Detailed Information

Solar Activity

Solar activity was eruptive for March 27th, 2025 04.00 UT - March 28th, 2026 03.59 UT.
Solar activity was active for March 28th, 2026 04.00 UT - March 29th, 2026 03.59 UT.
Solar activity was major flare for March 29th, 2026 04.00 UT - March 30th, 2026 03.59 UT.

A total of six solar flares were detected, comprising five C-class flares and one X-class flare, while no M-class flares were observed. The most significant event was an X1.4 flare originating from NOAA 14405, which peaked at 03:19 UT. Associated with this flare activity, two Type III solar radio bursts were reported, but no Type II or Type IV radio bursts were observed. Furthermore, no coronal mass ejections were observed during this period.

On the visible disk, nine active regions were identified by SDO/HMI: NOAA 14399, NOAA 14401, NOAA 14402, NOAA 14403, NOAA 14404, NOAA 14405, NOAA 14406, NOAA 14407, and NOAA 14408. Additionally, BBSO H-Alpha observations revealed two plages: NOAA 14397 and NOAA 14398. No farside regions were observed to be returning.

Based on today's condition, solar activity for the next 24 hours is predicted to be eruptive.

Geomagnetic Activity

The geomagnetic activity was at quiet level on 27 March 2026 07UT - 28 March 2026 07UT.
The geomagnetic activity was at active level on 28 March 2026 07UT - 29 March 2026 07UT.
The geomagnetic activity was on quiet level for the last 24 hours.

The solar wind speed increased from 332 km/s to 417 km/s, north-south component of interplanetary magnetic field increased from -7.5 nT to 2.6 nT There were geoeffective coronal holes at western equator, while the others at south pole and eastern equator were not geoeffective.

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

Ionospheric Activity

Ionosfer was in quiet conditions on 27 March 04:00 UT - 28 March 03:59 UT.
Ionosfer was in quiet conditions on 28 March 04:00 UT - 29 March 03:59 UT.
Ionosfer was in quiet conditions on 29 March 04:00 UT - 30 March 03:59 UT.

There was no depression of foF2 lower than 30% of its median value in 27-30 March 2026. There was an increment of fmin more than 30% of its median values for 120 minutes, 90 minutes, and 135 minutes. The Spread-F was occurred for 510 minutes, 285 minutes, and 0 minutes in 27-30 March 2026. The Sporadic-E did occurred in the night and daytime with foEs value exceeding the foF2 value for 660, 600, and 630 minutes. The S4 index values (condition of ionospheric scintillation ) was 0.5 < s4 < 0.8 (moderate) in 27 March 2026 and less than 0.5 (quiet) in 28-29 March 2026. The TEC were 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 minor.

 

Navigation

Based on TEC, the error of the single-frequency GPS positioning on 27 March 04:00 UT - 28 March 03:59 UT was at a slight level.
Based on TEC, the error of the single-frequency GPS positioning on 28 March 04:00 UT - 29 March 03:59 UT was at a normal level.
Based on TEC, the error of the single-frequency GPS positioning on 29 March 04:00 UT - 30 March 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 quiet condition and Short Wave Fadeout (SWF) was in moderate level on 27 March 04:00 UT - 28 March 03:59 UT.
MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in moderate level on 28 March 04:00 UT - 29 March 03:59 UT.
MUF depression was in quiet condition and Short Wave Fadeout (SWF) was in strong level on 29 March 04:00 UT - 30 March 03:59 UT.

The MUF depression in the next 24 hours is predicted on a minor 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 very high level on 27 March 2026 07UT - 28 March 2026 07UT.
The electron flux was at high level on 28 March 2026 07UT - 29 March 2026 07UT.
The electron flux was on high level for the last 24 hours.

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

The flux of high-energy protons was quiet for March 27th, 2025 04.00 UT - March 28th, 2026 03.59 UT.
The flux of high-energy protons was quiet for March 28th, 2026 04.00 UT - March 29th, 2026 03.59 UT.
The flux of high-energy protons was quiet for March 29th, 2026 04.00 UT - March 30th, 2026 03.59 UT.

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