Detailed Information

Solar Activity

Solar activity over the past 24 hours was eruptive. Five C-class solar flares were observed, with no M-class or X-class flares. The most energetic event was a C8.7 flare from NOAA 14414, peaking at 15:43UT. Associated with this flare activity, two Type III solar radio bursts were detected, while no Type II or Type IV radio bursts were reported. No coronal mass ejections were observed during this period.

On the visible disk, seven active regions were identified by SDO/HMI: NOAA 14405, NOAA 14406, NOAA 14408, NOAA 14409, NOAA 14413, NOAA 14414, and NOAA 14415. Additionally, two H-alpha plages were noted by BBSO, corresponding to NOAA 14411 and NOAA 14412. Looking ahead, one active region is due to return from the farside between April 09 and April 11. 

The overall solar activity for
april 10th, 2026 04:00 UT - april 11th, 2026 03:59 UT is predicted to be eruptive,
april 11th, 2026 04:00 UT - april 12th, 2026 03:59 UT is predicted to be eruptive,
april 12th, 2026 04:00 UT - april 13th, 2026 03:59 UT is predicted to be eruptive,
with the Random Forest (RF) model.
 

Geomagnetic Activity

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

The solar wind speed increase from 354 km/s and 448 km/s, north-south component of interplanetary magnetic field fluctuate between -5.3 nT and 4.3 nT. There were geoeffective coronal holes at central equator and eastern equator, while the others at south-east and north pole were not geoeffective.

Quiet level geomagnetic activity is expected for 10 April 2026 04:00UT - 11 April 2026 03:59UT.
Quiet level geomagnetic activity is expected for 11 April 2026 04:00UT - 12 April 2026 03:59UT.
Quiet level geomagnetic activity is expected for 12 April 2026 04:00UT - 13 April 2026 03:59UT.

 

 

 

Ionospheric Activity

The ionosphere was on quiet level for the last 24 hours.

There was no depression of foF2 lower than 30% of its median value. There was increment of fmin more than 30% of its median values for 195 minutes. There was a Spread-F layer for 570 minutes and the Sporadic-E for 555 minutes in the night and daytime with foEs value exceeding the foF2 value. The S4 index values (condition of ionospheric scintillation) was on moderate level (0.5<S4<0.8) on the last 24 hours over Pontianak. TEC index was on quiet level (VTEC<125) on the last 24 hours over Pontianak.

The ionosphere activity on 10 April 2026, 04:00 UT - 11 April 2026, 03:59 UT is predicted to be quiet.

The ionosphere activity on 11 April 2026, 04:00 UT - 12 April 2026, 03:59 UT is predicted to be quiet.

The ionosphere activity on 12 April 2026, 04:00 UT - 13 April 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 on 10 April 2026, 04:00 UT - 11 April 2026, 03:59 UT is predicted at a normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on 11 April 2026, 04:00 UT – 12 April 2026, 03:59 UT is predicted at a normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on 12 April 2026, 04:00 UT - 13 April 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 strong for the last 24 hours

The MUF depression on 10 April 2026, 04:00 UT - 11 April 2026, 03:59 UT is predicted at quiet level due to previous of geomagnetic activity.

The MUF depression on 11 April 2026, 04:00 UT - 12 April 2026, 03:59 UT is predicted at quiet level due to previous of geomagnetic activity.

The MUF depression on 12 April 2026, 04:00 UT - 13 April 2026, 03:59 UT is predicted at quiet level due to previous of geomagnetic activity.

The SWF on 10 April 2026, 04:00 UT – 11 April 2026, 03:59 UT is predicted at quiet level due to the prediction of solar flare.

The SWF on 11 April 2026, 04:00 UT - 12 April 2026, 03:59 UT is predicted at quiet level due to the prediction of solar flare.

The SWF on 12 April 2026, 04:00 UT - 13 April 2026, 03:59 UT is predicted at quiet level due to the prediction of solar flare.

Satellites

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

High level of electron flux is expected for 10 April 2026 04:00UT - 11 April 2026 03:59UT.
Low level of electron flux is expected for 11 April 2026 04:00UT - 12 April 2026 03:59UT.
Low level of electron flux is expected for 12 April 2026 04:00UT - 13 April 2026 03:59UT.

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

Based on today's conditions, the flux of high-energy protons for 
april 10th, 2026 04:00 UT - april 11th, 2026 03:59 UT is predicted to be quiet,
april 11th, 2026 04:00 UT - april 12th, 2026 03:59 UT is predicted to be quiet,
april 12th, 2026 04:00 UT - april 13th, 2026 03:59 UT is predicted to be quiet,