Detailed Information

Solar Activity

Solar activity was quiet in the last 24 hours.

There were no flare that occurred in the last 24 hours. There was 1 type III solar radio burst that occurred in the last 24 hours. There were 7 CME events in the last 24 hours. The east-directed CME has the highest median velocity of 756 km/s, with an angular width of 10 degrees, and the west-directed CME has the highest median velocity of 1157 km/s, with an angular width of 12 degrees. No plage in the solar disk, but latest SDO/HMI Intensitygram data shows 11 active regions (NOAA 4062, 4064, 4065, 4066, 4067, 4068, 4069, 4070, 4071, 4072, 4073). Farside data shows 3 regions due to return from 25 Apr to 27 Apr from the east limb of the Solar disk.

Based on today's condition, 
the solar activity for 25 April 2025, 04:00 UT - 26 April 2025, 03:59 UT is predicted to be eruptive.
the solar activity for 26 April 2025, 04:00 UT - 27 April 2025, 03:59 UT is predicted to be eruptive.
the solar activity for 27 April 2025, 04:00 UT - 28 April 2025, 03:59 UT is predicted to be eruptive.

Geomagnetic Activity

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

The solar wind speed stable around 501 km/s, north-south component of interplanetary magnetic field stable around 1.3 nT. There were geoeffective coronal holes at south-west and north-east, while the others at central equator were not geoeffective. CME on 24 April 2025 06:12 UT was mainly errupted toward north-west with speed of 512 km/s and angular width of 80°. The CME was geoeffective and is likely to have not impact until next 3 days.

Active level geomagnetic activity is expected for 25 April 2025 04:00UT - 26 April 2025 03:59UT.
Active level geomagnetic activity is expected for 26 April 2025 04:00UT - 27 April 2025 03:59UT.
Active level geomagnetic activity is expected for 27 April 2025 04:00UT - 28 April 2025 03:59UT.

Ionospheric Activity

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

There was no depression of foF2 lower than 30% of its median value. There was no increment of fmin more than 30% of its median values. The Spread-F occurred in the last 24 hours for 105 minutes. The Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for 60 minutes.The S4 index values (condition of ionospheric scintillation) was in quiet condition with S4 index value was less than 0.5 (S4<0.5)  over Pontianak. The TEC index over Pontianak was at a quiet level (VTEC<125) in the last 24 hours.

The ionosphere activity on 25 April 2025, 04:00 UT - 26 April 2025, 03:59 UT is predicted to be quiet.

The ionosphere activity on 26 April 2025, 04:00 UT - 27 April 2025, 03:59 UT is predicted to be minor.

The ionosphere activity on 27 April 2025, 04:00 UT - 28 April 2025, 03:59 UT is predicted to be minor.

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 25 April 2025, 04:00 UT - 26 April 2025, 03:59 UT is predicted at a normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on 26 April 2025, 04:00 UT – 27 April 2025, 03:59 UT is predicted at a normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on 27 April 2025, 04:00 UT - 28 April 2025, 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 for the last 24 hours.

The MUF depression on 25 April 2025, 04:00 UT - 26 April 2025, 03:59 UT is predicted at quiet level due to previous of geomagnetic activity.

The MUF depression on 26 April 2025, 04:00 UT - 27 April 2025, 03:59 UT is predicted at minor level due to previous of geomagnetic activity.

The MUF depression on 27 April 2025, 04:00 UT - 28 April 2025, 03:59 UT is predicted at minor level due to previous of geomagnetic activity.

The SWF on 25 April 2025, 04:00 UT - 26 April 2025, 03:59 UT is predicted at quiet level due to the prediction of solar flare.

The SWF on 26 April 2025, 04:00 UT - 27 April 2025, 03:59 UT is predicted at quiet level due to the prediction of solar flare.

The SWF on 27 April 2025, 04:00 UT - 28 April 2025, 03:59 UT is predicted at 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 elektron flux is expected for 25 April 2025 04:00UT - 26 April 2025 03:59UT.
Low level of electron flux is expected for 26 April 2025 04:00UT - 27 April 2025 03:59UT.
Low level of electron flux is expected for 27 April 2025 04:00UT - 28 April 2025 03:59UT.

The flux of high-energy protons in the past 24 hours was quiet. 
Based on today's condition, 
the flux of high-energy protons for 25 April 2025, 04:00 UT - 26 April 2025, 03:59 UT is predicted to be quiet.
the flux of high-energy protons for 26 April 2025, 04:00 UT - 27 April 2025, 03:59 UT is predicted to be quiet.
the flux of high-energy protons for 27 April 2025, 04:00 UT - 28 April 2025, 03:59 UT is predicted to be quiet.