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	149
2012	314
2019	1510
2020	487
2021	529
2022	504
2023	562
2024	211

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NASA Official: Stephen Berrick
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