Detailed Information

Solar Activity

Solar activity over the past 24 hours was eruptive.

A total of four C-class flares were observed, with no M-class or X-class flares. The most significant event was a C2.8 flare from NOAA 14557, peaking at 13:56 UT. No solar radio bursts were reported in association with this activity. Coronal mass ejections (CMEs) totaling four events were observed. One CME from the west limb had a speed of 730 kilometers per second and an angular width of 22 degrees. Another CME from the east limb showed a speed of 317 kilometers per second with an angular width of 16 degrees.

On the visible disk, three active regions were identified by SDO/HMI: NOAA 14551, NOAA 14557, and NOAA 14560. Additionally, BBSO observed four H-alpha plages corresponding to NOAA 14553, NOAA 14554, NOAA 14556, and NOAA 14559. Looking beyond the visible disk, one farside region is expected to return to the visible disk between 21 October and 23 October.

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

Geomagnetic Activity

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

The solar wind speed increased from 317 km/s to 403 km/s, and the north-south component of the interplanetary magnetic field fluctuated between -3.2 nT and 4.6 nT. The coronal hole was not geoeffective. CME on 20 October 2026 at 14:24 UT mainly erupted toward the northwest with a speed of 730 km/s and an angular width of 22°. The CME was geoeffective and is likely to have not impact on next 24 hours.

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

Ionospheric Activity

Ionosphere was in Quiet level for the last 24 hours.

There was no depression of foF2 lower than 30% of its median values.There was increment of fmin more than 30% of its median values for 120 minutes. The Spread-F occured for 420 minutes. The Sporadic E layer occured in the night and daytime for 450 minutes with foEs value exceeded the foF2 for 30 minutes. The S4 index values (condition of ionospheric scintillation) was on Severe (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 for the next 24 hours is predicted to be Quiet.

Navigation

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

The probability of error positioning for the next 24 hours is predicted to be Medium, 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 for the next 24 hours is predicted to be Quiet, based on prediction of geomagnetic activity.

The SWF for the next 24 hours is predicted to be Quiet, based on prediction of Solar activity.
 

Satellites

The electron flux was on low 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 the last 24 hours.

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