Detailed Information

Solar Activity

Solar activity for July 17th, 2026, 04:00 UT - July 18th, 2026, 03:59 UT was eruptive.
Solar activity for July 18th, 2026, 04:00 UT - July 19th, 2026, 03:59 UT was eruptive.
Solar activity for July 19th, 2026, 04:00 UT - July 20th, 2026, 03:59 UT was eruptive.

There were 2 C-class flares observed in the last 24 hours. The maximum flare class was C1.8 from the unknown region peaked at 19:11 UT. There was one type III solar radio burst occurred in the last 24 hours. There were 6 west-directed CME events in the last 24 hours, with the highest has median velocity of 1194 km/s with an angular width of 12 degrees. The latest SDO/HMI Intensitygram data shows 3 active regions (NOAA 14489, NOAA 14491, and NOAA 14492) and the latest BBSO H-Alpha data shows 1 H-Alpha plage (NOAA 14490). No farside regions are currently returning to the visible disk, though regions are due to return between 20 July and 22 July. 

Based on today's condition, solar activity for the next 24 hours is predicted to be active, with maximum flare class prediction of M from the Random Forest model.

Geomagnetic Activity

The geomagnetic activity was at quiet level on 17 July 2026 07UT - 18 July 2026 07UT.
The geomagnetic activity was at quiet level on 18 July 2026 07UT - 19 July 2026 07UT.
The geomagnetic activity was on quiet level for the last 24 hours.

The solar wind speed stable around 307 km/s, north-south component of interplanetary magnetic field fluctuate between -2.8 nT and 3.9 nT There was geoeffective coronal hole at eastern equator, while the others at south-west, north pole, north-east and south-east were not geoeffective. CME on 19 July 2026 18:24 UT was mainly errupted toward north-west with speed of 350 km/s and angular width of 16°. 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 during the past 72 hours could not be evaluated due to the unavailability of data.

The S4 index values (condition of ionospheric scintillation) were below 0.5 (quiet), and TEC was less than 120 (quiet) over the last three days.

Ionospheric activity over the next 24 hours is predicted to be quiet.
 

Navigation

Based on TEC, the error of the single-frequency GPS positioning on July 17th, 2026, 04:00 UT - July 18th, 03:59 UT was at a normal level. 
Based on TEC, the error of the single-frequency GPS positioning on July 18th, 2026, 04:00 UT - July 19th, 03:59 UT was at a normal level. 
Based on TEC, the error of the single-frequency GPS positioning on July 19th, 2026, 04:00 UT - July 20th, 03:59 UT was at a normal level.

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

HF Radio Communication

MUF depression and Short Wave Fadeout (SWF) couldn't be evaluated due to the unavailability of data in the past 72 hours.

The MUF depression in the next 24 hours is predicted at a quiet level due to the previous geomagnetic activity.
The SWF for the next 24 hours is predicted to be minor due to the solar flare forecast.

Satellites

The electron flux was at high level on 17 July 2026 07UT - 18 July 2026 07UT.
The electron flux was at high level on 18 July 2026 07UT - 19 July 2026 07UT.
The electron flux was on high level for the last 24 hours.

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

The flux of high-energy proton was quiet on July 17th, 2026, 04:00 UT - July 18th, 2026 03.59 UT.
The flux of high-energy proton was quiet on July 18th, 2026, 04:00 UT - July 19th, 2026 03.59 UT.
The flux of high-energy proton was quiet on July 19th, 2026, 04:00 UT - July 20th, 2026 03.59 UT.

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