Detailed Information

Solar Activity

Solar activity was eruptive in the last 24 hours.

Three C-class solar flares were observed. No M-class orX-class flares were observed. The strongest event was a C1.8 flare from NOAA 14470, peaking at 11:50UT. Associated with this activity, two Type III solar radio bursts were detected. No Type II or Type IV solar radio bursts were observed. One coronal mass ejection was observed, originating from the west limb with an estimated speed of 868 kilometers per second and an angular width of 42 degrees. No coronal mass ejections were observed originating from the east limb. The latest SDO/HMI Intensitygram data shows three active regions : NOAA 14465, NOAA 14470, and NOAA 14471. Additionally, two H-alpha plages were observed by BBSO: NOAA 14468 and NOAA 14469. Looking to the farside, one active region is expected to appear from the east limb between June 19 and June 21.

Based on today’s conditions,
solar activity for 19 Juni 2026, 04:00 UT - 20 Juni 2026, 03.59 UT is predicted to be eruptive,
solar activity for 20 Juni 2026, 04:00 UT - 21 Juni 2026, 03.59 UT is predicted to be eruptive,
solar activity for 21 Juni 2026, 04:00 UT - 22 Juni 2026, 03.59 UT is predicted to be eruptive,
driven by a forecast for C-class flares based on the Random Forest model.

Geomagnetic Activity

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


The solar wind speed fluctuate between 416 km/s and 509 km/s, north-south component of interplanetary magnetic field fluctuate between -6.6 nT and 11.4 nT There was geoeffective coronal hole at central equator, while the others at south-west, eastern equator, north pole and north-west were not geoeffective. CME on 18 June 2026 06:24 UT was mainly errupted toward west with speed of 868 km/s and angular width of 42°. The CME was geoeffective and is likely to have impact on 22 June 2026.

Quiet level geomagnetic activity is expected for 19th June 2026 04.00UT – 20th June 2026 03.59UT

Quiet level geomagnetic activity is expected for 20th June 2026 04.00UT – 21st June 2026 03.59  UT.

Quiet level geomagnetic activity is expected for 21st June 2026 04.00UT – 22nd June 2026 03.59 UT.

Ionospheric Activity

Ionospheric Activity :

Ionosphere was in quiet conditions for the last 24 hours.

There was no depression of foF2 lower than 30% of its median value for last 24 hours. There was increment of fmin more than 30% of its median values for 60 minutes for last 24 hours. There was no The Spread-F occurr for 105 minutes for last 24 hours. The Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times for 1110 minutes. The S4 index values (condition of ionospheric scintillation ) was in Quiet condition with S4 index value was less than 0.5 over Pontianak.

The ionosphere activity for 19th June 2026 04.00UT – 20th June 2026 03.59UT is predicted to be quiet.

The ionosphere activity for 20th June 2026 04.00UT – 21st June 2026 03.59 UT is predicted to be quiet.

The ionosphere activity for 21st June 2026 04.00UT – 22nd June 2026 03.59 UT is predicted to be quiet.

Navigation

Based on TEC and scintilation , the error of the single frequency GPS positioning for the last 24 hours was in Normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning for 19th June 2026 04.00UT – 20th June 2026 03.59UT is predicted at a Normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning for 20th June 2026 04.00UT – 21st June 2026 03.59 UT is predicted at a Normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning for 21st June 2026 04.00UT – 22nd June 2026 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 Moderate for the last 24 hours.

The MUF depression for 19th June 2026 04.00UT – 20th June 2026 03.59UT is predicted on quiet level, based on geomagnetic activity.

The MUF depression for 20th June 2026 04.00UT – 21st June 2026 03.59 UT is predicted on quiet level, due to previous of geomagnetic activity.

The MUF depression for 21st June 2026 04.00UT – 22nd June 2026 03.59 UT is predicted on quiet level, due to previous of geomagnetic activity.

 

The SWF for 19th June 2026 04.00UT – 20th June 2026 03.59UT is predicted in Quiet level due to the prediction of solar flare.

The SWF for 20th June 2026 04.00UT – 21st June 2026 03.59 UT is predicted in quiet level due to the prediction of solar flare.

The SWF for 21st June 2026 04.00UT – 22nd June 2026 03.59 UT is predicted in quiet level due to the prediction of solar flare.

Satellites

The electron flux

The electron flux was on high level for the last 24 hours.

Low level of elektron flux is expected for 19th June 2026 04.00UT – 20th June 2026 03.59UT

Low level of elektron flux is expected for 20th June 2026 04.00UT – 21st June 2026 03.59UT.

Low level of elektron flux is expected for 21st June 2026 04.00UT – 22nd June 2026 03.59UT

The 10 MeV proton flux remained at quiet levels over the past 24 hours.

Based on today’s conditions,
proton flux for 19 Juni 2026, 04:00 UT - 20 Juni 2026, 03.59 UT is predicted to be quiet,
proton flux for 20 Juni 2026, 04:00 UT - 21 Juni 2026, 03.59 UT is predicted to be quiet,
proton flux for 21 Juni 2026, 04:00 UT - 22 Juni 2026, 03.59 UT is predicted to be quiet.