Earthdata
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Global Navigation Satellite System (GNSS) Ionosphere Vertical Total Electron Content (VTEC) Analysis Center Product from NASA CDDIS
temporal
1999
01
02

Granule Download	Other Links
gnss_products_ionex_1999_002_whug0020.99i.Z
gnss_products_ionex_1999_002_casg0020.99i.Z
gnss_products_ionex_2099_002_whug0020.99i.Z

NASA Links

NASA Official: Stephen Berrick
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