This volume contains data from the Cassini Orbiter Ion and Neutral Mass Spectrometer (INMS) level 1A extracted data volume set. It includes all the data from both the high and the low sensitivity counters annotated with selected spacecraft position, spacecraft attitude and instrument state information available between 2004-183 (1 Jul) and 2011-273 (30 Sep). User's guides describing the analysis of INMS ion data from Titan's ionosphere and neutrals from Titan's neutral atmosphere are provided in the /DOCUMENT/TITAN_ION_UG and /DOCUMENT/TITAN_NEUTRALS_UG subdirectories respectively. A complete description of the design of this volume is given in the INMS archive volumes software interface specification (VOLSIS). An electronic copy of this document is located on this volume in the /DOCUMENT/VOLSIS directory. A complete description of the design of this volume is given in the INMS archive volumes software interface specification (VOLSIS). An electronic copy of this document is located on this volume in the /DOCUMENT/VOLSIS directory.

This volume is intended for the use of scientists and students in the study of the composition and structure of Titan's upper atmosphere and it's interaction with Saturn's magnetospheric plasma. The data may be used for research and publication.

This volume complies with Planetary Data System (PDS) standards, Version 3.6, described in Jet Propulsion Laboratory (JPL) document JPL D-7669.

An HTML interface has been created for this volume allowing easy access to the data and other files using a web browser. Entry into the HTML interface is through the file 'AAREADME.HTM' located in the root directory.

The disk is organized into a hierarchical directory structure. The disk contains 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.

All science data are located under the DATA directory. The INDEX directory contains a listing of all of the data products included on this volume. The CATALOG directory contains PDS documentation describing the mission, spacecraft, instrument, and data set. These include:

  MISSION.CAT                   Cassini-Huygens mission description
  INSTHOST.CAT                  Cassini orbiter spacecraft description
  INST.CAT                      INMS instrument description
  CO_INMS_L1A_DS.CAT            INMS L1A data set description
  CO_INMS_REF.CAT               INMS reference information
  PERSON.CAT                    INMS personnel contact information
  PROJREF.CAT                   Cassini Project reference information

Note that updated versions of these files may be available from PDS-PPI (http://www.igpp.ucla.edu/cgi-bin/ditdos?dataset=CO-SSA-INMS-3-L1A-U-V1.0).

Additional information on volume organization is given in the VOLSIS (described above), and in section the 'Volume Contents' below.

The data files on this volume are provided in ASCII comma-separated value (CSV) format. Note that some of the CSV files contained on this volume may be larger than the maximum limit imposed by some spreadsheet applications. Caution should be used to insure that the data are handled correctly. Each data file is also accompanied by a detached PDS label file (.LBL extension), an ASCII file containing information describing the data file and data record format.

Catalog files (.CAT extension) are provided in ASCII format. Note, however, that as '.CAT' is a reserved file extension under MS Windows it may be necessary to specify a text editor when opening PDS catalog files.

Document files describing the volume, the data and data-calibration software are included in the volume. These files may be given in MS Word, HTML and ASCII formats.

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. Note that while both label and catalog files are ASCII, some operating systems will not recognize the .LBL and .CAT extensions as ASCII types. It may be necessary to either remap these extensions as ASCII in the system or text browser, or else to open the files from within the text browser.

The Cassini Orbiter INMS L1A data volume set (COINMS_3XXX) includes the following volumes:

  Volume No.    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               This file
|
|- ERRATA.TXT                 Description of known anomalies on this volume
|
|- VOLDESC.CAT                Description of the contents of this volume
|
|- [BROWSE]                   Browse plot image files
|
|- [CALIB]                    Calibration information and data files
|
|- [CATALOG]                  Catalog files describing mission and dataset
|
|- [DATA]                     INMS data products
|
|- [DOCUMENT]                 Electronic documents describing the instrument
|                             and data set
|
|- [INDEX]                    Index files relating to this volume
|

Every effort has been made to ensure that the data and documentation are of the best possible quality. However, mistakes are inevitable. The PPI Node of the PDS will maintain an online list of ERRATA where errors and updates are documented. Should any user of this product find an error on this volume, please report the error to the PPI Node so that the finding can be made public. All users are encouraged to verify the correctness of the data prior to submitting any publications or other work based on these data.

There is a file called ERRATA.TXT found at the root level of this volume which contains a list of known deficiencies or caveats associated with data on this volume at the time this DVD was published. Any changes or errors that are found on this or any COINMS_3XXX volume can be found at the PDS/PPI website (http://www.igpp.ucla.edu/cgi-bin/ditdos?errata=COINMS_3XXX).

If you find an error on this disk, please report the error to the PDS Operator at the PPI Node of the PDS.

  Internet          pds_operator@igpp.ucla.edu
  Telephone         (310) 206-6073
  U.S. Mail         PDS Operator
                    c/o Dr. Raymond Walker
                    UCLA - IGPP
                    Los Angeles, CA 90095-1567

The person most directly responsible for the construction and release of this archive volume is Mr. Steven Joy. He was the PPI Node Data Administrator at the time this disk was created and understands as much about the disk structure and data organization as anyone. Other PPI personnel who may be aware of issues related to this archive volume include Mr. Joseph Mafi, and Dr. Raymond Walker, the PDS/PPI Node manager.

For questions or problems regarding this volume, please contact the PDS/PPI operator:

    Internet            pds_operator@igpp.ucla.edu
    Telephone           (310) 206-6073
    U.S. Mail           PDS Operator
                        c/o Dr. Raymond Walker
                        3845 Slichter Hall
                        UCLA - IGPP
                        Los Angeles, CA 90095-1567

For questions regarding PDS Standards or other archive volumes available from the PDS, please contact PDS Operator at the PDS Central Node (at JPL):

    Internet            pds_operator@jpl.nasa.gov
    Telephone           (818) 354-4321
    U.S. Mail           Planetary Data System, PDS Operator
                        Jet Propulsion Laboratory
                        Mail Stop 202-101
                        4800 Oak Grove Dr.
                        Pasadena, CA 91109-8099

A list of personnel in the Cassini CAPS team that were involved in the production of this volume is given in /CATALOG/PERSON.CAT.

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 above.