Earthdata
CMR Virtual Directories

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

Year	File Count
2009	1
2010	151
2012	319
2019	1510
2020	487
2021	529
2022	513
2023	563
2024	694
2025	709
2026	469

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NASA Official: Doug Newman
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