GPS DELAY TIME AT LOW LATITUDE DURING SEVERE GEOMAGNETIC STORM
Keywords:
TEC, Delay time, Geomagnetic stormAbstract
This study examines the impact of geomagnetic storms on Total Electron Content (TEC) variations and GPS signal delays in low-latitude regions, focusing on the March 24, 2023 (Dst = -163 nT, Kp = 8), and April 24, 2023 (Dst = -213 nT, Kp = 8) geomagnetic storms. Both events, classified as strong geomagnetic storms, significantly affected ionospheric conditions and GNSS signal propagation, particularly in Thailand. The analysis utilized TEC data from three GNSS stations (THCP in Chumphon, THBK in Bangkok, and THCM in Chiang Mai) and revealed substantial fluctuations in TEC and GPS signal delays during the storms. The results indicate that GPS signal delay times increased significantly on the storm days, peaking on March 24 and April 24, before gradually decreasing during the recovery phase. On March 24, 2023, the highest time delay was observed at THBK (10.70 ns), followed by THCP (10.43 ns) and THCM (9.27 ns), whereas on April 24, 2023, the maximum time delay occurred at THCP (9.59 ns), followed by THBK (9.56 ns) and THCM (9.85 ns) respectively.
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