Detailed Information

Solar Activity

Solar activity was in eruptive the last 24 hours.

Eight C-class flares were observed, with no M-class or X-class flares reported. The most significant event was a C8.1 flare from NOAA 14409, peaking at 19:58UT. Associated with this activity, three type III solar radio bursts were detected, with no type II or type IV radio bursts observed. Additionally, six coronal mass ejections were recorded. Those from the western limb had a median speed of 316 kilometers per second and an angular width of 14 degrees, while those from the eastern limb had a median speed of 606 kilometers per second and an angular width of 8 degrees. On the visible disk, SDO/HMI instruments observed nine active regions, specifically NOAA 14399, NOAA 14401, NOAA 14402, NOAA 14403, NOAA 14404, NOAA 14405, NOAA 14406, NOAA 14408, and NOAA 14409. BBSO H-alpha observations identified one plage, NOAA 14407. Looking beyond the visible disk, one active region is expected to return to the visible disk between April 02 and April 04 2026.

Based on today's condition,

solar activity for 2 April 2026, 04:00 UT-3 April 2026, 03:59 UT is predicted to be eruptive;

solar activity for 3 April 2026, 04:00 UT-4 April 2026, 03:59 UT is predicted to be eruptive;

solar activity for 4 April 2026, 04:00 UT-5 April 2026, 03:59 UT is predicted to be eruptive;

solar activity for 5 April 2026, 04:00 UT-6 April 2026, 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 increase from 369 km/s and 509 km/s, north-south component of interplanetary magnetic field fluctuate between -4.6 nT and 4.7 nT. There was geoeffective coronal hole at central equator, while the others at south-west and north-east were not geoeffective. CME on 01 April 2026 12:00 UT was mainly errupted toward west with speed of 316 km/s and angular width of 14°. The CME was geoeffective and is likely to have not impact until next 4 days.

Active level geomagnetic activity is expected for the next 24 hours.
Quiet level geomagnetic activity is expected for 03 April 2026 04UT - 04 April 2026 04UT.
Quiet level geomagnetic activity is expected for 04 April 2026 04UT - 05 April 2026 04UT.
Quiet level geomagnetic activity is expected for 05 April 2026 04UT - 06 April 2026 04UT.

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 no increment of fmin more than 30% of its median values. There was a Spread-F layer for 15 minutes and the Sporadic-E for 405 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 2 April 2026, 04:00 UT - 3 April 2026, 03:59 UT is predicted to be quiet.

The ionosphere activity on 3 April 2026, 04:00 UT - 4 April 2026, 03:59 UT is predicted to be minor.

The ionosphere activity on 4 April 2026, 04:00 UT - 5 April 2026, 03:59 UT is predicted to be quiet.

The ionosphere activity on 5 April 2026, 04:00 UT - 6 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 2 April 2026, 04:00 UT - 3 April 2026, 03:59 UT is predicted at a normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on 3 April 2026, 04:00 UT – 4 April 2026, 03:59 UT is predicted at a normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on 4 April 2026, 04:00 UT - 5 April 2026, 03:59 UT is predicted at a normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning on 5 April 2026, 04:00 UT - 6 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 quiet for the last 24 hours

The MUF depression on 2 April 2026, 04:00 UT - 3 April 2026, 03:59 UT is predicted at quiet level due to previous of geomagnetic activity.

The MUF depression on 3 April 2026, 04:00 UT - 4 April 2026, 03:59 UT is predicted at minor level due to previous of geomagnetic activity.

The MUF depression on 4 April 2026, 04:00 UT - 5 April 2026, 03:59 UT is predicted at quiet level due to previous of geomagnetic activity.

The MUF depression on 5 April 2026, 04:00 UT - 6 April 2026, 03:59 UT is predicted at quiet level due to previous of geomagnetic activity.

The SWF on 2 April 2026, 04:00 UT – 3 April 2026, 03:59 UT is predicted at quiet level due to the prediction of solar flare.

The SWF on 3 April 2026, 04:00 UT - 4 April 2026, 03:59 UT is predicted at quiet level due to the prediction of solar flare.

The SWF on 4 April 2026, 04:00 UT - 5 April 2026, 03:59 UT is predicted at quiet level due to the prediction of solar flare.

The SWF on 5 April 2026, 04:00 UT - 6 April 2026, 03:59 UT is predicted at quiet 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 the next 24 hours.
High level of electron flux is expected for 03 April 2026 04UT - 04 April 2026 04UT
High level of electron flux is expected for 04 April 2026 04UT - 05 April 2026 04UT
High level of electron flux is expected for 05 April 2026 04UT - 06 April 2026 04UT

The flux of high-energy proton was in event in progress level for the last 24 hours.

Based on solar activity condition,

The flux of high-energy protons for 2 April 2026, 04:00 UT-3 April 2026, 03:59 UT is predicted to be event in progress;

The flux of high-energy protons for 3 April 2026, 04:00 UT-4 April 2026, 03:59 UT is predicted to be quiet;

The flux of high-energy protons for 4 April 2026, 04:00 UT-5 April 2026, 03:59 UT is predicted to be quiet;

The flux of high-energy protons for 5 April 2026, 04:00 UT-6 April 2026, 03:59 UT is predicted to be quiet.