Detailed Information

Solar Activity

Solar activity was eruptive in the last 24 hours.    

One C-class flare was observed, specifically a C1.2 flare originating from NOAA 14419 and peaking at 00:53 UT. No M-class or X-class flares were observed. Associated with this activity, two Type III radio bursts were detected. No Type II or Type IV radio bursts were detected. Seven coronal mass ejections were observed. Those propagating to the west exhibited a median speed of 694 km/s with an angular width of 56 degrees, while those propagating to the east showed a median speed of 422 km/s with an angular width of 16 degrees.

On the visible disk, three active regions were identified by SDO/HMI: NOAA 14415, NOAA 14416, and NOAA 14419. Additionally, two H-alpha plages were observed by BBSO, corresponding to NOAA 14414 and NOAA 14418. Looking to the farside, three regions are anticipated to return to the visible disk between April 16 and April 18. For the next 24 hours, solar activity is forecast to be active, with the Random Forest model predicting a maximum flare class of M.

Geomagnetic Activity

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

The solar wind speed decrease from 419 km/s to 340 km/s, north-south component of interplanetary magnetic field stable around 0.4 nT. Coronal holes at eastern equator, south pole and south-east were not geoeffective. CME on 15 April 2026 12:24 UT was mainly errupted toward south-west with speed of 390 km/s and angular width of 12°. The CME was geoeffective and is likely to have not impact on next 24 hours.

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

Ionospheric Activity

Ionosphere was disturbed on minor level for the last 24 hours.

There was 75 minutes depression of foF2 lower than 30% of its median value. There was noincrement of fmin more than 30% of its median values. The Spread-F was detected for 465 minutes for the last 24 hours. There was 17 hours and 30 minutes Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for several times. The S4 index values (condition of ionospheric scintillation ) was between 0.5 - 0.8 and the maximum TEC index value was at 71.79, both over Pontianak.

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

Navigation

The error of the single frequency GPS positioning for the last 24 hours was in slight level, based on ionospheric scintilation and TEC variation.

Based on ionospheric scintilation and TEC variation, the probability of error positioning for the next 24 hours is predicted at a normal level.

HF Radio Communication

MUF depression was in moderate level and Short Wave Fadeout (SWF) was in quiet level for the last 24 hours.

The MUF depression for the next 24 hours is predicted on quiet level, due to previous of geomagnetic activity.

The SWF for the next 24 hours is predicted in minor level due to the prediction of solar flare.

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.

The 10 MeV proton flux remained at quiet levels over the past 24 hours. These quiet conditions are expected to persist for the next 24 hours.