PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2017-01-10 NOTE = "AAREADME.TXT describes this volume." END_OBJECT = TEXT END Cassini Orbiter Magnetospheric Imaging Instrument Cassini at Saturn MIMI CHEMS Calibrated Data Archive Planetary Plasma Interactions Discipline Node of the Planetary Data System 1. Introduction This volume contains data from the CASSINI S MIMI CHEMS SENSOR CALIBRATED DATA V1.0 (CO-S-MIMI-4-CHEMS-CALIB-V1.0) data set which contains the calibrated Saturn tour data collected by the CHEMS sensor of the Cassini MIMI instrument. The data cover 2004-01-01 (DOY 001) through 2016-03-20 (DOY 080). A table describing the energy ranges associated with the MIMI channels is provided in the the /CALIBRATION directory. This data and additional documentation is also provided on the MIMI Reference Volume (COMIMI_0000). The latest version of the Reference Volume is available on-line at http://ppi.pds.nasa.gov/. The Cassini Magnetospheric Imaging Instrument (MIMI) Charge Energy Mass Spectrometer (CHEMS) contains a deflection system and an overall field of view of 159 x 4 deg. that is comprised of three distinct energetic particle telescopes each having a field of view of 53 x 4. All telescopes share the same deflection mechanism, but each has its own start and stop microchannel plate (MCP) and its own solid-state detector (SSD). Much of the data returned by CHEMS is separated by telescope. The deflection plate power supply (DPPS) has 32 different voltages that can be applied across the deflection plates. For any single DPPS step, the electrostatic analyzer only transmits incoming ions within a narrow range of energy per charge (a 3% pass band). The CHEMS calibrated data set includes the Pulse Height Analysis (PHA) data collected during the Saturn tour. CHEMS PHA provides a list of individually detected particles, with specific detection parameters for each event, including TOF, energy deposited in the SSD, and telescope number. The energy per charge data for six ion species (H+, He+, H2+, He++, O++, W+) are presented in two forms. (The W+ water ion group includes O+, OH+, H20+ and H30+). One form is a set of tables which are of variable length and use a comma to separate various fields, and the other is a PDF file containing the energy per charge spectrograms and are based on CHEMS PHA data. The original data has been decommutated and decoded by software at the Applied Physics Laboratory (APL) and calibrated and further processed by software at the University of Maryland. This volume complies with Planetary Data System (PDS) standards, Version 3.8, described in Jet Propulsion Laboratory (JPL) document JPL D-7669. The PDS and the Planetary Plasma Interactions (PPI) Node in particular, assume no legal liability for errors on this disk. All users are encouraged to verify the 'correctness' of the data prior to submitting any publications or other work based on these data. Errors on this disk should be reported back to the PPI Node of the PDS through the ERRATA reporting procedures described below. 2. Volume format This volume is organized into a hierarchical directory structure. It complies with both the Universal Disk Format (UDF) and the ISO 9660 (level 2) file system standards in order to accommodate users on a wide variety of platforms. 3. File formats The data files on this volume are provided as ASCII comma-delimited tables (CSV files). Each data file is accompanied by a detached PDS label file (LBL file) which contains information describing the data file and data record format. Browse files on this volume are in Adobe PDF format. Document files describing the volume and data products are included in the volume. PDF/A, and 'clean' HTML versions are provided of all documents. The HTML version contains minimal markup and is provided in fulfillment of the PDS 3 requirement of an ASCII version of all document files. Text files and detached label files contain 80-byte fixed-length ASCII records, with a carriage-return character (ASCII 13) in the 79th byte and a line-feed character (ASCII 10) in the 80th byte. This format allows the files to be read by MacOS, DOS, UNIX and VMS operating systems. 4. Volume contents The files on this volume are organised into one Root directory containing several subdirectories. The following table shows the structure and content of these directories. In the table, directory names are enclosed in square brackets, upper-case letters indicate an actual directory or file name, and lower-case letters indicate the general form of a set of directories or file names. DIRECTORY OR FILE CONTENTS Root | |- AAREADME.TXT Textual description of this volume (this file) | |- ERRATA.TXT Description of known anomalies on this volume | |- VOLDESC.CAT PDS volume descriptor file | |- [BROWSE] Graphical depictions of the data from this data | set. Note that these files are for data search | and characterization not necessarily for | publication. | |- [CALIBRATION] | |- [CATALOG] PDS catalog files describing mission, | spacecraft, instrument, and data | |- [DATA] MIMI science data files. The data are divided | into subdirectories by data type/species | (ttt_sss, where ttt is the type, and sss the | species), and year (yyyy). | |- [DOCUMENT] Documents related to this data set including the | data product and volume Software Interface | Specification (SIS) | |- [INDEX] PDS index files for this volume | 5. Errata Every effort has been made to ensure that the data and documentation are of the best possible quality. However, mistakes are inevitable. All users of these data are encouraged to verify the correctness of the data prior to submitting any publications or other work based on these data. Should any user of this product find an error on this volume, please report the error to the PPI Node PDS Operator through the contact information provided below. The file ERRATA.TXT, found at the root level of this volume, contains a list of known deficiencies or caveats associated with data on this volume. An up-to-date version of this file is maintained online at the PDS/PPI node, and may be obtained through the PPI webpages (http:/ppi.pds.nasa.gov/). 6. Contacts This archive volume was produced at the PDS/PPI Node by Joseph Mafi under the direction of Dr. Steven Joy, the PPI Operations Manager. For questions or problems regarding this volume, please contact the PDS/PPI operator: Internet pds_operator@igpp.ucla.edu Telephone (310) 206-6073 A list of relevant Cassini MIMI personnel team is provided in the personnel catalog file (PERSON.CAT) that is associated with this volume.