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Coverage: Mediterranean Sea and NE Atlantic - 30-70N, 15W-40E
Time
Period: Whole Cryosat-2 Mission to date
Cryosat-2
Data Products Used: Satellite time and position from ESA L2 Cryosat 2 products
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.
This linked paper provides more details
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