Detailed Information

Solar Activity

Solar activity over the past 24 hours was observed to be major flare. This period saw a total of 16 solar flares, comprising 10 C-class flares, 5 M-class flares, and 1 X-class flare. The strongest event was an X2.4 flare originating from NOAA 14419, which peaked at 01:07 UT. Associated with this flare activity, six Type III radio bursts were detected, while no Type II or Type IV radio bursts were reported. Additionally, six coronal mass ejections were observed. Notable among these were a western-limb CME with a speed of 1242 kilometers per second and an angular width of 14 degrees, and an eastern-limb CME traveling at 527 kilometers per second with an angular width of 100 degrees.

On the visible disk, SDO/HMI instruments identified four active regions: NOAA 14419, NOAA 14420, NOAA 14421, and NOAA 14422. No H-alpha plages were observed by BBSO. Looking beyond the visible disk, one farside region is described as due to return between April 24 and April 26.

Based on predictions from the Random Forest model, solar activity for :
April 24th, 2026 04:00 UT - April 25th, 2026 03:59 UT is predicted to be active.
April 25th, 2026 04:00 UT - April 26th, 2026 03:59 UT is predicted to be active.
April 26th, 2026 04:00 UT - April 27th, 2026 03:59 UT is predicted to be active.

Geomagnetic Activity

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

The solar wind speed decrease from 548 km/s to 440 km/s, north-south component of interplanetary magnetic field stable around 0.9 nT. There were geoeffective coronal holes at central equator, while the others at south-east and eastern equator were not geoeffective. CME on 23 April 2026 04:28 UT was mainly errupted toward south-west with speed of 243 km/s and angular width of 16°. The CME was geoeffective and is likely to have not impact until next 3 days.

Quiet level geomagnetic activity is expected for 24 April 2026 04:00UT - 25 April 2026 03:59UT.
Quiet level geomagnetic activity is expected for 25 April 2026 04:00UT - 26 April 2026 03:59UT.
Quiet level geomagnetic activity is expected for 26 April 2026 04:00UT - 27 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 an increment of fmin more than 30% of its median values for 45 minutes. There was a Spread-F layer for 255 minutes and the Sporadic-E for 1020 minutes in the night and daytime with foEs value exceeding the foF2 value. The S4 index values (condition of ionospheric scintillation) was on quiet level (S4<0,5) 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 24 April 2026, 04:00 UT - 25 April 2026, 03:59 UT is predicted to be quiet.

The ionosphere activity on 25 April 2026, 04:00 UT - 26 April 2026, 03:59 UT is predicted to be quiet.

The ionosphere activity on 26 April 2026, 04:00 UT - 27 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 24 April 2026, 04:00 UT - 25 April 2026, 03:59 UT is predicted at a normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on 25 April 2026, 04:00 UT – 26 April 2026, 03:59 UT is predicted at a normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on 26 April 2026, 04:00 UT - 27 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 moderate for the last 24 hours

The MUF depression on 24 April 2026, 04:00 UT - 25 April 2026, 03:59 UT is predicted at quiet level due to previous of geomagnetic activity.

The MUF depression on 25 April 2026, 04:00 UT - 26 April 2026, 03:59 UT is predicted at quiet level due to previous of geomagnetic activity.

The MUF depression on 26 April 2026, 04:00 UT - 27 April 2026, 03:59 UT is predicted at quiet level due to previous of geomagnetic activity.

The SWF on 24 April 2026, 04:00 UT – 25 April 2026, 03:59 UT is predicted at minor level due to the prediction of solar flare.

The SWF on 25 April 2026, 04:00 UT - 26 April 2026, 03:59 UT is predicted at minor level due to the prediction of solar flare.

The SWF on 26 April 2026, 04:00 UT - 27 April 2026, 03:59 UT is predicted at minor level due to the prediction of solar flare.

Satellites

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

High level of electron flux is expected for 24 April 2026 04:00UT - 25 April 2026 03:59UT.
High level of electron flux is expected for 25 April 2026 04:00UT - 26 April 2026 03:59UT.
High level of electron flux is expected for 26 April 2026 04:00UT - 27 April 2026 03:59UT.

The 10 MeV proton flux remained quiet over the past 24 hours. Based on the observed conditions from the preceding 24 hours, the flux of high energy proton for :
April 24th, 2026 04:00 UT - April 25th, 2026 03:59 UT is predicted to be quiet.
April 25th, 2026 04:00 UT - April 26th, 2026 03:59 UT is predicted to be quiet.
April 26th, 2026 04:00 UT - April 27th, 2026 03:59 UT is predicted to be quiet.