Detailed Information

Solar Activity

Solar activity for June 15, 2026 04:00 UT - June 16, 2026 03:59 UT was eruptive.
Solar activity for June 16, 2026 04:00 UT - June 17, 2026 03:59 UT was eruptive.

One C-class flare was detected, specifically a C1.0 flare from NOAA 14464 peaking at 15:32UT. No M-class or X-class flares were observed. Associated with this activity, five Type III radio bursts were reported, with no Type II or Type IV bursts. One coronal mass ejection was observed, originating from the western limb with a speed of 540 kilometers per second and an angular width of 14 degrees. No eastward CME component was detected.

On the visible disk, five active regions were identified by SDO/HMI: NOAA 14463, NOAA 14464, NOAA 14465, NOAA 14469, and NOAA 14470. Additionally, one H-Alpha plage, NOAA 14468, was observed by BBSO. Looking at the farside, three regions are due to return between June 17 and June 19.

For the next 24 hours, solar activity is predicted to remain eruptive, with the Random Forest model forecasting a maximum flare class of C.

Geomagnetic Activity

The geomagnetic activity was at quiet level on 15 June 2026 04:00UT - 16 June 2026 03:59UT.
The geomagnetic activity was at quiet level on 16 June 2026 04:00UT - 17 June 2026 03:59UT.

The solar wind speed decrease from 489 km/s to 417 km/s, north-south component of interplanetary magnetic field fluctuate between -4.5 nT and 6.3 nT. There were geoeffective coronal holes at eastern equator and western equator, while the others at north-west, south pole, north pole and north-east were not geoeffective. CME on 16 June 2026 16:00 UT was mainly errupted toward south-west with speed of 540 km/s and angular width of 14°. The CME was geoeffective and is likely to have not impact on next 24 hours.

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

Ionospheric Activity

Ionosfer was in quiet conditions on 15 June 2026 04:00 UT - 16 June 2026 03:59 UT.

Ionosfer was in quiet conditions on 16 June 2026 04:00 UT - 17 June 2026 03:59 UT.

There were no depression of foF2 lower than 30% of its median value for the last two days. There were increment of fmin more than 30% of its median values for 90 minutes, and 30 minutes in the last two days, respectively. The Spread-F were not occurred for the last two days. The Sporadic-E were occurred in the night and daytime with foEs value exceeding the foF2 value for 945 minutes, and 855 minutes in the last two days, respectively. The S4 index values (condition of ionospheric scintillation) were lower than 0.5 (quiet) in 15-17 June above Pontianak. TEC maximum at 55.98 (quiet), dan 62.23 (quiet) in the last two days above Pontianak.

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

Navigation

Based on TEC, the error of the single-frequency GPS positioning on 15 June 2026 04:00 UT - 16 June 2026 03:59 UT was at a normal level.

Based on TEC, the error of the single-frequency GPS positioning on 16 June 2026 04:00 UT - 17 June 2026 03:59 UT 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 quiet condition and Short Wave Fadeout (SWF) was in moderate level on 15 June 2026 04:00 UT - 16 June 2026 03:59 UT.

MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in minor level on 16 June 2026 04:00 UT - 17 June 2026 03:59 UT.

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 solar flare.

Satellites

The electron flux was at high level on 15 June 2026 04:00UT - 16 June 2026 03:59UT.
The electron flux was at high level on 16 June 2026 04:00UT - 17 June 2026 03:59UT.

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

The flux of high-energy protons was quiet condition for June 15th, 2026 04:00 UT - June 16th, 2026   03:59 UT.
The flux of high-energy protons was quiet condition for June 16th, 2026 04:00 UT - June 17th, 2026  03:59 UT.

Based on these conditions, the proton flux is predicted to remain quiet for the next 24 hours.