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Illustration of different contributions of the plasmasphere in TEC estimates. Geo-plasma reconstruction sample from CHAMP data (upper panel, left side). TEC estimates from ground based GPS data on March 20, 2002 at 14:30 UT from Northward looking (NL) and Southward looking (SL) satellite links over South-Europe. Corresponding TEC maps (bottom panel left side) in comparison with the differential TEC map (upper panel right side) and the regular TEC map based on a full data set (lower panel right side).
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