Detailed Information

Solar Activity

Solar activity in the past 24 hours was eruptive.

Three C-class flares occurred in the past 24 hours. The strongest was a C8.9 flare that peaked at 21:55 UT from an unknown region. No solar radio bursts were detected, but four CMEs were observed during this period. The west-directed CME had a speed of 368 km/s and an angular width of 10°, while the east-directed CME had a speed of 206 km/s and an angular width of 26°. The latest SDO/HMI intensitygram data show two active regions (NOAA 14482 and 14489), while the latest BBSO H-alpha data show two H-alpha plages (NOAA 14487 and 14488) on the solar disk. The GONG Calibrated Farside Map indicates that two active regions are expected to appear on the solar limb between 16 and 18 July.

Based on today's conditions, solar activity for the next 24 hours is predicted to remain eruptive, with a maximum C-class flare forecast by the Random Forest model.

Geomagnetic Activity

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

The solar wind speed decrease from 491 km/s to 338 km/s, north-south component of interplanetary magnetic field fluctuate between -7.3 nT and 12.3 nT. There was geoeffective coronal hole at western equator, while the others at south pole, eastern equator, north pole and western equator were not geoeffective. CME on 15 July 2026 06:48 UT was mainly errupted toward west with speed of 338 km/s and angular width of 20°. 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

The ionosphere was in quiet conditions for the last 24 hours.

There was no depression of foF2 lower than 30% of its median value. There was no increment of fmin more than 30% of its median values. The Spread-F did not occur for the last 24 hours. The Sporadic-E occurred in the night and daytime with foEs values exceeding foF2 several times for 15 minutes. The S4 index values (condition of ionospheric scintillation ) were less than 0.5, and the maximum TEC index value was at 55.08, both over Pontianak, for the last 24 hours.

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

Navigation

The error of the single-frequency GPS positioning for the last 24 hours was at a normal level, based on ionospheric scintillation and TEC variation.

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

HF Radio Communication

Maximum Usable Frequency (MUF) Depression was in quiet condition, and the Short Wave Fadeout (SWF) was in quiet for the last 24 hours.

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 quiet based on predicted solar flare classes.

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 in the past 24 hours was quiet.

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