mex-marsis-ele.xml
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<?xml version="1.0" encoding="UTF-8"?>
<Spase xmlns="http://www.spase-group.org/data/schema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.spase-group.org/data/schema http://amda.irap.omp.eu/public/schemas/spase-2_3_1.xsd">
<Version>2.3.1</Version>
<NumericalData>
<ResourceID>spase://CNES/NumericalData/CDPP-AMDA/MEX/MARSIS/mex-marsis-ele</ResourceID>
<ResourceHeader>
<ResourceName>total electron content</ResourceName>
<ReleaseDate>2015-10-15T10:14:00</ReleaseDate>
<Description>The level 5 TEC data are derived following a method described in
details by Mouginot et al. Planetary Space Science, V56, 2008.
The correction method consists in finding the three parameters [ a1 ; a2 ; a3 ]
defining the signal distortion phase Δφ induced by the ionosphere.
In the time domain, the ionosphere distortion generates a delay and a spreading
of the radar pulse. It is clearly visible on MARSIS radargram without correction.
A by-product of the ionospheric correction is the TEC, that can be easily obtained
from the [ a1 ; a2 ; a3 ] parameters. [ a1 ; a2 ; a3 ] are
investigated in ordrer to get Δφ with the best SNR As initial conditions for this
optimization, we use the parameters fitting with a simplified Gaussian
density-profile of the ionosphere.
Then the optimization is done by using the following constraints:
* A constraint on the vertical position of the surface echo estimated with the digital elevation model MOLA.
* A constraint on the SNR. The signal amplitude must be maximal after correction.
</Description>
<Contact>
<PersonID>spase://CNES/Person/W.Kofman</PersonID>
<Role>DataProducer</Role>
</Contact>
<Contact>
<PersonID>spase://CNES/Person/C.Grima</PersonID>
<Role>DataProducer</Role>
</Contact>
<InformationURL>
<Name>MARSIS TEC documentation</Name>
<URL>ftp://psa.esac.esa.int/pub/mirror/MARS-EXPRESS/MARSIS/MEX-M-MARSIS-5-DDR-SS-TEC-V1.0/DOCUMENT/MARSIS_EAICD_TEC.PDF</URL>
</InformationURL>
</ResourceHeader>
<AccessInformation>
<RepositoryID>spase://SMWG/Repository/CNES/CDPP-AMDA</RepositoryID>
<Availability>Online</Availability>
<AccessRights>Open</AccessRights>
<AccessURL>
<URL>http://amda.cdpp.eu</URL>
</AccessURL>
<Format>NetCDF</Format>
</AccessInformation>
<ProviderName>PSA</ProviderName>
<ProviderResourceName>MEX-M-MARSIS-5-DDR-SS-TEC-[EXT1]-V1.0</ProviderResourceName>
<ProviderProcessingLevel>L5</ProviderProcessingLevel>
<InstrumentID>spase://CNES/Instrument/CDPP-AMDA/MEX/MARSIS</InstrumentID>
<MeasurementType>Waves</MeasurementType>
<TemporalDescription>
<TimeSpan>
<StartDate>2005-06-19T04:03:28Z</StartDate>
<StopDate>2007-09-30T23:41:11Z</StopDate>
</TimeSpan>
<CadenceMin>PT1S</CadenceMin>
<CadenceMax>PT10S</CadenceMax>
</TemporalDescription>
<ObservedRegion>Mars</ObservedRegion>
<Caveats>Data Quality Description :
* -1: percentage of low SNR data not available
* 0: no low SNR data
* 1: less than 25% low SNR data
* 2: less than 50% low SNR data
* 3: less than 75% low SNR data
* 4: more than 75% low SNR data
</Caveats>
<Parameter>
<Name>tec</Name>
<ParameterKey>mex_marsis_tec</ParameterKey>
<Description>Total electron content derived from the ionosphere
distortion correction</Description>
<Ucd>phys.density;phys.electron</Ucd>
<Units>m-2</Units>
<RenderingHints>
<DisplayType>TimeSeries</DisplayType>
</RenderingHints>
<Support>
<SupportQuantity>Other</SupportQuantity>
</Support>
</Parameter>
<Parameter>
<Name>quality flag</Name>
<ParameterKey>mex_marsis_tecflag</ParameterKey>
<Description/>
<Ucd/>
<Units/>
<RenderingHints>
<DisplayType>TimeSeries</DisplayType>
</RenderingHints>
<Support>
<SupportQuantity>Other</SupportQuantity>
</Support>
</Parameter>
</NumericalData>
</Spase>