Detailed Information

Solar Activity

Solar activity for 5 June, 04:00 UT – 6 June, 03:59 UT was eruptive.
solar activity for 6 June, 04:00 UT – 7 June, 03:59 UT was active.
solar activity for 7 June, 04:00 UT – 8 June, 03:59 UT was eruptive.

Solar activity over the past 24 hours was eruptive, characterized by 18 C-class flares, with no M-class or X-class flares observed. The most significant event was a C7.2 flare peaking at 2:49 UT from NOAA 14465.0. Associated with this activity, there were 9 Type III radio bursts, with no Type II or Type IV radio bursts reported. Four coronal mass ejections (CMEs) were observed. One CME from the west limb exhibited a speed of 679 km/s and an angular width of 12 degrees. No CMEs were observed from the east limb.

On the visible disk, eight active regions were observed by SDO/HMI: NOAA 14455, NOAA 14456, NOAA 14458, NOAA 14459, NOAA 14461, NOAA 14462, NOAA 14463, and NOAA 14464. Meanwhile, no H-alpha plages were observed by BBSO. Looking ahead, one active region from the farside is expected to return to the visible disk between 08 Jun and 10 Jun. The solar activity for the next 24 hours is predicted to remain eruptive, with the Random Forest model forecasting a maximum flare class of C.

Geomagnetic Activity

The geomagnetic activity was at minor storm level on 05 June 2026 04UT - 06 June 2026 04UT.
The geomagnetic activity was at active level on 06 June 2026 04UT - 07 June 2026 04UT.
The geomagnetic activity was on quiet level for the last 24 hours.

The solar wind speed decrease from 633 km/s to 527 km/s, north-south component of interplanetary magnetic field fluctuate between -5.1 nT and 5.1 nT. Coronal holes at south-west, eastern equator and south-east were not geoeffective. CME on 07 June 2026 08:00 UT was mainly errupted toward south-west with speed of 529 km/s and angular width of 18°. The CME was geoeffective and is likely to have not impact on next 24 hours.

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

Ionospheric Activity

Ionosphere activity for 05 Juni 2026 04UT - 06 Juni 2026 04UT was on moderate level.
Ionosphere activity for 06 Juni 2026 04UT - 07 Juni 2026 04UT was on quiet level.
Ionosphere activity was on quiet level for the last 24 hours.

There was depression of foF2 lower than 30% of its median value for 180 minutes for the first 24 hours. There was 30, 195, and 45 minutes increment of fmin more than 30% of its median values at the last 72 hours. The Spread-F was detected for 120 minutes for the first 24 hours. There was 825, 735, dan 825 minutes Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times in the last 72 hours. The S4 index values (condition of ionospheric scintillation ) was less than 0.5 (quiet) and the maximum TEC index value was less than 125 (quiet) for the last 72 hours, 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 05 Juni 2026 04UT - 06 Juni 2026 04UT was at a normal level.
the error of the single-frequency GPS positioning for 06 Juni 2026 04UT - 07 Juni 2026 04UT was at a normal level.
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 minor level for 05 Juni 2026 04UT - 06 Juni 2026 04UT.
MUF depression was in quiet level and Short Wave Fadeout (SWF) was in strong level for 06 Juni 2026 04UT - 07 Juni 2026 04UT.
MUF depression was in quiet level and Short Wave Fadeout (SWF) was in moderate 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 quiet level due to the prediction of a solar flare.

Satellites

The electron flux was at low level on 05 June 2026 04UT - 06 June 2026 04UT.
The electron flux was at high level on 06 June 2026 04UT - 07 June 2026 04UT.
The electron flux was on high level for the last 24 hours.

High level of electron flux is expected for the next 24 hours.

The flux of high-energy proton for 5 June, 04:00 UT – 6 June, 03:59 UT was quiet.
The flux of high-energy proton for 6 June, 04:00 UT – 7 June, 03:59 UT was quiet.
The flux of high-energy proton for 7 June, 04:00 UT – 8 June, 03:59 UT was quiet.

Based on current conditions, quiet proton flux levels are expected to continue for the next 24 hours.