Detailed Information

Solar Activity

Solar activity was eruptive, with three C-class flares observed. No M-class or X-class flares occurred. The strongest event was a C1.4 flare, peaking at 17:33UT from NOAA 14557. Associated with this, no Type II, Type III, or Type IV solar radio bursts were reported. Six coronal mass ejections were detected. Those originating from the western limb showed a speed of 415 km/s and an angular width of 14 degrees. Meanwhile, events from the eastern limb had a speed of 483 km/s and an angular width of 12 degrees.

On the visible disk, SDO/HMI observations revealed two active regions: NOAA 14557 and NOAA 14560. BBSO H-alpha observations also identified two plages, NOAA 14554 and NOAA 14556. Two farside regions are anticipated to return to the visible disk between October 23 and October 25.
 

Based on today's conditions,
solar activity for 23 oct, 04:00 UT–24 oct, 03:59 UT is predicted to be eruptive,
solar activity for 24 oct, 04:00 UT–25 oct, 03:59 UT is predicted to be eruptive,
solar activity for 25 oct, 04:00 UT–26 oct, 03:59 UT is predicted to be eruptive,
with the Random Forest model.
 

Geomagnetic Activity

The geomagnetic activity was on minor storm level for the last 24 hours.

The solar wind speed decrease from 527 km/s to 371 km/s, north-south component of interplanetary magnetic field fluctuate between -8.3 nT and 6.3 nT. Corona hole at equator was geoeffective, but at northern, south pole, and north pole was not geoeffective.

Active level geomagnetic activity is expected for the next 24 hours.
Quiet level geomagnetic activity is expected for 24 October 2026 04UT - 25 October 2026 04UT.
Quiet level geomagnetic activity is expected for 25 October 2026 04UT - 26 October 2026 04UT.

Ionospheric Activity

Ionosphere was in Quiet level for the last 24 hours.

There was depression of foF2 lower than 30% of its median values for 15 minutes.There was increment of fmin more than 30% of its median values for 120 minutes. The Spread-F occured for 240 minutes. The Sporadic E layer occured in the night and daytime for 480 minutes with foEs value exceeded the foF2 for 75 minutes. The S4 index values (condition of ionospheric scintillation) was on Moderate (S4 < 0.8) level last 24 hours over Agam. The TEC values was on Quiet (VTEC < 125) level last 24 hours over Agam.

The ionosphere activity on October 23rd, 04:00 UT - October 24th, 03:59 UT is predicted to be Minor.
The ionosphere activity on October 24th, 04:00 UT - October 25th, 03:59 UT is predicted to be Minor.
The ionosphere activity on October 25th, 04:00 UT - October 26th, 03:59 UT is predicted to be Quiet.

Navigation

For the last 24 hours, the error of the single frequency GPS positioning was on Slight level.

The probability of error positioning on October 23rd, 04:00 UT - October 24th, 03:59 UT is predicted to be Slight, based on scintillation and TEC variations.
The probability of error positioning on October 24th, 04:00 UT - October 25th, 03:59 UT is predicted to be Slight, based on scintillation and TEC variations.
The probability of error positioning on October 25th, 04:00 UT - October 26th, 03:59 UT is predicted to be Slight, based on scintillation and TEC variations.
 

HF Radio Communication

The MUF(Maximum Usable Frequency) depression was in Quiet condition and the SWF (Short Wave Fadeout) was in Moderate for the last 24 hours.

The MUF depression on October 23rd, 04:00 UT - October 24th, 03:59 UT is predicted to be Moderate, based on prediction of geomagnetic activity.
The MUF depression on October 24th, 04:00 UT - October 25th, 03:59 UT is predicted to be Minor, based on prediction of geomagnetic activity.
The MUF depression on October 25th, 04:00 UT - October 26th, 03:59 UT is predicted to be Quiet, based on prediction of geomagnetic activity.

The SWF on October 23rd, 04:00 UT - October 24th, 03:59 UT is predicted to be Quiet, based on prediction of Solar activity.
The SWF on October 24th, 04:00 UT - October 25th, 03:59 UT is predicted to be Quiet, based on prediction of Solar activity.
The SWF on October 25th, 04:00 UT - October 26th, 03:59 UT is predicted to be Quiet, based on prediction of Solar activity.

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.
Low level of electron flux is expected for 24 October 2026 04UT - 25 October 2026 04UT.
Low level of electron flux is expected for 25 October 2026 04UT - 26 October 2026 04UT.

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

Based on these conditions,
the flux of high-energy proton for 23 oct, 04:00 UT–24 oct, 03:59 UT is predicted to be quiet,
the flux of high-energy proton for 24 oct, 04:00 UT–25 oct, 03:59 UT is predicted to be quiet,
the flux of high-energy proton for 25 oct, 04:00 UT–26 oct, 03:59 UT is predicted to be quiet.