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PDS_VERSION_ID          = PDS3                                               
RECORD_TYPE             = STREAM                                             
OBJECT                  = TEXT                                               
  PUBLICATION_DATE      = 2017-05-12
  NOTE                  = "AAREADME.TXT describes this volume."              
END_OBJECT              = TEXT                                               
END                                                                          
                                                                             
                          MESSENGER                                          
    Energetic Particle and Plasma Spectrometer Calibrated and Derived Data   
                                                                             
                           MESEPPSDDR1                                       
                                                                             
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) derived 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 Energetic Particle         
Spectrometer (EPS) 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.                                                             
                                                                             
========================================================================     
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_EPPSEPS_DDR_DS.CAT        EPPS EPS derived data set description       
                                                                             
Additional information on volume organization is given in the DDR SIS        
on 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 volume. Refer to the AAREADME.TXT file on that volume.              
                                                                             
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 DDR Data Archive Volume            
                                                                             
The following illustration shows the directory structure overview for        
the EPPS DDR Data Archive Volume. This volume contains the EPPS EPS DDR 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 DDRs (if needed) will     
also be delivered according to the same schedule. Revised DDRs will have     
an incremented version number in the PDS label.                              
                                                                             
Data Volume Directory Structure Overview                                     
                                                                             
                            MESSEPPSDDR1 ❮ROOT❯                              
_________________________________|________________________________________   
   |           |                 |          |          |             |       
❮DATA❯      ❮LABEL❯          ❮INDEX❯     ❮LABEL❯    ❮DOCUMENT❯    ❮BROWSE❯   
   |
   |___________________________________                                                                         
   |                                  |                                            
❮EPS_PA_VALUES❯               ❮EPS_PA_DAILY_SPECTROGRAM❯                                            
        |                             |                                         
   _____|_____________          ______|____________                                    
   |        |        |          |        |        |                        
 ❮2008❯   ❮2009❯   ❮2010❯ ... ❮2011❯   ❮2012❯   ❮2013❯ ...                                          
     |                                                                   
  ___|___________                                                        
 |       |       |                                                       
❮JAN❯   ❮FEB❯   ❮MAR❯ ...                                                 
                                                                             
                                                                             
Directory Contents:                                                          
                                                                             
MESSEPPSDDR1 ❮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. Directs user to          
other documents on the volume containing more detailed information.          
                                                                             
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 and DDRs meant to replace CDRs         
and DDRs in a previous PDS delivery.                                         
                                                                             
CHECKSUMS.TXT: Contains MD5 checksums for the entire volume.
                                                                                                                      
❮DATA❯ Directory                                                             
                                                                             
This top level directory contains the subdirectories                         
corresponding to the standard data products (described in the EPPS           
DDR SIS). The directories are further subdivided into YEAR and MONTH         
directories.                                                                 
                                                                             
❮LABEL❯ Directory                                                            
                                                                             
This subdirectory contains the "label fragments" (i.e., the *.FMT files)     
for all data products on the volume.  These format files describe the        
table and data objects which store the data.                                 
                                                                             
❮BROWSE❯ Directory                                                           
                                                                             
This top level directory contains spectrogram browse products.               
                                                                             
❮INDEX❯ Directory                                                            
                                                                             
This subdirectory contains the indices for the EPPS CDR and DDR 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 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.                                
                                                                             
                                                                             
========================================================================     
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 volume, 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                       
          Email 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.