Detailed Information

Solar Activity

Solar activity was eruptive in the last 24 hours.

There were 2 flares, all of them are C-class flares, in the last 24 hours. The maximum flare class was C3.9, as observed by NOAA 4197, which peaked at 19:22 UT. There was no solar radio burst that occurred in the last 24 hours. There was 1 CME event in the previous 24 hours. The west-directed CME has the highest median velocity of 174 km/s with an angular width of 48 degrees, and no east-directed CMEs are observed. The latest SDO/HMI Intensitygram data shows 10 active regions (NOAA 4191, 4197, 4199, 4200, 4201, 4202, 4205, 4206, 4207, and 4208) and the latest BBSO H-Alpha data shows 4 H-Alpha plages (NOAA 4195, 4196, 4198, and 4204). Based on far-side data, no active region is expected to appear from the east limb of the Solar disk in the next 24 hours.

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

 

Geomagnetic Activity

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

The solar wind speed increased from 379 km/s to 499 km/s, and the north-south component of the interplanetary magnetic field fluctuated between -7.6 nT and 8.9 nT. Coronal holes at the eastern equator, north-west, and north pole were not geoeffective. CME on 01 September 2025 11:00 UT mainly erupted toward the west with a speed of 174 km/s and an angular width of 48°. The CME was geoeffective and is likely to have no impact on the next 24 hours.

Active-level geomagnetic activity is expected over the next 24 hours.

 

 

 

Ionospheric Activity

Ionosphere was in quiet conditions for the last 24 hours.

Evaluation of the foF2 value, the increase in the fmin value, Spread-F, and the Sporadic E-Layer cannot be reported due to problems with the CADI station. The ionospheric scintillation index (S4) over Pontianak is Quiet, with an S4 index value of less than 0.5 in the last 24 hours (S4 <0.5). The TEC index over Pontianak has been Quiet (VTEC <125) for the last 24 hours.

Ionospheric activity for the next 24 is predicted to be quiet.

Navigation

Over the past 24 hours, positioning errors using single-frequency GPS have fluctuated within normal levels based on variations in ionospheric scintillation and TEC.

The positioning error probability for the next 24 hours is predicted to fluctuate at normal levels, based on variations in ionospheric scintillation and TEC.

HF Radio Communication

In the last 24 hours, the Maximum Usable Frequency (MUF) Depression and the Short Wave Fadeout (SWF) cannot be reported.

The MUF Depression for the next is predicted to be at quiet levels based on past geomagnetic activity.

The SWF for the next 24 hours is forecasted at minor based on predicted solar flare classes.

Satellites

The electron flux was at a low level for the last 24 hours.

A low level of electron flux is expected for the next 24 hours.

The flux of high-energy protons was an event in progress for the last 24 hours.

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