2.4.1 spase://CNES/NumericalData/CDPP-AMDA/MEX/MARSIS/mex-marsis-ele MEX - MARSIS - total electron content 2018-07-31T07:40:33Z 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. spase://CNES/Person/CDPP-AMDA/W.Kofman DataProducer spase://CNES/Person/CDPP-AMDA/C.Grima DataProducer MARSIS TEC documentation ftp://psa.esac.esa.int/pub/mirror/MARS-EXPRESS/MARSIS/MEX-M-MARSIS-5-DDR-SS-TEC-V1.0/DOCUMENT/MARSIS_EAICD_TEC.PDF spase://SMWG/Repository/CDPP/AMDA Online Open CDPP/AMDA HAPI Server https://amda.irap.omp.eu/service/hapi mex-marsis-ele Web Service to this product using the HAPI interface. CSV 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 https://amda.cdpp.eu/help/policy.html . Please acknowledge the Data Providers. spase://SMWG/Repository/CDPP/AMDA Online Open CDPP/AMDA Web application https://amda.cdpp.eu Access to Data via CDPP/AMDA Web application. CSV VOTable CDF PNG 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 https://amda.cdpp.eu/help/policy.html . Please acknowledge the Data Providers. PSA MEX-M-MARSIS-5-DDR-SS-TEC-[EXT1]-V1.0 L5 spase://CNES/Instrument/CDPP-AMDA/MEX/MARSIS Waves 2005-06-19T04:03:28Z 2007-09-30T23:41:11Z PT1S PT10S Mars 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 tec mex_marsis_tec Total electron content derived from the ionosphere distortion correction phys.density;phys.electron m-2 TimeSeries Other quality flag mex_marsis_tecflag TimeSeries Other