PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = " 2006-03-30, Robert A. Johnson (U. IOWA), initial; 2011-08-29, L. Granroth (UIowa), modification for EXT3" RECORD_TYPE = STREAM OBJECT = DATA_SET DATA_SET_ID = "MEX-M-MARSIS-3-RDR-AIS-EXT3-V1.0" OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "MARS EXPRESS MARS MARSIS RDR ACTIVE IONOSPHERE SOUNDING EXT3 V1.0" DATA_SET_COLLECTION_MEMBER_FLG = "N" DATA_OBJECT_TYPE = TABLE ARCHIVE_STATUS = "ACCUMULATING" START_TIME = 2010-001T05:17:49.000 STOP_TIME = "NULL" DATA_SET_RELEASE_DATE = 2011-08-29 PRODUCER_FULL_NAME = "RICHARD L. HUFF" DETAILED_CATALOG_FLAG = "N" DATA_SET_TERSE_DESC = " This data set contains the Mars Express MARSIS Active Ionospheric Sounder data from orbit 7690 through the end of the third extended mission. The data are fully calibrated in units of spectral density." ABSTRACT_DESC = " The Mars Express MARSIS Active Ionospheric Sounder (AIS) full resolution data set includes all spectral information calibrated in units of spectral density for the Mars Express third extended mission, EXT3. The data set consists of a transmit frequency followed by a time series of spectral density measurements of the received power. Browse products contain a spectrogram overview plot and individual ionograms for each sounding activity." CITATION_DESC = "Huff, R.L., L.J. Granroth, and D.D. Morgan, MARS EXPRESS M MARSIS ACTIVE IONOSPHERIC SOUNDER, MEX- M-MARSIS-RDR-AIS-EXT3-V1.0, NASA Planetary Data System, 2011." CONFIDENCE_LEVEL_NOTE = "Corrupted data have been flagged in data files where they occurred. The label file for each data product contains an entry to flag this condition." DATA_SET_DESC = " Data Set Overview ================= The Mars Express Mars Advanced Radar for Subsurface and Active Ionospheric Sounding (MARSIS) data set includes all spectral information calibrated in units of spectral density for the Active Ionospheric Sounder over the third extended Mars Express mission. This data set includes calibrated values for each transmit event and the corresponding temporal data for each frequency channel. Parameters ========== This data set comprises the electric field spectral densities obtained via the electric dipole antenna sensor. Processing ========== Data in this data set were processed by the use of a number of software programs. These programs re-assembled and de-compressed the raw telemetry data. These raw values were then calibrated into physical units: power received by the electric antenna. The data products were calibrated using the best calibration tables and algorithms available at the time of data archiving. Should a significant improvement in calibration become available, an erratum will be noted in the erratum section. Later versions of the products may contain better calibrations. Data ==== The AIS calibrated full resolution data set includes several binary tables of wave spectra as a function of time from each of the various transmit events. Each table will contain fixed- length records including columns for time, transmit frequency, and spectral densities from the temporal measurements. The number of transmit frequencies is constant at 160 frequencies per frame. Ancillary Data ============== No Ancillary data are provided. Coordinate System ================= The data in this data set are measurements of wave electric fields measured by the MARSIS electric sensors. These fields are presented as detected by the sensors and are not rotated into any other coordinate system. If desired the SPICE kernels can be used with the SPICE toolkit to convert from the spacecraft frame to virtually any frame which may be of use in analyzing these data. However, for many purposes, the wave amplitudes are extremely useful and may be entirely adequate with no coordinate transformations at all. Software ======== Sample code is provided with these data which demonstrates how to read these files in order to build a set of time-ordered wave spectra. The sample code and algorithms are found in the SOFTWARE directory. Confidence Level Overview ========================= This data set contains all active ionospheric calibrated data for the Mars Express MARSIS for the interval described above. Every effort has been made to ensure that all data returned to Iowa from the spacecraft is included and that the calibration is accurate. Review ====== The MARSIS active ionospheric sounder data will be reviewed internally by the Mars Express MARSIS team prior to release to the PDS. The data set will also be peer reviewed by the PDS. Data Coverage and Quality ========================= All data in the stated interval are included to the best of our knowledge and attempts to determine completeness. In general, the instrument was operated only briefly during early cruise phase for the purpose of Antenna deployment and periodic instrument health. During this time, flight restrictions precluded any transmit events and hence no science data. Beginning in June of 2005 commissioning of the instrument commenced more-or-less continuously for about a month. During this period instrument gain settings and transmit frequencies were optimized for maximum signal-to-noise ratios as well as avoidance of interference generated by the spacecraft and by other instruments. Limitations =========== One measurement quality issue deals with the data compression algorithm used by the MARSIS onboard processor, which generates values of zero when the measured AIS values should be small but non-zero." END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_TARGET TARGET_NAME = MARS END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = MEX INSTRUMENT_ID = MARSIS END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_MISSION MISSION_NAME = "MARS EXPRESS" END_OBJECT = DATA_SET_MISSION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "N/A" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END