare class of M.

Geomagnetic Activity

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

The solar wind speed decrease from 548 km/s to 373 km/s, north-south component of interplanetary magnetic field fluctuate between -4.3 nT and 3.8 nT Coronal holes at south-east and north-east were not geoeffective.

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

 

 

 

 

Ionospheric Activity

Ionosphere was on quiet level for the last 24 hours.

There was depression of foF2 lower than 30% of its median value for 165 minutes. There was no increment of fmin more than 30% of its median values. The Spread-F was not detected for the last 24 hours. There was 1215 minutes Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times. The S4 index values (condition of ionospheric scintillation ) was less than 0.5 (quiet) and the maximum TEC index value was at 69.09, both over Pontianak.

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

 

Navigation

Based on TEC and scintillation, the error of the single-frequency GPS positioning for the last 24 hours was at a normal level.

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

The MUF depression for the next 24 hours is predicted on a quiet 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 on high 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. Based on these conditions, a quiet proton flux is also predicted for the next 24 hours.