PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 RELEASE_ID = 0002 REVISION_ID = 0000 OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2014-04-16 NOTE = "N/A" END_OBJECT = TEXT END MARS Express SPICAM LEVEL 1A UV DATA ARCHIVE VOLUME 1. Overview This volume contains Level 1A Ultra Violet (UV) Data Products from observations acquired by the Spectroscopy for the Investigation of Characteristics of the Atmosphere of Mars (SPICAM) instrument on Mars Express (MEX). Level 1A data are level 0A data corrected from the dark charge and the electronic noise. It is also cleaned from erroneous data, cosmic rays damage and saturation. There are two types of SPICAM level 1A data Products for each UV observation collected: Calibrated records (in the DATA directory) and browse images (in the BROWSE directory). For a complete description of each data product, the user is referred to the DOCUMENT/EAICD text on the archive volume. In the DATA directory, data are stored by mission phase (MOCP, MARS) in files with detached label. The MARS directory is then divided into subdirectories corresponding to the different Mars nominal phases defined by the MARS EXPRESS mission planning system (MPS): MOCP_00001_00482 : January 7th to June 6th (orbit 00001 to 00482) MTP001_00483_00582 : June 6th to July 4th (orbit 00483 to 00582) MTP002_00583_00683 : July 4th to August 2th (orbit 00583 to 00683) MTP003_00684_00683 : August 2th to August 30th (orbit 00684 to 00783) ... with : MOCP : Mars Orbit Commissioning Phase MTPnnn : Medium Term Planning nn (nn=001,002,003...) DATA_SET_ID : MEX-M-SPI-2-UVRDR-CLEANED-EXT3-V1.0 ----------- CONTENTS DESCRIPTION : Calibrated ultra violet records collected during the -------------------- MOCP and the different MARS nominal phases. Data products archived in this volume are copies of files released by the SPICAM team. Future Errors and anomalies in the original data and comments about the archive will be noted in the ERRATA.TXT file. 2. Archive Volume - Concept of Delivery Within the Planetary Science Archive (PSA) the archive volume represents an online delivery. This might be not fully compliant with the PDS standard 3.6, but the PSA itself can after the end of mission produce fully compatible archive volumes. Deliveries are based on the concept of a release and a revision. This concept allows the delivery of experiment data without the delivery of all supplementary information, that has already been delivered at the first initial delivery of a fully PDS compatible Archive Volume, containing the VOLDESC.CAT file and all necessary CATALOG, DOCUMENT, INDEX, DATA, etc directories and their content. Some PDS labels used in the SPICAM Standard Data Archive are specifically related to the concept of release and revision. A data set release (or volume release) contains data from a well-defined period of time and is identified by the RELEASE_ID(4 digit number : [0001:9999]. A volume release is made of at least one revision : the initial revision. The initial revision contains the initial data of a data set release and is identified by a REVISION_ID equal to 0000. A following revision of the data set release (updated files, supplementary files, deleted files) would need the value of the REVISION_ID incremented by one. A release catalog object need to be included in the catalog object to fully describe the release. The release object contains all keyword-value pairs that are necessary to identify a revision within a release. The DESCRIPTION part of the DATA_SET_RELEASE object will contain the full history of the release including all previous revisions. Each revision of a release is added in the release catalog object and all necessary information about this revision is given by a REVISION object. 3. File Formats This section provides a brief description of the files and data objects available on the SPICAM archive volume: text files, PDF files, HTML files, PNG files, and PDS objects.A complete description of each file format is available in the DOCUMENT/EAICD text on the archive volume. Text and detached PDS label files have stream or fixed-length record format, and line lengths of must of 80 characters, including a carriage return (ASCII 13) at the end of the record. This allows the files to be read by MS-DOS/ Windows,Unix, and VMS operating systems. Documents that contain formatting and figures that cannot be rendered as ASCII text are provided as HTML,JPEG or PDF files. The hypertext file contains ASCII text plus hypertext markup language (HTML) commands that enable it to be viewed in a Web browser. The PDF (Portable Document Format) file is a proprietary format of Adobe Systems Incorporated a that can be viewed using the free Acrobat Reader software. PNG "browse" files are provided as a way to quickly view the image contents of a SPICAM observation. A PDS detached label provides descriptive information about the associated file. Most of the PDS labels in the SPICAM Standard Data Archive conform to PDS standards [Planetary Science Data Dictionary, 2001; PDS Standards Reference, 2003]. For