PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = "2022-12-02 by M. Holmstrom, IRF" RECORD_TYPE = STREAM /* rELEASE_ID = 0001 */ /* rEVISION_ID = 0000 */ OBJECT = DATA_SET DATA_SET_ID = "MEX-M-ASPERA3-5-DDR-IMA-EXT1-V1.0" OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = " MARS EXPRESS ASPERA-3 MOMENTS DDR ION MASS ANALYZER EXT1 V1.0" DATA_SET_COLLECTION_MEMBER_FLG = N START_TIME = 2007-001T04:57:55.468 STOP_TIME = 2007-274T06:09:19.377 DATA_SET_RELEASE_DATE = 2024-04-05 PRODUCER_FULL_NAME = "MATS HOLMSTROM" DETAILED_CATALOG_FLAG = N DATA_OBJECT_TYPE = "SPREADSHEET" ARCHIVE_STATUS = "ARCHIVED - ACCUMULATING" DATA_SET_TERSE_DESC = " This data set contains Mars Express ASPERA-3 Ion Mass Analyzer (IMA) data for the first mission extension (December 1, 2005 - October 31, 2007)." CITATION_DESC = " Holmstrom, M., S. Barabash, M. Persson, MARS EXPRESS ASPERA-3 DDR ION MASS ANALYZER V1.0, MEX-M-ASPERA3-5-DDR-IMA-EXT1-V1.0, ESA Planetary Science Archive (PSA), NASA Planetary Data System (PDS), 2023" ABSTRACT_DESC = " This data set contains Mars Express ASPERA-3 Ion Mass Analyzer (IMA) data for the first mission extension (December 1, 2005 - October 31, 2007)." DATA_SET_DESC = " Overview: ========= The Ion Mass Analyzer (IMA) provides in situ ion measurements in the energy range 0.01 - 40 keV/q for the main ion components H+, He++, He+, O+, with 20-80 amu/q to help satisfy the following scientific objectives: 1. Determine the instantaneous global distributions of plasma and neutral gas near Mars by providing undisturbed solar wind parameters 2. Define the local characteristics of the main plasma regions 3. Complement the ENA images Parameters: =========== All IMA data products have the same format and parameters, and each row (data file record) in the IMA SPREADSHEET data products has seven (7) COLUMN objects (parameters): 1. Start Time - Begin Date/Time in UTC of data samples 2. Stop Time - Ending Date/Time in UTC of data samples 3. Data Type Name - SENSOR or MODE. The SENSOR rows are the IMA science data. The MODE rows contain informational data such Mask indicators, Indexes, and Summations. 4. Data Type Id - Numeric ID indicating SENSOR or MODE. 5. Data Name - Short description for data on that row. 6. Data Unit - Indicates the data unit. 7. Values - These are the actual data values. For this column there are multiple values as indicated by the ITEMS keyword in the label files. For IMA data, there are 3 ITEMS in the SENSOR rows. The MODE data rows contain only one value each with remaining ITEMS indicated as 'missing' with nothing between the commas (value,,...,,). Please note that the data values are formatted for best accuracy and that this is not the accuracy of the IMA instrumentation. Data Products: ============== The Standard Data Products for IMA PSA Level 5 products are: 1. IMA_MOM - Ion Mass Analyzer data Ancillary Data: =============== It is important for ASPERA-3 science studies to know where in space and time the Mars Express spacecraft and ASPERA-3 instruments are located and what objects (Sun, Mars, Earth, Phobos, Deimos) are in the fields of views. The ASPERA-3 view directions for each sensor can be derived using the SPICE kernels and software. The ASPERA-3 Sensor Frames and Geometry Information document (in DOCUMENT directory) provides a code example (in C and FORTRAN) for determining the view directions for the ASPERA-3 sensors. Coordinate System: ================== The ASPERA-3 data are always in the instrument reference frame since data are sampled in situ. The GEOMETRY table contains spacecraft related parameters expressed in the J2000 reference frame, and the ASPERA-3 Sensor Frames and Geometry Information document (in DOCUMENT directory) provides information for determining the ASPERA-3 sensors view directions and transforming to the J2000 reference frame. References: =========== Refer to the ASPERA-3 Experiment to Archive Interface Control Document (EAICD - MEX_ASPERA3_PSA_ICD_V02_00) found in the DOCUMENT directory for more information and detail concerning data set formulation and contents. " CONFIDENCE_LEVEL_NOTE = " Review: ======= These data have been reviewed by the instrument team and are of the highest quality that can be generated at this time. Science results based on these data have been published in several journals (Science, Nature, EGU, etc.). After submission to the PDS, these data successfully completed the peer review process. Data Coverage/Quality: ====================== IMA cannot measure the positive ions at very low energies and are indicated by negative values for the CENTER_ENERGY for the energy steps affected in the IMA_ENERGYn.TAB files in the CALIB directory. Data at these energy levels should be ignored and not used. Also included in the IMA_ENERGYn.TAB files are the elevation angles per polar angle index and per energy step. Elevation angles than -50.0 (degrees) indicate invalid data that should also be excluded from data analysis. Limitations: ============ The ASPERA-3 IMA data is complicated and there are many issues to address when analyzing the data. The IMA_CALIBRATION_REPORT.PDF (in the DOCUMENT directory) addresses many of these issues and it is strongly advised to contact the ASPERA-3 IMA team in guidance in analyzing the IMA data. ** Please contact the ASPERA-3 IMA Team for more information before using IMA data: Mats Holmstrom - matsh@irf.se Stas Barabash - stas@irf.se Andrei Fedorov - Andrei.Fedorov@cesr.fr " END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_TARGET TARGET_NAME = "MARS" /*tARGET_TYPE = "PLANET" */ END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = "SOLAR WIND" /*tARGET_TYPE = "PLASMA CLOUD" */ END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = "MEX" INSTRUMENT_ID = "ASPERA-3" 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 = "BARABASHETAL2004" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END