PDS_VERSION_ID = PDS3      

RECORD_TYPE  = STREAM
INSTRUMENT_HOST_NAME = "ROSETTA-ORBITER"

OBJECT     = TEXT
 PUBLICATION_DATE   = 2006-10-26
 INTERCHANGE_FORMAT = ASCII
 NOTE               = "ASCII description of contents of this RPC-LAP Archive"
END_OBJECT = TEXT

END

************                   File AAREADME.TXT     ************************

Acronyms:
=============================================================================
HK          Housekeeping data (Supply voltages, Ref. voltages, Temperatures)
RPC         Rosetta Plasma Consortium
LAP         Langmuir Probe Instrument


Overview:
=============================================================================
The RPC LAP instrument, can operate in several different modes. To understand
the data one must always consult the corresponding LBL file. The instrument
measures timeseries of current or voltage. These are stored in a basic
table format with columns of time, current and voltage. Current and voltage can
either be applied bias or measured values. Depending on if the instrument is
running in E-Field or Density configuration. The keywords INSTRUMENT_MODE_DESC 
and DESCRIPTION field, gives descriptions for the present instrument mode at a 
given time. The RPC LAP specific keywords described in the RO-IRFU-LAP-EAICD.DOC 
(in the DOCUMENT directory) also give information about the present mode. The
INSTRUMENT_MODE_ID descriptions can be found in the document LAPMAC.DOC
(in the DOCUMENT directory).

RPC-LAP Data Archive
=============================================================================


a) LAP DATA
===========

For each mission phase RPC LAP provides, datasets as follows:

CODMAC Level/Type             Data Type      Data Content
-----------------------------------------------------------------------------
  2 / EDITED     Data         table          Decommutated RAW data 
  3 / CALIBRATED Data         table          Calibrated data 

Derived data is not yet supported. 
The data can be found in:

DATA/CALIBRATED/YEAR/MMM/DDD

or the

DATA/EDITED/YEAR/MMM/DDD

There MMM is month in text JAN,FEB,...etc.
There DDD is day in the month as D01, D02,...etc.

b) Supporting files
===================

Supporting files for the Archive user include PDS descriptions, documents,
and searchable indices. These have been organized into four directories one
level below the root: CATALOG, DOCUMENT,CALIB, INDEX


                             Structure of the volume
-----------------------------------------------------------------------------
AAREADME.TXT  (PDS required introduction to the data set)
VOLDESC.CAT   (PDS required volume description of the data only)
../CATALOG/CATINFO.TXT (list of catalog files)
           *.CAT (Mission, spacecraft, instrument, data, references)
           
../CALIB/CALINFO.TXT (list of calib files)
    
    


../DOCUMENT/DOCINFO.TXT (list of documents)
            *.DOC (WORD documents)
            *.TXT (ASCII documents)
            *.PDF (PDF documents)

../INDEX/INDXINFO.TXT (Description of the contents of the index directory)
         INDEX.LBL    (PDS LABEL file for INDEX.TAB)
         INDEX.TAB    (Index of the data set in tabular format)


../DATA/EDITED/YEAR/MMM/DDD/*.TAB (LAP edited data, presented as ASCII tables)
                            *.LBL( PDS LABLES of the LAP data files)                   


../DATA/CALIBRATED/MMM/DDD/*.TAB (LAP calibrated data, presented as ASCII tables)   
                           *.LBL (PDS LABLES of the LAP data files)                   

The ROSETTA project decided that the data would be archived in the PDS
format. Consequently, the layout of this volume and the labels for each file
conform the PDS/PSA guidelines.


Contact:
========

Data generated by:

Erik P G Johansson
Swedish Institute of Space Physics
Box 537 
SE-751 21 Uppsala, Sweden