Detailed Information

Solar Activity

Eruptive conditions were observed in solar activity over the past 24 hours. Six C-class flares were detected, with no M-class or X-class flares observed. The strongest event was a C9.5 flare peaking at 18:25 UT from NOAA 14436. Associated with this activity, no solar radio bursts were reported. One coronal mass ejection was observed from the east limb with a speed of 538 km/s and a width of 8 degrees; no CMEs were observed from the west limb with measured parameters.

On the visible disk, five SDO/HMI active regions were identified: NOAA 14436, NOAA 14439, NOAA 14441, NOAA 14443, and NOAA 14444. Additionally, two BBSO H-Alpha plages were present: NOAA 14440 and NOAA 14442. Looking ahead, one farside region is expected to return between 22 May and 24 May. 

Based on today's conditions,
solar activity for 22 May, 04:00 UT–23 May, 03:59 UT is predicted to be eruptive,
solar activity for 23 May, 04:00 UT–24 May, 03:59 UT is predicted to be eruptive,
solar activity for 24 May, 04:00 UT–25 May, 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 decreased from 529 km/s to 424 km/s, north-south component of interplanetary magnetic field fluctuate between -4.6 nT and 4.8 nT There were geoeffective coronal holes at western equator and central equator, while the others at eastern equator, south-east, central equator and north pole were not geoeffective.

Quiet level geomagnetic activity is expected for the next 24 hours.
Quiet level geomagnetic activity is expected for 23 May 2026 07UT - 24 May 2026 07UT
Quiet level geomagnetic activity is expected for 24 May 2026 07UT - 25 May 2026 07UT

 

 

 

 

Ionospheric Activity

Ionosfer was in quiet condition for the last 24 hours.

There was no a depression of foF2 lower than 30% of its median value. There was no increment of fmin more than 30% of its median value. There was a Spread-F layer for 45 minutes and the Sporadic-E for 1020 minutes in the night and daytime with foEs value exceeding the foF2 value. The S4 index values (condition of ionospheric scintillation) was less than 0.5 (quiet) and TEC index was less than 125 (quiet).

The ionosphere activity on May 22th, 04:00 UT - May 23th, 03:59 UT is predicted to be quiet.
The ionosphere activity on May 23th, 04:00 UT - May 24th, 03:59 UT is predicted to be quiet.
The ionosphere activity on May 24th, 04:00 UT - May 25th, 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 scintillation and TEC variation, the probability of error positioning on May 22th, 04:00 UT - May 23th, 03:59 UT is predicted at a normal level.
Based on ionospheric scintillation and TEC variation, the probability of error positioning on May 23th, 04:00 UT - May 24th, 03:59 UT is predicted at a normal level.
Based on ionospheric scintillation and TEC variation, the probability of error positioning on May 24th, 04:00 UT - May 25th, 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 level for the last 24 hours.

The MUF depression on May 22th, 04:00 UT - May 23th, 03:59 UT is predicted on a quiet level, based on the LAPAN Time Series method.
The MUF depression on May 23th, 04:00 UT - May 24th, 03:59 UT is predicted on a quiet level, due to previous geomagnetic activity.
The MUF depression on May 24th, 04:00 UT - May 25th, 03:59 UT is predicted on a quiet level, due to previous geomagnetic activity.

The SWF on May 22th, 04:00 UT - May 23th, 03:59 UT is predicted at a quiet level due to the prediction of solar flare.
The SWF on May 23th, 04:00 UT - May 24th, 03:59 UT is predicted at a quiet level due to the prediction of solar flare.
The SWF on May 24th, 04:00 UT - May 25th, 03:59 UT is predicted at a 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 23 May 2026 07UT - 24 May 2026 07UT.
High level of electron flux is expected for 24 May 2026 07UT - 25 May 2026 07UT.

The 10 MeV proton flux remained quiet over the past 24 hours. 

Based on today's condition, 
the flux of high-energy proton for 22 May, 04:00 UT–23 May, 03:59 UT is predicted to be quiet,
the flux of high-energy proton for 23 May, 04:00 UT–24 May, 03:59 UT is predicted to be quiet,
the flux of high-energy proton for 24 May, 04:00 UT–25 May, 03:59 UT is predicted to be quiet.