SPACE WEATHER INFORMATION AND FORECAST SERVICESS

Center for Space Research
The National Research and Innovation Agency
BRIN - Indonesia

2026 Oct 30

Geomagnet

Quiet

Ionosphere

Moderate

Forecast

Geomagnet

Quiet

Ionosphere

Quiet

Issued : 2026 October 31 0800 UTC
Forecast Valid For 24 Hours

ESSENTIAL INFORMATION FOR SPACE WEATHER COMMUNITIES

HF Radio Communication

MUF Depression

Shortwave Fadeout / Radio Blackout

Application

NAVIGATION

Error Positioning

SATELLITES

High Energy Proton

High Energy Electron

Detailed Information

Solar Activity

Solar activity over the past 24 hours was quiet. 
No C-class, M-class, or X-class flares were observed. Consequently, no Type II, Type III, or Type IV solar radio bursts were detected. Three coronal mass ejections were observed. One originated from the western limb with a speed of 190 km/s and an angular width of 50 degrees. Another originated from the eastern limb with a speed of 321 km/s and an angular width of 22 degrees. 
On the visible disk, two active regions, NOAA 14563 and NOAA 14564, were identified by SDO/HMI observations. Additionally, one H-alpha plage, NOAA 14562, was observed by BBSO. One region is anticipated to return to the visible disk between October 30 and November 01. 

Based on todya's condition,
Solar activity for October 30th, 2026 04:00 UT - October 31th, 2026 03:59 UT is predicted to be quiet.
Solar activity for October 31th, 2026 04:00 UT - November 1st, 2026 03:59 UT is predicted to be quiet.
Solar activity for November 1st, 2026 04:00 UT - November 2nd, 2026 03:59 UT is predicted to be quiet.

Geomagnetic Activity

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

The solar wind speed decrease from 430 km/s to 360 km/s. The north-south component of interplanetary magnetic field stable around 0.5 nT. Corona holes at east equator, northern, and southern were not geoeffective, while at west equator was geoeffective. CME on 29 October 2026 10:36 UT was mainly errupted toward west with speed of 190 km/s and angular width of 50°. The CME was geoeffective and is likely an impact over the next 3 days.

Quiet level geomagnetic activity is expected for the next 24 hours.
Quiet level geomagnetic activity is expected for 31 October 2026 04UT - 01 November 2026 04UT.
Active level geomagnetic activity is expected for 01 November 2026 04UT - 02 November 2026 04UT.

Ionospheric Activity

Ionosphere was in disturbed on Moderate level for the last 24 hours.

There was depression of foF2 lower than 30% of its median values for  195 minutes.There was no increment of fmin more than 30% of its median values. The Spread-F occured  for  60 minutes. The Sporadic E layer occured in the night and daytime  for  615 minutes with no foEs value exceeded the foF2. The S4 index values (condition of ionospheric scintillation) was on Quiet (S4 < 0.5) 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 30th, 04:00 UT - October 31st, 03:59 UT is predicted to be Quiet.
The ionosphere activity on October 31st, 04:00 UT - November 1st, 03:59 UT is predicted to be Quiet.
The ionosphere activity on November 1st, 04:00 UT - November 2nd, 03:59 UT is predicted to be Quiet.

Navigation

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

The probability of error positioning on October 30th, 04:00 UT - October 31st, 03:59 UT is predicted to be Normal, based on scintillation and TEC variations.
The probability of error positioning on October 31st, 04:00 UT - November 1st, 03:59 UT is predicted to be Normal, based on scintillation and TEC variations.
The probability of error positioning on November 1st, 04:00 UT - November 2nd, 03:59 UT is predicted to be Normal, based on scintillation and TEC variations.

HF Radio Communication

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

The MUF depression on October 30th, 04:00 UT - October 31st, 03:59 UT is predicted to be Quiet, based on prediction of geomagnetic activity.
The MUF depression on October 31st, 04:00 UT - November 1st, 03:59 UT is predicted to be Quiet, based on prediction of geomagnetic activity.
The MUF depression on November 1st, 04:00 UT - November 2nd, 03:59 UT is predicted to be Quiet, based on prediction of geomagnetic activity.

The SWF on October 30th, 04:00 UT - October 31st, 03:59 UT is predicted to be Quiet, based on prediction of Solar activity.
The SWF on October 31st, 04:00 UT - November 1st, 03:59 UT is predicted to be Quiet, based on prediction of Solar activity.
The SWF on November 1st, 04:00 UT - November 2nd, 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.

Low level of electron flux is expected for the next 24 hours.
Low level of electron flux is expected for 31 October 2026 04UT - 01 November 2026 04UT.
Low level of electron flux is expected for 01 November 2026 04UT - 02 November 2026 04UT.
 

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

Based on these conditions, 
The proton flux is expected to be quiet for October 30th, 2026 04:00 UT - October 31th, 2026 03:59 UT,
The proton flux is expected to be quiet for October 31th, 2026 04:00 UT - November 1st, 2026 03:59 UT.
The proton flux is expected to be quiet for November 1st, 2026 04:00 UT - November 2nd, 2026 03:59 UT.