Detailed Information

Solar Activity

Solar activity for April 24, 2026, 04:00 UT - April 25, 2026, 03:59 UT was a major flare.
Solar activity for April 25, 2026, 04:00 UT - April 26, 2026, 03:59 UT was active.
Solar activity for April 26, 2026, 04:00 UT - April 27, 2026, 03:59 UT was active.

Flaring activity consisted of 23 C-class flares and 4 M-class flares, with no X-class flares observed in the last 24 hours. The maximum flare event was an M6.0, peaking at 22:57 UT. One Type II radio burst and seven Type III radio bursts were detected, with no Type IV radio bursts. Seven active regions were observed: NOAA 14420, NOAA 14421, NOAA 14423, NOAA 14424, NOAA 14425, NOAA 14426, and NOAA 14427. No H-alpha plages were observed, and no farside regions were detected returning to the Earth-facing disk. No Coronal Mass Ejections (CMEs) were detected in the last 24 hours by CACTUS analysis. A Coronal Hole was observed at latitude 35.0° and longitude -77.0° by SIDC.

Based on today's condition, solar activity for the next 24 hours is predicted to be active, with the Random Forest model forecasting a maximum flare class of M.

Geomagnetic Activity

The geomagnetic activity was at an active level on 24 April 2026 07UT - 25 April 2026 07UT.
The geomagnetic activity was at an active level on 25 April 2026 07UT - 26 April 2026 07UT.
The geomagnetic activity was at a quiet level for the last 24 hours.

The solar wind speed is stable around 410 km/s, the north-south component of the interplanetary magnetic field fluctuates between -13.9 nT and 12.2 nT There were geoeffective coronal holes at the south pole and western equator, while the others at the south pole, eastern equator, and north-east were not geoeffective.

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

Ionospheric Activity

The ionosphere was in minor conditions on 24 April 04:00 UT - 25 April 03:59 UT.
The ionosphere was in quiet conditions on 25 April 04:00 UT - 26 April 03:59 UT.
The ionosphere was in quiet conditions on 26 April 04:00 UT - 27 April 03:59 UT.

There was a depression of foF2 lower than 30% of its median value for 45 minutes, 15 minutes, and 0 minutes in 24-27 April 2026. There was an increment of fmin of more than 30% of its median values for 105 minutes, 30 minutes, and 120 minutes. The Spread-F occurred for 255 minutes, 405 minutes, and 240 minutes in 24-27 April 2026. The Sporadic-E did occur in the night and daytime with foEs values exceeding the foF2 value for 1185, 1140, and 915 minutes. The S4 index values (condition of ionospheric scintillation ) were less than 0.5 (quiet) in 24 April 2026 and 0.5 < s4 < 0.8 (moderate) on 25-26 April 2026. The TEC was less than 120 TECU in the last three days. Both are observed over Pontianak.

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 24 April 04:00 UT - 25 April 03:59 UT was at a normal level.
Based on TEC, the error of the single-frequency GPS positioning on 25 April 04:00 UT - 26 April 03:59 UT was at a normal level.
Based on TEC, the error of the single-frequency GPS positioning on 26 April 04:00 UT - 27 April 03:59 UT 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 a moderate condition, and Short Wave Fadeout (SWF) was at a moderate level on 24 April 04:00 UT - 25 April 03:59 UT.
MUF depression was in quiet condition, and Short Wave Fadeout (SWF) was at a quiet level on 25 April 04:00 UT - 26 April 03:59 UT.
MUF depression was in quiet condition, and Short Wave Fadeout (SWF) was at a quiet level on 26 April 04:00 UT - 27 April 03:59 UT.

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

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

Satellites

The electron flux was at a high level on 24 April 2026 07UT - 25 April 2026 07UT.
The electron flux was at a low level on 25 April 2026 07UT - 26 April 2026 07UT.
The electron flux was at a low level for the last 24 hours.

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

The flux of high-energy protons was quiet during the period April 24, 2026, 04:00 UT - April 25, 2026, 03:59 UT.
The flux of high-energy protons was quiet conditions for April 25, 2026, 04:00 UT - April 26, 2026, 03:59 UT.
The flux of high-energy protons was quiet conditions for April 26, 2026, 04:00 UT - April 27, 2026, 03:59 UT.

Based on today's conditions, the flux of high-energy protons is predicted to be quiet for the next 24 hours.