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Magnetospheric Imaging Instrument
Cassini at Saturn
MIMI CHEMS Calibrated Data Archive
Planetary Plasma Interactions Discipline Node
Planetary Data System
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 2016-12-25 (DOY 360).
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
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
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
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
DIRECTORY OR FILE CONTENTS
|- 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
|- [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
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/).
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
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.