Earthdata
CMR Virtual Directories

Global Navigation Satellite System (GNSS) IGS Predicted Ionosphere Vertical Total Electron Content (VTEC) Grid Product from NASA CDDIS
temporal
2025

Month	File Count
01	62
02	56
03	62
04	60
05	62
06	35
07	62
08	62
09	60
10	62
11	60
12	49

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NASA Official: Doug Newman
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