Detailed Information

Solar Activity

Solar activity over the past 24 hours was a Major Flare. 

Twelve solar flares were observed, comprising ten C-class events, one M-class event, and one X-class event. The most significant flare was an X1.1-class event originating from NOAA 14479, peaking at 20:50UT. Associated with this activity, two solar radio bursts were detected, including one Type III burst and one Type IV burst. Four coronal mass ejection (CME) events were recorded, with one westward-directed CME showing a speed of 580 km/s and an angular width of 152 degrees, while another westward-directed CME showed a speed of 515 km/s and an angular width of 16 degrees. On the visible disk, five active regions were identified by SDO/HMI instrumentation: NOAA 14475, NOAA 14477, NOAA 14478, NOAA 14479, and NOAA 14480. Additionally, three H-alpha plages were observed by BBSO, corresponding to NOAA 14472, NOAA 14473, and NOAA 14476. Looking beyond the visible disk, one active region is described as due to return between July 01 and July 03. 

The solar activity for the next 24 hours is predicted to remain at a Major Flare, based on Random Forest model prediction of an X-class maximum flare.

Geomagnetic Activity

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

The solar wind speed increase from 368 km/s and 508 km/s. The north-south component of interplanetary magnetic field fluctuate between -2.2 nT and 3.1 nT. Corona hole at south-east was not geoeffective. CME on 30 June 2026 21:00 UT was mainly errupted toward north-west with speed of 634 km/s and angular width of 138°. The CME was not geoeffective and is likely to have not impact on next 24 hours.

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

Ionospheric Activity

Evaluation of Ionosphere conditions cannot be delivered within 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 S4 index values (condition of ionospheric scintillation) was quiet (S4 < 0.5) and TEC index was quiet (TEC max = 64.41).

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

Navigation

Based on TEC and scintilation, the error of the single frequency GPS positioning for the last 24 hours was in normal level.

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

HF Radio Communication

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

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

The SWF for next 24 hours is predicted in strong 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. 
Based on these conditions, the proton flux is predicted to remain quiet for the next 24 hours.