Detailed Information

Solar Activity

Solar activity for 22 May, 04:00 UT–23 May, 03:59 UT was active.
solar activity for 23 May, 04:00 UT–24 May, 03:59 UT was eruptive.
solar activity for 24 May, 04:00 UT–25 May, 03:59 UT was eruptive.

Solar activity was eruptive over the past 24 hours. 
One C-class flare, specifically a C1.2 event peaking at 18:37UT, was observed from NOAA 14447.  Two Type III solar radio bursts and five coronal mass ejections were observed, with events originating from the west limb having a median speed of 744 km/s and an angular width of 10 degrees, and events from the east limb having a median speed of 919 km/s and an angular width of 10 degrees. On the visible disk, six active regions were identified by SDO/HMI imagery, NOAA 14441, NOAA 14443, NOAA 14444, NOAA 14445, NOAA 14446, and NOAA 14447. Three H-Alpha plages were observed by BBSO, i.e NOAA 14439, NOAA 14440, and NOAA 14442. From farside, one region is expected to return to the visible disk between 25 May and 27 May. 

For the next 24 hours, solar activity is predicted to be active.

Geomagnetic Activity

The geomagnetic activity was at quiet level on 22 May 2026 07UT - 23 May 2026 07UT.
The geomagnetic activity was at quiet level on 23 May 2026 07UT - 24 May 2026 07UT.
The geomagnetic activity was on quiet level for the last 24 hours.

The solar wind speed increase from 298 km/s and 350 km/s, north-south component of interplanetary magnetic field fluctuate between -3.1 nT and 4.1 nT. There were geoeffective coronal holes at south pole and central equator, while the others at eastern equator, north-east and south pole were not geoeffective. CME on 24 May 2026 09:12 UT was mainly errupted toward north-west with speed of 488 km/s and angular width of 70°. The CME was geoeffective and is likely to have not impact on next 24 hours.

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

Ionospheric Activity

Ionosphere activity for 22 May 04.00 UT - 23 May 03.59 UT was on minor level.
Ionosphere activity for 23 May 04.00 UT - 24 May 03.59 UT was on quiet level.
Ionosphere activity was on quiet level for the last 24 hours.

There was depression of foF2 lower than 30% of its median value for 30 minutes and 15 minutes for the first 48 hours. There was 45 minutes increment of fmin more than 30% of its median values at the first 24 hours. The Spread-F was detected for 120 minutes and 450 minutes for the first 48 hours. There was 105, 735, and 1110 minutes Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times in the last 72 hours. The S4 index values (condition of ionospheric scintillation ) was less than 0.5 (quiet) and the maximum TEC index value was less than 125 (quiet) for the last 72 hours, both over Pontianak.

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

Navigation

Based on TEC and scintillation,
the error of the single-frequency GPS positioning for 22 May 04.00 UT - 23 May 03.59 UT was at a normal level.
the error of the single-frequency GPS positioning for 23 May 04.00 UT - 24 May 03.59 UT was at a normal level.
the error of the single-frequency GPS positioning for the last 24 hours was at a normal level.

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

HF Radio Communication

MUF depression was in minor level and Short Wave Fadeout (SWF)  was in moderate level for 22 May 04.00 UT - 23 May 03.59 UT.
MUF depression was in quiet level and Short Wave Fadeout (SWF) was in quiet level for 23 May 04.00 UT - 24 May 03.59 UT.
MUF depression was in quiet level and Short Wave Fadeout (SWF) was in quiet level for the last 24 hours.

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

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

Satellites

The electron flux was at high level on 22 May 2026 07UT - 23 May 2026 07UT.
The electron flux was at high level on 23 May 2026 07UT - 24 May 2026 07UT.
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 22 May, 04:00 UT–23 May, 03:59 UT was quiet,
The flux of high-energy proton for 23 May, 04:00 UT–24 May, 03:59 UT was quiet,
The flux of high-energy proton for 24 May, 04:00 UT–25 May, 03:59 UT was quiet.

Based on current conditions, quiet proton flux levels are expected to continue for the next 24 hours.