Detailed Information

Solar Activity

Solar activity for 2 April 2026, 04:00 UT- 3 April 2026, 03:59 UT was in active.
Solar activity for 3 April 2026, 04:00 UT- 4 April 2026, 03:59 UT was in active.
Solar activity for 4 April 2026, 04:00 UT- 5 April 2026, 03:59 UT was in active.
Solar activity for 5 April 2026, 04:00 UT- 6 April 2026, 03:59 UT was in eruptive.

Eleven C-class flares were observed, with no M-class or X-class flares reported. The most significant event was a C2.8 flare from NOAA 14409, peaking at 23:47UT. Associated with this activity, four type III solar radio bursts were detected, with no type II or type IV radio bursts observed. Additionally, no coronal mass ejections were recorded. On the visible disk, SDO/HMI instruments observed seven active regions, specifically NOAA 14403, NOAA 14404, NOAA 14405, NOAA 14406, NOAA 14408, NOAA 14409, dan NOAA 14412. BBSO H-alpha observations identified two plage, NOAA 14407 and NOAA 14411. Looking beyond the visible disk, no 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 the next 24 hours is predicted to be eruptive.

Geomagnetic Activity

The geomagnetic activity was at minor storm level on 02 April 2026 04UT - 03 April 2026 04UT.
The geomagnetic activity was at moderate storm level on 03 April 2026 04UT - 04 April 2026 04UT.
The geomagnetic activity was at active level on 04 April 2026 04UT - 05 April 2026 04UT.
The geomagnetic activity was on quiet level for the last 24 hours.

The solar wind speed decrease from 677 km/s to 516 km/s, north-south component of interplanetary magnetic field fluctuate between -4.8 nT and 4.1 nT. There was geoeffective coronal hole at western equator, while the others at north-west, south-east, eastern equator and north-east were not geoeffective. No coronal mass ejections were recorded in the last 24 hours.

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

Ionospheric Activity

Ionosfer was in minor conditions on 2 April 04:00 UT - 3 April 03:59 UT.
Ionosfer was in quiet conditions on 3 April 04:00 UT - 4 April 03:59 UT.
Ionosfer was in quiet conditions on 4 April 04:00 UT - 5 April 03:59 UT.
Ionosfer was in quiet conditions in the last 24 hours.

There was a depression of foF2 lower than 30% of its median value for 120 minutes in 3-4 April. There were increment of fmin more than 30% of its median values for 60 minutes, 75 minutes, 120 minutes, and 75 minutes in the last four days, respectively. The Spread-F were occurred for 120 in 3-4 April. The Sporadic-E were occurred in the night and daytime with foEs value exceeding the foF2 value for 765 minutes, 1080 minutes, 765 minutes, and 510 minutes in the last four days, respectively. The S4 index values (condition of ionospheric scintillation ) were lower than 0.5 (quiet) and TEC were less than 120 (quiet) in the last four days.

The ionosphere activity in the next 24 hours is predicted to be quiet.

Navigation

Based on TEC, the error of the single-frequency GPS positioning on 2 April 04:00 UT - 3 April 03:59 UT could not be evaluated.
Based on TEC, the error of the single-frequency GPS positioning on 3 April 04:00 UT - 4 April 03:59 UT was at a normal level.
Based on TEC, the error of the single-frequency GPS positioning on 4 April 04:00 UT - 5 April 03:59 UT was at a normal level.
Based on TEC, the error of the single-frequency GPS positioning in the last 24 hours was at a normal level.

Based on ionospheric scintillation and TEC variation, the probability of error positioning in the next 24 hours is predicted at a normal level.

HF Radio Communication

MUF depression was in moderate condition and Short Wave Fadeout (SWF) was in moderate level on 2 April 04:00 UT - 3 April 03:59 UT.
MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in moderate level on 3 April 04:00 UT - 4 April 03:59 UT.
MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in moderate level on 4 April 04:00 UT - 5 April 03:59 UT.
MUF depression was in quiet condition and Short Wave Fadeout (SWF) was moderate in the last 24 hours.

The MUF depression in the next 24 hours is predicted on a quiet level, due to previous of geomagnetic activity.

The SWF for the next 24 hours is predicted at a quiet level due to the prediction of the solar flare.

Satellites

The electron flux was at low level on 02 April 2026 04UT - 03 April 2026 04UT.
The electron flux was at high level on 03 April 2026 04UT - 04 April 2026 04UT.
The electron flux was at high level on 04 April 2026 04UT - 05 April 2026 04UT.
The electron flux was on high level for the last 24 hours.

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

The flux of high-energy proton for 2 April 2026, 04:00 UT- 3 April 2026, 03:59 UT was in event in progress level.
The flux of high-energy proton for 3 April 2026, 04:00 UT- 4 April 2026, 03:59 UT was in event in progress level.
The flux of high-energy proton for 4 April 2026, 04:00 UT- 5 April 2026, 03:59 UT was in event in progress level.
The flux of high-energy proton for 5 April 2026, 04:00 UT- 6 April 2026, 03:59 UT was in quiet level.

Based on solar activity condition, the flux of high-energy protons for the next 24 hours is predicted to be quiet.