Satellite navigation can fail not only during dramatic space weather events, but also when the ionosphere develops sharp regional structures that standard correction models fail to resolve. This study shows that steep longitudinal gradients in total electron content (TEC) can appear within a narrow band over Asia, creating positioning errors for standard point positioning. It also finds that storm-time ionospheric irregularities can either amplify or reduce precise positioning errors, depending on how electric fields reshape plasma motion after sunset. By linking these regional structures to specific positioning outcomes, the research offers a clearer picture of when and why GNSS accuracy breaks down--and how warning systems could become more useful for real-world users.Why Satellite Positioning Can Suddenly Go Wrong
April 09, 2026
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Satellite navigation can fail not only during dramatic space weather events, but also when the ionosphere develops sharp regional structures that standard correction models fail to resolve. This study shows that steep longitudinal gradients in total electron content (TEC) can appear within a narrow band over Asia, creating positioning errors for standard point positioning. It also finds that storm-time ionospheric irregularities can either amplify or reduce precise positioning errors, depending on how electric fields reshape plasma motion after sunset. By linking these regional structures to specific positioning outcomes, the research offers a clearer picture of when and why GNSS accuracy breaks down--and how warning systems could become more useful for real-world users.
