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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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Data
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