Detailed Information

Solar Activity

Solar activity was active over the past 24 hours. A total of six solar flares were observed, comprising four C-class flares and two M-class flares. No X-class flares were observed. The strongest event was an M2.8 flare peaking at 10:26 UT from NOAA 14480. Associated with this activity, one Type III solar radio burst was detected. No Type II or Type IV solar radio bursts were observed. Additionally, four coronal mass ejections were reported, with a western event showing a speed of 333 km/s and an angular width of 12 degrees, while an eastern event registered a speed of 355 km/s and an angular width of 10 degrees.

On the visible disk, three active regions were identified by SDO/HMI: NOAA 14478, NOAA 14479, and NOAA 14480. Two H-Alpha plages were also observed by BBSO, identified as NOAA 14475 and NOAA 14477. One region from the farside is due to return between July 3rd and July 5th.

Based on predictions from the random forest model, solar activity for :
July 3rd, 2026 04:00 UT - July 4th, 2026 03:59 UT is predicted to be major flare.
July 4th, 2026 04:00 UT - July 5th, 2026 03:59 UT is predicted to be active.
July 5th, 2026 04:00 UT - July 6th, 2026 03:59 UT is predicted to be active.

Geomagnetic Activity

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

The solar wind speed increase from 303 km/s to 395 km/s, and the north-south component of the interplanetary magnetic field fluctuates between -4.7 nT and 8 nT.There was geoeffective coronal hole at south pole, while the others at eastern equator and north-east were not geoeffective.

Active level geomagnetic activity is expected for the next 24 hours.
Quiet level geomagnetic activity is expected for 04 July 2026 04UT - 05 July 2026 04UT
Quiet level geomagnetic activity is expected for 05 July 2026 04UT - 06 July 2026 04UT

Ionospheric Activity

Ionosphere activity for the last 24 hours cannot be evaluated.

Ionosphere parameters such as foF2, fmin, Spread-F, and Sporadic-E cannot be evaluated due to technical problem. The S4 index values (condition of ionospheric scintillation ) was less than 0.5 and the maximum TEC index value was at 67.23, both over Pontianak.

The ionosphere activity on July 3rd, 2026, 04:00 UT - July 4th, 2026, 03:59 UT is predicted to be quiet.  
The ionosphere activity on July 4th, 2026, 04:00 UT - July 5th, 2026, 03:59 UT is predicted to be minor.  
The ionosphere activity on July 5th, 2026, 04:00 UT - July 6th, 2026, 03:59 UT is predicted to be quiet.

Navigation

The error of the single frequency GPS positioning for the last 24 hours was in normal level, based on ionospheric scintilation and TEC variation.

Based on ionospheric scintilation and TEC variation, the probability of error positioning in July 3rd, 2026, 04:00 UT - July 4th, 2026, 03:59 UT is predicted at a normal level.
Based on ionospheric scintilation and TEC variation, the probability of error positioning in July 4th, 2026, 04:00 UT - July 5th, 2026, 03:59 UT is predicted at a normal level.
Based on ionospheric scintilation and TEC variation, the probability of error positioning in July 5th, 2026, 04:00 UT - July 6th, 2026, 03:59 UT is predicted at a normal level.

 

HF Radio Communication

MUF depression and Short Wave Fadeout (SWF) level for the last 24 hours cannot be evaluated.

The MUF depression on July 3rd, 2026, 04:00 UT - July 4th, 2026, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.
The MUF depression on July 4th, 2026, 04:00 UT - July 5th, 2026, 03:59 UT is predicted on minor level, due to previous of geomagnetic activity.
The MUF depression on July 5th, 2026, 04:00 UT - July 6th, 2026, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.

The SWF on July 3rd, 2026, 04:00 UT - July 4th, 2026, 03:59 UT is predicted in strong level due to the prediction of solar flare.
The SWF on July 4th, 2026, 04:00 UT - July 5th, 2026, 03:59 UT is predicted in minor level due to the prediction of solar flare. 
The SWF on July 5th, 2026, 04:00 UT - July 6th, 2026, 03:59 UT is predicted in minor level due to the prediction of solar flare.

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.
Low level of electron flux is expected for 04 July 2026 04UT - 05 July 2026 04UT
Low level of electron flux is expected for 05 July 2026 04UT - 06 July 2026 04UT

The 10 MeV proton flux remained quiet over the past 24 hours. Based on the observed conditions from the preceding 24 hours, the flux of high energy proton for :
July 3rd, 2026 04:00 UT - July 4th, 2026 03:59 UT is predicted to be quiet.
July 4th, 2026 04:00 UT - July 5th, 2026 03:59 UT is predicted to be quiet.
July 5th, 2026 04:00 UT - July 6th, 2026 03:59 UT is predicted to be quiet.