Detailed Information

Solar Activity

Solar activity over the past 24 hours was eruptive. Ten C-class solar flares were observed, with the most significant event was a C9.0 flare from NOAA 14465 peaking at 8:28UT. One Type-III solar radio burst and five CMEs were observed, one of which originated from the east limb with a speed of 906 km/s and an angular width of 8 degrees. No CMEs were observed from the west limb. On the visible disk, five active regions were identified by SDO/HMI, specifically NOAA 14462, NOAA 14463, NOAA 14464, NOAA 14465, and NOAA 14466. Three H-Alpha plages were observed by BBSO, NOAA 14459, NOAA 14461, and NOAA 14467. Looking beyond the visible disk, one farside region is due to return between 12 June and 14 June. 

Based on today's condition, 
Solar activity for June 12th, 2026, 04:00 UT - June 13th, 2026, 03:59 UT is predicted to be eruptive.
Solar activity for June 13th, 2026, 04:00 UT - June 14th, 2026, 03:59 UT is predicted to be eruptive.
Solar activity for June 14th, 2026, 04:00 UT - June 15th, 2026, 03:59 UT is predicted to be eruptive.

Geomagnetic Activity

The geomagnetic activity was at an active level for the last 24 hours.

The solar wind speed increases from 382 km/s to 422 km/s. The north-south component of the interplanetary magnetic field fluctuates between -5.4 nT and 8.7 nT. There was a geoeffective coronal hole at the western equator, while the others at the north-east and eastern equator were not geoeffective. The CME on 11 June 2026 02:36 UT mainly erupted toward the east with a speed of 504 km/s and an angular width of 186°. The CME was not geoeffective and has no impact until the next 3 days.

Active level geomagnetic activity is expected for the next 24 hours.
Active level geomagnetic activity is expected for 13 June 2026 04UT - 14 June 2026 04UT.
Quiet level geomagnetic activity is expected for 14 June 2026 04UT - 15 June 2026 04UT.

Ionospheric Activity

The ionosphere was in Quiet condition for the last 24 hours.

There was a depression of foF2 lower than 30% of its median value for 15 minutes. There was no increment of fmin more than 30% of its median values. There was no Spread-F layer. The Sporadic-E occurred for 870 minutes in the night and daytime, with foEs value exceeding the foF2 value. The S4 index values (condition of ionospheric scintillation) were less than 0.5 (quiet), and the maximum TEC was 63.29 (quiet).

The ionosphere activity on June 12th, 04:00 UT - June 13th, 03:59 UT is predicted to be Quiet.
The ionosphere activity on June 13th, 04:00 UT - June 14th, 03:59 UT is predicted to be Quiet.
The ionosphere activity on June 14th, 04:00 UT - June 15th, 03:59 UT is predicted to be Quiet.

Navigation

Based on TEC and scintillation, 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 on June 12th, 04:00 UT - June 13th, 03:59 UT is predicted at a normal level.
Based on ionospheric scintillation and TEC variation, the probability of error positioning on June 13th, 04:00 UT - June 14th, 03:59 UT is predicted at a normal level.
Based on ionospheric scintillation and TEC variation, the probability of error positioning on June 14th, 04:00 UT - June 15th, 03:59 UT is predicted at a normal level.
 

HF Radio Communication

MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in quiet level for the last 24 hours.

The MUF depression on June 12th, 04:00 UT - June 13th, 03:59 UTT is predicted on a quiet level, based on the LAPAN Time Series method.
The MUF depression on June 13th, 04:00 UT - June 14th, 03:59 UT is predicted on a quiet level, due to previous geomagnetic activity.
The MUF depression on June 14th, 04:00 UT - June 15th, 03:59 UT is predicted on a quiet level, due to previous geomagnetic activity.

The SWF on June 12th, 04:00 UT - June 13th, 03:59 UT is predicted at a quiet level due to the prediction of solar flare.
The SWF on June 13th, 04:00 UT - June 14th, 03:59 UT is predicted at a quiet level due to the prediction of solar flare.
The SWF on June 14th, 04:00 UT - June 15th, 03:59 UT is predicted at a quiet level due to the prediction of solar flare.

Satellites

The electron flux was at a low level for the last 24 hours.

A low level of electron flux is expected for the next 24 hours.
Low level of electron flux is expected for 13 June 2026 04UT - 14 June 2026 04UT
High level of electron flux is expected for 14 June 2026 04UT - 15 June 2026 04UT

The 10 MeV proton flux was quiet over the past 24 hours. 

Based on current conditions, 
The proton flux is expected to be quiet for June 12nd, 2026 04:00 UT - June 13rd, 2026 03:59 UT.
The proton flux is expected to be quiet for June 13rd, 2026 04:00 UT - June 14th, 2026 03:59 UT.
The proton flux is expected to be quiet for June 14th, 2026 04:00 UT - June 15th, 2026 03:59 UT.