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Ionospheric Correction  Noveltis Auxiliary Data

Coverage:  Mediterranean Sea and NE Atlantic - 30-70N, 15W-40E 

Time Period: Whole Cryosat-2 Mission to date

Auxiliary Data Used: -    TEC maps from SPECTRE database (from GPS network data),  Ionosphere model IRI95
 

Method:
The TEC maps extend from -15°E to 40°E and from 30°N to 70°N. The space resolution of the SPECTRE-TEC maps is 2.5° x 2.5° which provides a longitudinal resolution twice better than GIM products. However the best improvement concerns the time resolution, which is 30 seconds for SPECTRE products while it is 2 hours for GIM products. Increase of space and time resolutions allows estimating the ionospheric perturbations at smaller space and time scales. 
The reliable TEC maps produced by NOVELTIS will be used to generate a new Cryosat ionospheric correction. However, the TEC maps have to be processed in order to generate ionospheric correction products. Indeed, TEC maps are the estimation of the integral of the electron density from ground/ocean level to GPS satellites altitude (20,200km). Therefore ionosphere correction for satellite altimeters is computed by applying a scale factor to assess the integral of the electron density from ground/ocean level to the satellite altimeter. The scale factor is estimated by using the IRI95 ionosphere model.

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