Detailed Information

Solar Activity

Solar activity for 26 Juni 2026, 04:00 UT - 27 Juni 2026, 03.59 UT was eruptive,
Solar activity for 27 Juni 2026, 04:00 UT - 28 Juni 2026, 03.59 UT was eruptive,
Solar activity for 28 Juni 2026, 04:00 UT - 29 Juni 2026, 03.59 UT was eruptive,

Solar activity was eruptive in the last 24 hours.
There were 7 C-class flares in which the maximum flare class was C9.5 from NOAA 14475 peaked at 21:44 UT. No solar radiobursts and 4 CMEs occurred in the last 24 hours. The east-directed CME has the highest median velocity of 694 km/s with an angular width of 8 degrees and the west-directed CME has the highest median velocity of 555 km/s with an angular width of 26 degrees. The latest SDO/HMI Intensitygram data shows 6 active regions (NOAA 14475, NOAA 14476, NOAA 14477, NOAA 14478, NOAA 14479, and NOAA 14480) and the latest BBSO H-Alpha data shows 2 plages (NOAA 14472 and NOAA 14473). Based on farside data, two new regions are due from the east limb of the Solar disk for the next 24 hours.

Based on today's condition, solar activity for the next 24 hours is predicted at active level.

Geomagnetic Activity

The geomagnetic activity was at quiet level on 26 June 2026 07UT - 27 June 2026 07UT.
The geomagnetic activity was at quiet level on 27 June 2026 07UT - 28 June 2026 07UT.
The geomagnetic activity was on quiet level for the last 24 hours.

The solar wind speed decreased from 630 km/s to 469 km/s, the north-south component of interplanetary magnetic field stable around 0.3 nT. There were geoeffective coronal holes at western equator, central equator and north-west, while the others at south-east and north-east were not geoeffective.

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

Ionospheric Activity

Ionosphere was in quiet conditions for June 26th, 04:00 UT - June 27th, 03:59 UT.

Ionosphere was in quiet conditions for June 27th, 04:00 UT - June 28th, 03:59 UT.

Ionosphere was in moderate conditions for June 28th, 04:00 UT - June 29th, 03:59 UT.

There was depression of foF2 lower than 30% of its median value for 0, 0 and 135 minutes in the last 72 hours. There was  increment of fmin more than 30% of its median values for 105, 255 and 75 minutes respectively for the last 72 hours. The Spread-F occurred for 345, 0 and 120 minutes respectively for the last 72 hours. The Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times for 1230, 870  and 720 minutes respectively for the last 72 hours. The S4 index values was quiet level (S4<0.5) and the maximum TEC index value was at 66.12, 69.1 and 67.58 respectively, over Pontianak for the last 72 hours.

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

Navigation

Based on TEC and scintilation , the error of the single frequency GPS positioning for June 26th, 04:00 UT - June 27th, 03:59 UT was in normal level.

Based on TEC and scintilation , the error of the single frequency GPS positioning for June 27th, 04:00 UT - June 28th, 03:59 UT was in normal level.

Based on TEC and scintilation , the error of the single frequency GPS positioning for June 28th, 04:00 UT - June 29th, 03:59 UT 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 June 26th, 04:00 UT - June 27th, 03:59 UT.

MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in strong on June 27th, 04:00 UT - June 28th, 03:59 UT.

MUF depression was in strong condition and Short Wave Fadeout (SWF) was in moderate on June 28th, 04:00 UT - June 29th, 03:59 UT.

 

The MUF depression on the next 24 hours is predicted on quiet 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 high level on 26 June 2026 07UT - 27 June 2026 07UT.
The electron flux was at high level on 27 June 2026 07UT - 28 June 2026 07UT.
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 proton flux for 26 Juni 2026, 04:00 UT - 27 Juni 2026, 03.59 UT was on quiet level,
The proton flux for 27 Juni 2026, 04:00 UT - 28 Juni 2026, 03.59 UT was on quiet level,
The proton flux for 28 Juni 2026, 04:00 UT - 29 Juni 2026, 03.59 UT was on quiet level.

The 10 MeV proton flux is predicted to remain quiet levels for the next 24 hours.