Bangkok: GISTDA has identified a G3 level magnetic field in Thailand, which is influencing satellite and high-frequency radio wave operations.
According to Thai News Agency, data from GISTDA sensors indicated the presence of a moderate geomagnetic storm (G3) in the region. This disturbance was attributed to a Coronal Mass Ejection (CME) emitted from the AR4100 sunspot on May 31, 2025.
The local K index in Thailand, measuring the Earth's magnetic field, reached a value of 7 out of a possible 9, indicating moderately severe disturbances. Such disturbances have the potential to temporarily reduce the accuracy of satellite navigation signals, interfere with high-frequency radio signals, and impact satellite system operations.
In the context of 2025 being the peak of Solar Cycle 25, frequent and intense solar activities, including sunspots and eruptions, are expected to persist. GISTDA has committed to closely monitoring space conditions, reporting updates, and issuing warnings if any events arise that could affect Thailand in the future.
In a prior warning, GISTDA highlighted a G4 geomagnetic storm resulting from a solar flare observed on May 30-31, 2025, in the AR4100 dark spot area. This event released both a solar flare and a substantial CME directed towards Earth. The CME is anticipated to reach Earth on June 1, potentially causing a severe G4 geomagnetic storm, which could impact navigation systems, communication systems, and satellite operations.
The geomagnetic storm is also expected to generate colorful aurora displays in areas near the poles and high latitudes. However, Thailand will not be directly affected by this phenomenon.
Source: Thai News Agency