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Over 90 GNSS ground stations distributed around the Pacific Ring of Fire monitor four major constellations to produce near-real-time total electron content (TEC) time series. Developed at NASA's Jet Propulsion Laboratory (JPL), the GUARDIAN system provides validated 5-second sampled data for detecting ionospheric perturbations. This dataset is managed by NASA's CDDIS and is available in BIN, ISO, and HTML file formats.
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