Detailed Information

Solar Activity

Solar activity over the past 24 hours was eruptive. A total of 16 C-class flares were observed, with no M-class or X-class flares. The most significant event was a C5.1 flare peaking at 4:45 UT originating from NOAA 14420. Associated with this activity, one Type III solar radio burst was detected, while no Type II or Type IV radio bursts were observed. One coronal mass ejection was observed, originating from the western limb with a speed of 124 kilometers per second and an angular width of 32 degrees. No east limb CME activity was reported.

On the visible disk, six active regions were identified by SDO/HMI: NOAA 14420, NOAA 14423, NOAA 14424, NOAA 14425, NOAA 14427, and NOAA 14428. BBSO H-Alpha observations indicated one plage, NOAA 14421. Looking beyond the visible disk, one active region is due to return between 30 April and 02 May. 

The overall solar activity for
april 30th, 2026 04:00 UT - mei 1st, 2026 03:59 UT is predicted to be eruptive,
mei 1st, 2026 04:00 UT - mei 2nd, 2026 03:59 UT is predicted to be eruptive,
mei 2nd, 2026 04:00 UT - mei 3rd, 2026 03:59 UT is predicted to be eruptive,
mei 3rd, 2026 04:00 UT - mei 4th, 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 fluctuate between 327 km/s and 391 km/s, north-south component of interplanetary magnetic field fluctuate between -1.6 nT and 3.8 nT There was geoeffective coronal hole at central equator, while the other at north-east were not geoeffective. CME on 29 April 2026 04:48 UT was mainly errupted toward south-west with speed of 124 km/s and angular width of 32°. The CME was geoeffective and is likely to have not impact until next 4 days.

 

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

Quiet level geomagnetic activity is expected for 01 May 2026 07UT - 02 May 2026 07UT

Quiet level geomagnetic activity is expected for 02 May 2026 07UT - 03 May 2026 07UT

Active level geomagnetic activity is expected for 03 May 2026 07UT - 04 May 2026 07UT

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 255 minutes for last 24 hours. There was The Spread-F occurr for 315 minutes for last 24 hours. The Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times for 675 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 on Apr 30, 04:00 UT – May 1st, 03:59 UT is predicted to be quiet.

The ionosphere activity on May 1st, 04:00 UT – May 2nd, 03:59 UT is predicted to be quiet.

The ionosphere activity on May 2nd, 04:00 UT – May 3rd, 03:59 UT is predicted to be quiet.

The ionosphere activity on May 3rd, 04:00 UT – May 4th, 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 Apr 30, 04:00 UT – May 1st, 03:59 UT is predicted at a Normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on May 1st, 04:00 UT – May 2nd, 03:59 UT is predicted at a Normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on May 2nd, 04:00 UT – May 3rd, 03:59 UT is predicted at a normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on May 3rd, 04:00 UT – May 4th, 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 Apr 30, 04:00 UT – May 1st, 03:59 UT is predicted on quiet level, based on geomagnetic activity.

The MUF depression on May 1st, 04:00 UT – May 2nd, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.

The MUF depression on May 2nd, 04:00 UT – May 3rd, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.

The MUF depression on May 3rd, 04:00 UT – May 4th, 03:59 UT is predicted on quiet level, due to previous of geomagnetic activity.

 

The SWF on Apr 30, 04:00 UT – May 1st, 03:59 UT is predicted in Quiet level due to the prediction of solar flare.

The SWF on May 1st, 04:00 UT – May 2nd, 03:59 UT is predicted in quiet level due to the prediction of solar flare.

The SWF on May 2nd, 04:00 UT – May 3rd, 03:59 UT is predicted in quiet level due to the prediction of solar flare.

The SWF on May 3rd, 04:00 UT – May 4th, 03:59 UT is predicted in quiet level due to the prediction of solar flare.

Satellites

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

Low level of electron flux is expected for the next 24 hours.

Low level of electron flux is expected for 01 May 2026 07UT - 02 May 2026 07UT

Low level of electron flux is expected for 02 May 2026 07UT - 03 May 2026 07UT

Low level of electron flux is expected for 03 May 2026 07UT - 04 May 2026 07UT

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 30th, 2026 04:00 UT - mei 1st, 2026 03:59 UT is predicted to be quiet,
mei 1st, 2026 04:00 UT - mei 2nd, 2026 03:59 UT is predicted to be quiet,
mei 2nd, 2026 04:00 UT - mei 3rd, 2026 03:59 UT is predicted to be quiet,
mei 3rd, 2026 04:00 UT - mei 4th, 2026 03:59 UT is predicted to be quiet,