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MESSENGER
Energetic Particle and Plasma Spectrometer Calibrated Data
MESEPPSCDR_1
Prepared for the Planetary Plasma Interactions Node of the Planetary
Data System
========================================================================
Introduction
========================================================================
This volume contains part of the original data from the MESSENGER Energetic
Particle and Plasma Spectrometer (EPPS) calibrated data volume set.
Note that the EPPS is made up of two instrument subsystems, the Fast Imaging
Plasma Spectrometer (FIPS), and the Energetic Particle Spectrometer (EPS).
This volume includes only the Fast Imaging Plasma Spectrometer (FIPS)
instrument data. Two data sets were delivered within the original data
volume, the FIPS and the EPS.
This volume is intended for the use of scientists and students in the
study of the of the planet Mercury. The data may be used for research
and publication.
========================================================================
Known Issues In Data
========================================================================
Some of the EPS Data Types have unusual or unexpected values users
should be aware of:
- The Time of Flight segment of the instrument is no longer operational.
Early observations (2006) were made in a mode such that rates and fluxes
for all ION and Electron channels are all zero in the early files.
Only FAST and SHAPED rates are nonzero.
-The "Delta" values in SCAN mode data are often negative due to
low count rate statistics.
-Certain PHA events are excluded by default in standard instrument team
analysis as they are of indeterminate analytical value:
* Events for which the multi-hit flag is set.
* Events with a negative RAW Energy.
* Events with Maximum (= 4095) RAW Energy.
Users are advised to discard these events as well unless they have
strong reasons to do otherwise.
See the EPPS CDR SIS document for a more detailed explanation of these
issues.
========================================================================
Volume Format
========================================================================
The volume is organized into a hierarchical directory structure. It is
transferred from the MESSENGER SOC to the Planetary Plasma Interactions
Node via the TCP/IP File Transfer Protocol (FTP) and thus the physical
characteristics of the final storage media are unknown to the SOC.
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 instrument and data set. These include:
MESS_EPPS_INST.CAT EPPS instrument description
MESS_EPPSFIPS_CDR_DS.CAT EPPS FIPS calibrated data set description
Additional information on volume organization is given in the CDR SIS
in the DOCUMENT directory.
========================================================================
File Formats
========================================================================
The data files on this volume are provided in ASCII text format
(extension .TAB). Each data file is also accompanied by a detached PDS
label file (extension .LBL), an ASCII file containing information
describing the data file and data record format.
Catalog files (extension .CAT) are provided in ASCII format.
Document files describing the volume and the data are included in the
DOCUMENT directory.
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.
========================================================================
Volume Contents
========================================================================
Directory Structure and Contents for EPPS CDR Data Archive Volume
The following illustration shows the directory structure overview for
the EPPS CDR Data Archive Volume. This volume contains the EPPS FIPS CDR data
products and any additional files required for the volume to be
compliant with PDS standards. The content of
the volume is expected to be updated with periodic releases according to
the schedule found in the MESSENGER Data Management and Archiving Plan
(DMAP). Revised CDRs (if needed) will also be delivered according to the
same schedule. Revised CDRs will have an incremented version number in
the PDS label.
Data Volume Directory Structure Overview
MESEPPSCDR_1 ❮ROOT❯
________________________|____________________________________________
| | | | |
❮DATA❯ ❮LABEL❯ ❮INDEX❯ ❮CALIB❯ ❮DOCUMENT❯
|
|______________________________________
| | |
| ❮FIPS_HI_SPECTRA❯ ❮FIPS_MED_SPECTRA❯
|_________________________________
| | |
| ❮FIPS_HIRES_PROTON_V❯ |
| |
❮FIPS_SCAN❯ ❮FIPS_PHA❯
Directory Contents:
MESEPPSCDR_1 ❮ROOT❯ Directory
This is the top-level directory of the data volume. The following are
files contained in the root directory.
AAREADME.TXT: (This file) General information file. Provides users with
information about the MESSENGER EPPS data products.
VOLDESC.CAT: PDS file containing the VOLUME object. This gives a high
level description of the contents of the volume. Information includes:
production date, producer name and institution, volume ID, etc.
