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Data Access

total electron content

ResourceID
spase://CNES/NumericalData/CDPP-AMDA/MEX/MARSIS/mex-marsis-ele

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.

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Details

Version:2.4.1

NumericalData

ResourceID
spase://CNES/NumericalData/CDPP-AMDA/MEX/MARSIS/mex-marsis-ele
ResourceHeader
ResourceName
total electron content
ReleaseDate
2016-01-27 12:27:11Z
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.
Contacts
RolePersonStartDateStopDateNote
1.DataProducerspase://CNES/Person/CDPP-AMDA/W.Kofman
2.DataProducerspase://CNES/Person/CDPP-AMDA/C.Grima
InformationURL
Name
MARSIS TEC documentation
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
AccessInformation
RepositoryID
spase://SMWG/Repository/CDPP/AMDA
Availability
Online
AccessRights
Open
AccessURL
Name
CDPP/AMDA HAPI Server
URL
http://amda.irap.omp.eu/service/hapi
Style
HAPI
Description

Web Service to this product using the HAPI interface.

Format
CSV
Acknowledgement
Thank you for acknowledging the use of AMDA in publications with wording like "Data analysis was performed with the AMDA science analysis system provided by the Centre de Données de la Physique des Plasmas (CDPP) supported by CNRS, CNES, Observatoire de Paris and Université Paul Sabatier, Toulouse".. See the Rules of the road at http://amda.cdpp.eu/help/policy.html. Please acknowledge the Data Providers.
AccessInformation
RepositoryID
spase://SMWG/Repository/CDPP/AMDA
Availability
Online
AccessRights
Open
AccessURL
Name
CDPP/AMDA Web application
URL
http://amda.cdpp.eu
Description

Access to Data via CDPP/AMDA Web application.

Format
CSV
Format
VOTable
Format
CDF
Format
PNG
Acknowledgement
Thank you for acknowledging the use of AMDA in publications with wording like "Data analysis was performed with the AMDA science analysis system provided by the Centre de Données de la Physique des Plasmas (CDPP) supported by CNRS, CNES, Observatoire de Paris and Université Paul Sabatier, Toulouse".. See the Rules of the road at http://amda.cdpp.eu/help/policy.html. Please acknowledge the Data Providers.
ProviderName
PSA
ProviderResourceName
MEX-M-MARSIS-5-DDR-SS-TEC-[EXT1]-V1.0
ProviderProcessingLevel
L5
InstrumentIDs
spase://CNES/Instrument/CDPP-AMDA/MEX/MARSIS
MeasurementType
Waves
TemporalDescription
TimeSpan
StartDate
2005-06-19 04:03:28Z
StopDate
2007-09-30 23:41:11Z
CadenceMin
PT1S
CadenceMax
PT10S
ObservedRegion
Mars
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
Parameter #1
Name
tec
ParameterKey
mex_marsis_tec
Description

Total electron content derived from the ionosphere
distortion correction

UCD
phys.density;phys.electron
Units
m-2
RenderingHints
DisplayType
TimeSeries
Support
SupportQuantity
Other
Parameter #2
Name
quality flag
ParameterKey
mex_marsis_tecflag
RenderingHints
DisplayType
TimeSeries
Support
SupportQuantity
Other