examples of the PDS labels used with each type of data product, see the DOCUMENT/SA_MEX_ARCH_004_xx.PDF (or .ASC) text on the archive volume. In general, the PDS label is an object-oriented structure consisting of sets of 'keyword = value' declarations; the object to which the label refers is denoted by a statement of the form: ^object = location in which the carat character (^, also called a pointer in this context) indicates where to find the object. In a detached label, the location denotes the name of the file containing the object, along with the starting record or byte number, if there is more than one object in the file. For example: ^HEADER = ("F01.DAT",1) ^IMAGE = ("F01.DAT",1025 ) indicates that the IMAGE object begins at byte 1025 of the file F01.DAT, in the same directory as the detached label file. 4. Science Utilisation The suite of measurements of SPICAM in the various available observation modes is addressing key questions of the atmosphere of Mars, including its present state, the global climate today, and the atmospheric climatic evolution of the planet. Chemistry: Simultaneous measurements of O3 and H2O will allow validating and/or modifying chemistry models, from which will be derived an assessment of the oxidation environment (effect of solar UV, O3, H2O2, O, on minerals and oxidation molecules. Structure/Dynamics/Meteorology: Vertical profiles of density / temperature (20-160km) will provide unique information about the global structure and dynamics of the atmosphere, in particular in the altitude region crucial for aerocapture and aerobraking and a better understanding of meteorological systems. Clouds/Dust/Aerosols: Occultation measurements will allow the detection, measurement and characterization of the physical nature of aerosols, dust particules, and their vertical distribution. Ionosphere/Escape rate: Vertical profiling of daylight aeronomic emissions (H, C, O, CO, CO2+) will allow to adjust a comprehensive model of the ionosphere, from which, ann estimate of escape provesses may be derived (evolution of the atmosphere), and to study the interaction with the solar wind. 5. File Naming Convention Data products provided by the SPICAM team will have the following name: SPIM_YYT_nnnnnAnn_M_vv.FIT where YY 2 letters describing the SPICAM data level (eg. 0A, 1A, 1B, ...) T 1 letter describing the type of data collected (U for UV and R for IR) nnnnn 5 digits for the orbit number Ann sequence number indicating the order that data were collected for the nnnn orbit (A01, A02,...). M 1 letter describing the type operation mode (eg. E:STAR, S:SUN, L:LIMB, N:NADIR, Y:SKY, P:PHOBOS, D:DEIMOS, C:COMET, T:CALIBRATION) vv version number of the file note : For the CRUISE phase, which include the NEV and IC phases, the orbit number is not applicable. The 5 digits will contain the day of the year (2003) of the observation, preceded by the letter N (for the NEV phase) or the letter C (for the IC phase). Examples : SPIM_0AU_0C195A01_Y_04.DAT Sky UV observation on the 13th of July 2003 during the CRUISE phase. 0A level. SPIM_1AU_00017A01_E_01.FIT Star UV observation on orbit 17 during the MARS nominal phase. 1A level. Associated detached label files and browse files follow the same filenaming convention with the .LBL and _QL.PNG extension respectively. 6. Applicable Software The MEX SPICAM READ 1A software provides IDL, C and FORTRAN routines to read UV data files in the MEX SPICAM UV level 1A dataset. For more details see the SOFTINFO.TXT file in the SOFTWARE directory. 7. Volume Contents Files on the SPICAM LEVEL 1A archive volume are organized into a series of subdirectories below the top-level directory. See the xxxxINFO.TXT files in each directory for specific information on the files in the directory. The following table shows the generalized structure and contents of the SPICAM archive volumes. Top-level ROOT | |- AAREADME.TXT The file you are reading | |- ERRATA.TXT Description of known anomalies and errors present | on the volume (No yet implemented). | |- VOLDESC.CAT Description of the contents of the volume in a PDS | format for the PDS Catalog. | | |- [DATA] A directory containing the data + associated label files | | | | | |-[MARS] A directory containing MEX SPI level 1A UV data | | | collected during the MARS nominal phase | | | | | |-[MOCP_00001_00482] | | | | | | | |-- {file(s) *FIT, *.LBL} | | | | | |-[MTP001_00483_00583] | | | | | | | |-- {file(s) *FIT, *.LBL} | | | | | ... | |- [CATALOG] A directory containing information about the data set | | | |- CATINFO.TXT Description of files in this directory | | | |- DATASET.CAT Description of the MEXSPI_1001 data set | | set during the cruise phase | | | |- RELEASE.CAT Release object of the MEXSPI_1001 data set | | | | | |- MISSION.CAT Description of the Mars Express mission | | | |- INSTHOST.CAT Description of the Mars Express spacecraft | | | |- INST.CAT Description of the MEX SPICAM instrument | | | |- PERS.CAT Listing of the people involved in the | | production of this archive volume | |- REFS.CAT List of pertinent