Detailed Information

Solar Activity

• Solar activity during 31 July, at 04:00 UT–01 August at 03:59 UT was eruptive;
• Solar activity during 01 August at 04:00 UT–02 August at 03:59 UT was eruptive;
• Solar activity during 02 August at 04:00 UT–03 August at 03:59 UT was eruptive.

Only one C-class flare occurred in the past 24 hours. It was a C6.3 peaked at 05:35 UT from NOAA 14492. No solar radio bursts nor CMEs were recorded in the past 24 hours. The latest SDO/HMI Intensitygram data shows six active regions (NOAA 14496, 14498, 14499, 14500, 14501, and 14502), while the latest BBSO H-alpha data reveals no H-alpha plages on the solar disk. GONG Calibrated Farside Map indicates that no new active region will appear on the solar limb in the next 24 hours.Based on today's conditions, solar activity for the next 24 hours is predicted to be active.

Geomagnetic Activity

The geomagnetic activity was at quiet level on 31 July 2026 04UT - 01 August 2026 04UT.
The geomagnetic activity was at quiet level on 01 August 2026 04UT - 02 August 2026 04UT.
The geomagnetic activity was on active level for the last 24 hours.

The solar wind speed increase from 262 km/s and 304 km/s, north-south component of interplanetary magnetic field fluctuate between -3.5 nT and 4.6 nT. Corona hole at south-east was not geoeffective.

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

 

Ionospheric Activity

Ionosphere was in quiet conditions for July 31th, 04UT - August 01st, 03UT.

Ionosphere was in quiet conditions for August 01st, 04 UT - August 02nd, 03UT.

Ionosphere was in minor conditions for August 02nd, 04 UT - August 03rd, 03UT.

There was depression of foF2 lower than 30% of its median value for 0, 0 and 30 minutes in the last 72 hours. There was  increment of fmin more than 30% of its median values for 90, 15 and 60 minutes respectively for the last 72 hours. The Spread-F not occurred for the last 72 hours. The Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times for 915, 1170  and 1005 minutes respectively for the last 72 hours. The S4 index values was quiet level (S4<0.4) and the maximum TEC index value was at 69.2, 66.44 and 62.34 respectively, over Pontianak for the last 72 hours.

The ionosphere activity on the next 24 hours is predicted to be minor.

Navigation

Based on TEC and scintilation , the error of the single frequency GPS positioning for July 31th, 04UT - August 01st, 03UT. was in normal level.

Based on TEC and scintilation , the error of the single frequency GPS positioning for August 01st, 04UT - August 02nd, 03UT. was in normal level.

Based on TEC and scintilation , the error of the single frequency GPS positioning for August 02nd, 04UT - August 03rd, 03UT. 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 on July 31th, 04UT - August 01st, 03UT.

MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in quiet on August 01st, 04UT - August 02ndh, 03UT.

MUF depression was in minor condition and Short Wave Fadeout (SWF) was in moderate on August 02nd, 04UT - August 03rd, 03UT.

 

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

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

Satellites

The electron flux was at low level on 31 July 2026 04UT - 01 August 2026 04UT.
The electron flux was at high level on 01 August 2026 04UT - 02 August 2026 04UT.
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 during 31 July, at 04:00 UT–01 August at 03:59 UT was major proton event;
• The flux of high-energy protons during 01 August at 04:00 UT–02 August at 03:59 UT was event in progress;
• The flux of high-energy protons during 02 August at 04:00 UT–03 August at 03:59 UT was event in progress.

Based on today's condition, the flux of high-energy proton for the next 24 hours is predicted to be quiet.