Detailed Information

Solar Activity

Solar activity for :
October 16th, 2026 04:00 UT - October 17th, 2026 03:59 UT was active.
October 17th, 2026 04:00 UT - October 18th, 2026 03:59 UT was eruptive.
October 18th, 2026 04:00 UT - October 19th, 2026 03:59 UT was eruptive.

Solar activity over the past 24 hours was eruptive. Five C-class flares were observed, with no M-class or X-class flares detected. The most significant event was a C3.7 flare from NOAA 14551, peaking at 6:44 UT. No solar radio bursts were reported in association with this activity. Three coronal mass ejections were observed, including one from the west limb with a speed of 601 km/s and an angular width of 34 degrees. On the visible disk, four active regions were identified by SDO/HMI, specifically NOAA 14551, NOAA 14557, NOAA 14559, and NOAA 14560. Additionally, four H-Alpha plages were observed by BBSO, corresponding to NOAA 14553, NOAA 14554, NOAA 14556, and NOAA 14558. One region is due to return to the visible disk between 19 October and 21 October.

Solar activity is predicted to be active for the next 24 hours with a maximum M-class flare.

Geomagnetic Activity

The geomagnetic activity was at quiet level on 16 October 2026 07UT - 17 October 2026 07UT.
The geomagnetic activity was at quiet level on 17 October 2026 07UT - 18 October 2026 07UT.
The geomagnetic activity was on quiet level for the last 24 hours.

The solar wind speed decrease from 527 km/s to 401 km/s, north-south component of interplanetary magnetic field fluctuate between -6.5 nT and 7.7 nT. Corona hole at was not geoeffective. CME on 18 October 2026 05:36 UT was mainly errupted toward north-west with speed of 211 km/s and angular width of 52°. The CME was geoeffective and not likely to have an impact on next 24 hours.

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

Ionospheric Activity

Ionosphere was in Quiet level on October 16th, 04:00 UT - October 17th, 03:59 UT.
Ionosphere was in Quiet level on October 17th, 04:00 UT - October 18th, 03:59 UT.
Ionosphere was in Quiet level on October 18th, 04:00 UT - October 19th, 03:59 UT.

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 15 minutes and 30 minutes on October 16th-17th and October 18th-19th. The Spread-F occured for 120 minutes, 330 minutes, and 315 minutes for 3 consecutive days. The Sporadic E layer occured in the night and daytime for 480 minutes, 285 minutes, and 615 minutes on October 16th-17th, October 17th-18th, and October 18th-19th with foEs value exceeded the foF2 for 120 minutes, 75 minutes, and 75 minutes for 3 consecutive days. The S4 index values (condition of ionospheric scintillation) was on Quiet (S4 < 0.5) level on October 16th-17th, Moderate (S4 < 0.8) level on October 17th-18th, and on Severe (S4 > 0.8) level on October 18th-19th over Agam. The TEC values was on Quiet (VTEC < 125) for 3 consecutive days over Agam.

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

Navigation

On October 16th, 04:00 UT - October 17th, 03:59 UT, the error of the single frequency GPS positioning was on Normal level.
On October 17th, 04:00 UT - October 18th, 03:59 UT, the error of the single frequency GPS positioning was on Slight level.
On October 18th, 04:00 UT - October 19th, 03:59 UT, 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

On October 16th, 04:00 UT - October 17th, 03:59 UT, The MUF(Maximum Usable Frequency) depression was in Quiet condition and the SWF (Short Wave Fadeout) was in Quiet.
On October 17th, 04:00 UT - October 18th, 03:59 UT, The MUF(Maximum Usable Frequency) depression was in Quiet condition and the SWF (Short Wave Fadeout) was in Quiet.
On October 18th, 04:00 UT - October 19th, 03:59 UT, The MUF(Maximum Usable Frequency) depression was in Quiet condition and the SWF (Short Wave Fadeout) was in Minor.

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 at high level on 16 October 2026 07UT - 17 October 2026 07UT.
The electron flux was at low level on 17 October 2026 07UT - 18 October 2026 07UT.
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 proton for :
October 16th, 2026 04:00 UT - October 17th, 2026 03:59 UT was quiet.
October 17th, 2026 04:00 UT - October 18th, 2026 03:59 UT was quiet.
October 18th, 2026 04:00 UT - October 19th, 2026 03:59 UT was quiet.

Based on these conditions, the proton flux is expected to remain quiet for the next 24 hours.