Data Set Overview
=================


The data from the ROSETTA PLASMA CONSORTIUM (RPC) Fluxgate
Magnetometer (MAG) was submitted by Ingo Richter (TM) for the RPCMAG
team. The PI of the team is Karl-Heinz Glassmeier.


The data have been measured in the time intervals

 -June 24, 2010
  RPC was switched to monitor the Lander Panel Test


 -March 14 -March 15, 2010
  RPCMAG was swichted on for the LUTETIA flyby Rehearsal. We intended
  to get a reference measurement for comparison with the data of the
  real flyby in June 2010. Unfortunately the rehearsal conditions
  diverged significantly from those at the very flyby. Thus these data
  could not be used as a good reference model.

 -April 27, 2010
  This was the Payload Checkout #12 (PC12).


All magnetic field data are edited raw data. That means the data
represent the 3 components of the magnetic field measured in counts of
the used 20 bit ADC. Data are given in instrument coordinates. Neither
any filtering nor any calibration has been applied to the data. Any
s/c generated noise and s/c caused residual magnetic fields are not
eliminated.

The data are sorted by the sensor (OB: outboard sensor, IB: inboard
sensor) and the measurement mode (M1..M6). They can uniquely be
identified by their file names.

Normally the OB is the Primary (Pri) and the IB is the Secondary (Sec)
sensor. However, this order can be toggled by TCs. This feature has
been tested especially during the commissioning phases.

In cases were the PRIMARY and SECONDARY sensor were toggled the
individual data files (OB/IB) will contain data measured with
different sampling rates according to the actual sampling rates of
the PRIMARY and SECONDARY sensors. Refer to the MODE DESCRIPTION
table below. The actual sampling rate is the only indicator
showing which sensor is the primary and which is the secondary
one.

Mode description:
=================

MODE SAMPLE RATE PACKET PERIOD PACKET LENGTH VECTOR RATE

Minimum Mode M1  1/32 Hz 1024 s   32 Pri Vec 0.03125 vec/s
                                   1 Sec Vec 0.000976 vec/s
Normal Mode M2      1 Hz   32 s   32 Pri Vec 1 vec/s
                                   1 Sec Vec 0.03125 vec/s
Burst Mode M3      20 Hz   16 s  320 Pri Vec 20 vec/s
                                  16 Sec Vec 1 vec/s
Medium Mode M4      5 Hz   32 s  160 Pri Vec 5 vec/s
                                   1 Sec Vec 0.03125 vec/s
Low Mode M5      0.25 Hz  128 s   32 Pri Vec 0.25 vec/s
                                   1 Sec Vec 0.007812 vec/s
Test Mode M6       20 Hz   16 s  320 Pri Vec 20 vec/s
                                   1 Sec Vec 0.0625 vec/s
HK Mode                    32 s    8 words 0.03125 vec/s



FILENAME CONVENTION & Mode Coding
===================================
Due to operational constraints it might happen that the instrument
mode or the primary sensor has to be switched during a specific
observation.
The actual mode and the primary sensor of the instrument can easily
be identified by analyzing the filename of the actual data files. The
complete filename convention is listed in the EAICD, chapter 3.1.4.

The filenames for EDITED and CALIBRATED data are coded as follows:

  ___.
RPCMAG  yymmddThhmm             RAW       IB     M1..M6      LBL
                                CLA       OB                 TAB
                                CLB
                                CLC

Example: RPCMAG040528T1230_RAW_OB_M3.LBL
         RPCMAG040528T1230_RAW_OB_M3.TAB


The filenames for Housekeeping data are coded as follows:

  _.
RPCMAG         yymmddThhmm         HK      LBL
                                           TAB

Example: RPCMAG040528T1230_HK.LBL
         RPCMAG040528T1230_HK.TAB




Geometry Information - Coordinate System
========================================
The geometry items
  SC_SUN_POSITION_VECTOR
  SC_TARGET_POSITION_VECTOR
  SC_TARGET_VELOCITY_VECTOR
provided in the label of the data product are relative to the
ECLIPJ2000 frame. This reference frame is built up by  Ecliptic
Coordinates related to Equinox of Epoch J2000.
Orientation:
    X: Pointing from SUN to Vernal Equinoxe,
    Y: perpendicular to X in Ecliptic Plane,
    Z: Perpendicular to Ecliptic plane, pointing up

The items
  SUB_SPACECRAFT_LATITUDE
  SUB_SPACECRAFT_LONGITUDE
are given in the PLANETOCENTRIC coordinate system.

All these geometry parameters are computed at time t=START_TIME.
Distances are given in km, angles in degrees.

This dataset has been reviewed by two
                        independent review teams in autumn 2008.
                        After these reviews the dataset has been
                        accepted by the Planetary Science Archive(PSA)
                        of the ESA and by the Planetary Data System
                        (PDS) of NASA for the longterm archiving.
                        The data have been processed  on best effort
                        base according to the procedures described in
                        RO-IGEP-TR0028: Step by Step Calibration
                        Procedure. Quality  flags are attached for
                        CALIBRATED and RESAMPLED data as described in
                        the EAICD RO-IGEP-TR0009.