Earthdata
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Global Navigation Satellite System (GNSS) Ionosphere Vertical Total Electron Content (VTEC) Fluctuation Measurement Product from NASA CDDIS
temporal

Year	File Count
2014	365
2015	381
2016	308
2017	305
2018	277
2019	106
2020	291
2021	311
2022	144
2023	313
2024	319
2025	198

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NASA Official: Doug Newman
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