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Cassini Orbiter
Magnetospheric Imaging Instrument
Cassini at Saturn
MIMI LEMMS Calibrated Data Archive
Planetary Plasma Interactions Discipline Node
of the
Planetary Data System
1. Introduction
This volume contains data from the CASSINI S MIMI LEMMS SENSOR CALIBRATED DATA
V1.0 (CO-S-MIMI-4-LEMMS-CALIB-V1.0) data set which contains the calibrated
Saturn tour data collected by the LEMMS sensor of the Cassini MIMI instrument.
The data cover 2004-01-01 (DOY 001) through 2017-09-15 (DOY 258).
The Cassini Magnetospheric Imaging Instrument (MIMI) Low Energy Magnetospheric
Measurements (LEMMS) sensor uses two oppositely directed telescopes to measure
ions and electrons in the energy range 0.03 to 18 MeV for ions and 0.015 to
0.884 MeV for electrons. LEMMS measures electrons in two ways: the first
method of detection uses magnets to bend low-energy electrons into detectors
and the second uses a stack of detectors capable of separating electrons by
energy discrimination.
The LEMMS calibrated data set includes two types of daily plots -- one
presenting energy-time spectorgrams in units of intensity, and one with plots
of particle pressures. There are also four types of averaged data -- minute
and hourly averages for accumulator rate data and PHA data (ions and
electrons). These data have been created at the Johns Hopkins University
Applied Physics Laboratory by applying various calibrations and averaging.
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/.
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.
|