references. | | | |- TARGET.CAT Description of the target observed by the | | MEX SPICAM instrument | | | |- SOFTWARE.CAT Description of the software included on the | | volume | |- [INDEX] A directory containing an index of data files. | | | |- INDXINFO.TXT Description of files in this directory. | | | | | |- INDEX.TAB Index of level 1A UV data files in | | the DATA directory | |- INDEX.LBL PDS detached label describing the | | the corresponding *.TAB file | | | |- BROWSE_INDEX.TAB Index of level 1A UV browse files in | | the BROWSE directory | |- BROWSE_INDEX.LBL PDS detached label describing the | | corresponding *.TAB file | | | |- GEO_MARS.TAB Geometry index file providing geometry | | and position information to locate the | | data within the data set | |- GEO_MARS.LBL PDS detached label describing the | | GEO_MARS.TAB file | |- [BROWSE] A directory containing reduced-size, easily viewed versions | | of data products. | | | |- BROWINFO.TXT Description of files in this directory. | | | |-[MARS] A directory containing browse images of MEX SPI level | | | 0A UV data collected during the MARS Mars nominal phase | | | | | |-[MOCP_00001_0482] | | | | | | | |-- {file(s) *PNG, *.LBL} | | | | | |-[MTP001_00483_00583] | | | | | | | |-- {file(s) *PNG, *.LBL} | | | | | ... | |- [DOCUMENT] A directory containing information documents. | | | |- DOCINFO.TXT Description of files in this directory. | | | |- SA_MEX_ARCH_004_xx.PDF The SPICAM EAICD in PDF format | |- SA_MEX_ARCH_004_xx.ASC The SPICAM EAICD in ASC format | | | |- SA_MEX_ARCH_004_xx.LBL PDS detached label that describes | | SA_MEX_ARCH_004_xx.PDF and | | SA_MEX_ARCH_004_xx.ASC | | | |- SPICAM_UVCALIB_DESC.TXT ASCII file describing the calibration | | of the Spicam UV data which are delivered | | in the Spicam UV dataset. | |- SPICAM_UVCALIB_DESC.LBL PDS detached label that describes | | SPICAM_UVCALIB_DESC.TXT | | | |-SPICAM_UVMODE_DESC.TXT- ASCII file describing the different | | operating modes of the UV SPICAM | | spectrometer. | |-SPICAM_UVMODE_DESC.LBL - PDS detached label that describes | | SPICAM_UVMODE_DESC.TXT. | | | |-MEX_ORIENTATION_DESC.TXT - ASCII file informing on the usage of | | the spacecraft orientation on Mars Express. | | | |-MEX_ORIENTATION_DESC.LBL - PDS detached label that describes | | MEX_ORIENTATION_DESC.TXT. | | | |-SPFUM408.PDF - The SPICAM Flight User Manuel in PDF format. | | | |-SPFUM408.LBL - PDS detached label that describes SPFUM408.PDF | | | |-SPICAM_UVT31DOC.PDF - PDF document describing the calibration | | factors of the SPICAM UV spectrometer | | channel. | |-SPICAM_UVT31DOC.LBL - PDS detached label that describes | | SPICAM_UVT31DOC.PDF | |-UV_OPERATION_MODES.PNG - SPICAM UV detector operation modes | | (figure 1 of EAICD) | | | |-UV_OPERATION_MODES.LBL - PDS detached label that describes | | UV_OPERATION_MODES.PNG | | | |-SPICAM_POINTING_014.TXT - This document describes the geometry | | computation. | | | |-SPICAM_POINTING_014.LBL - PDS detached label that describes | | SPICAM_POINTING_014.PNG | | |- [LABEL] A directory containing information label. | | | |-LABINFO.TXT - The file you are reading. | | | |-FUNC_PARAMETERS_ALIGN_TABLE.FMT - This file giving | | informations about functional parameters | | throughout observation. Informations about UV | | CCD time exposure and temperatures values | | during observation for each termistors. | | | |-GEO_BAND1_TABLE.FMT - This table giving geometrical informations | | during observation concerning the line of | | sight emanating from the center of 1st band. | | | |-GEO_BAND2_TABLE.FMT - Same as GEO_BAND1_TABLE for 2nd band. | | | |-GEO_BAND3_TABLE.FMT - Same as GEO_BAND1_TABLE for 3rd band. | | | |-GEO_BAND4_TABLE.FMT - Same as GEO_BAND1_TABLE for 4th band. | | | |-GEO_BAND5_TABLE.FMT - Same as GEO_BAND1_TABLE for 5th band. | | | |-GEO_BAND3_ALIGN_TABLE.FMT - This table giving geometrical | | informations during observation concerning the | | line of sight emanating from the center of CCD. | | | |-GEO_CCDLINE_TABLE.FMT - Same as GEO_BAND3_ALIGN_TABLE. | | | |-GEO_COORDINATES_TABLE.FMT - This table giving geometrical | | coordinates of space craft axis during | | observation. | | | |-GEO_LOSE_TABLE.FMT - This table giving geometrical informations | | during observation associated to the line of | | sight emanating from the UV CCD center, but | | defined by S/C position and Star direction. | | | |-GEO_SPACECRAFT_TABLE.FMT - This table giving geometrical | | informations during observation relative to the | | space-craft. | | | |-GEO_TRANSMATRIX_TABLE.FMT - This table giving transformation | | matrix (2 x 3) to convert coordinates vectors | | from MARSIAU to EMEJ2000. | | | 8. Whom to Contact for Information For questions concerning this data set: Contact Franck MONTMESSIN(Principal Investigator) or GAETAN LACOMBE (Archive Manager) See personnel information in PERS.CAT catalog. 9. Cognizant Persons SPICAM data were provided by F. MONTMESSIN, SPICAM Principal Investigator, with assistance from A. REBERAC, G. LACOMBE, M. CREPEL and N. CHAPRON from LATMOS, IPSL, CNRS, FRANCE.