ERRATA.TXT: Text file for identifying and describing errors and/or
anomalies found in the current volume, and possibly previous volumes of
a set. Any known errors for the associated volume will be documented in
this file. This includes revised CDRs meant to replace CDRs in a
previous PDS delivery.
CHECKSUMS.TXT:
❮DATA❯ Directory
This top level directory contains the CDR data products. Directly
underneath the ❮DATA❯ directory are subdirectories corresponding to the
nine standard data products (described in the EPPS CDR SIS). The
directories are further subdivided into YEAR and MONTH directories.
Each MONTH directory contains the data and label files associated with the
date and data type.
❮LABEL❯ Directory
This subdirectory contains format files (*.FMT) for use with the data files.
❮INDEX❯ Directory
This subdirectory contains the indices for the EPPS CDR data products.
The following files are contained in the index subdirectory.
INDXINFO.TXT - Identifies and describes the function of each file in
the index subdirectory. This includes a description of the structure and
contents of each index table in the subdirectory AND usage notes.
INDEX.TAB - The CDR index file is organized as a table; there is one
entry for each of the data files included in the two EPPS data sets; the
columns contain parameters that describe the data as well as instrument
and spacecraft parameters.
INDEX.LBL - Detached PDS label for INDEX.TAB.
❮CALIBRATION❯ DIRECTORY
This will contain the calibration tables needed to analyze the EPPS data.
CALINFO.TXT Brief description of the directory contents and naming
conventions.
EPPS_FIPS_EDR2CDR: Describes the conversion of EPPS EDRs to CDRs for
the FIPS instrument.
FIPA_E*.TAB: The FIPS energy per charge tables, as described in the
EPPS CDR SIS, located in the DOCUMENT directory of this volume.
❮CATALOG❯ DIRECTORY
This subdirectory contains the catalog object files for the entire
volume. The following files are included in the catalog subdirectory.
CATINFO.TXT: Identifies and describes the function of each file in the
catalog directory.
MESS_EPPSFIPS_CDR_DS.CAT: Describes the general content of the FIPS
calibrated data set and includes information about the duration
of the mission and the person or group responsible for producing
the data.
MESS_EPPS_INST.CAT: Describes physical attributes of the EPPS instrument and
provides relevant references to published literature.
MESS_INST_HOST.CAT: Describes the MESSENGER spacecraft.
MESS_MISSION.CAT: Describes the scientific goals and objectives of the
MESSENGER program. It also identifies key people and institutions.
MESS_PERSON.CAT: Lists and provides contact information for the people
involved in the MESSENGER mission, including those involved with EPPS.
MESS_REF.CAT: Contains the reference objects. These reference additional
documents that may be useful to the person using the EPPS data.
❮ DOCUMENT ❯ Directory
This directory contains the documentation that will be needed in
order to understand and analyze this data volume. The
documents are separated into individual subdirectories according to
the document type. The following file is included in the subdirectory.
DOCINFO.TXT: Identifies and describes the function of each file in the
DOCUMENT directory.
CDR_SIS/: Directory containing the CDR SIS document in various formats.
========================================================================
Related PDS Products
========================================================================
========================================================================
Errata
========================================================================
Every effort has been made to ensure that the data and documentation are
of the best possible quality. However, mistakes are inevitable. The
Planetary Plasma Interactions (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 it was published.
If you find an error on this disk, please report the error to the PDS
Operator at the PPI Node of the PDS at the address or numbers listed
under contacts below.
========================================================================
Contacts
========================================================================
For questions concerning these data products and documentation, contact:
Planetary Plasma Interactions Node
UNIVERSITY OF CALIFORNIA, LOS ANGELES
INST. OF GEOPHYSICS AND PLANETARY PHYSICS
6707 GEOLOGY
LOS ANGELES, CA 90095-1567 USA
(310) 206-6073
WWW Site: http://pds-ppi.igpp.ucla.edu
Electronic mail address: pds_operator@igpp.ucla.edu
For questions regarding PDS Standards or other archive volumes available
from the PDS, please contact PDS Operator at the PDS Central Node (at
JPL):
EMAIL 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 MESSENGER EPPS team that were involved in the
production of this volume is given in /CATALOG/MESS_PERSON.CAT.
The PDS, and the Planetary Plasma Interactions 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
volume should be reported back to the PPI Node of the PDS through the
ERRATA reporting procedures described above.
|