| DATA_SET_DESCRIPTION |
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.
Note that this is the first version archived for this dataset.
Version 1 was never archived.
The data have been measured in the time intervals
-June 1, 2005
RPC was switched on for a S/W patch .
-JUNE 16, 2005 - JUNE 21,2005
Her we intended to search for the trail of Comet Catalina.
Unfortunately the data are corrupted, as the instrument did not
power on
in the right way. The OB Sensor was saturated.
-October 3, 2005
This was the Passive Checkout #1 (PC1).
-February 15, 2006
Here only HK data are available, as RPC was switched on only for a
LAP S/W patch.
-February 23, 2006
Here only HK data are available, as RPC was switched on only for a
LAP S/W patch.
-February 24, 2006
Here only HK data are available, as RPC was switched on only for a
LAP S/W patch.
-March 7, 2006
This was the Passive Checkout #2 (PC2).
-June 4, 2006 - June 8, 2006
These data cover the encounter of the ion tail of Comet
45P/HONDA-MRKOS
All magnetic field data are calibrated data. That means the data
represent the 3 components of the magnetic field measured in physical
units (nT). Data are given in instrument coordinates (LEVEL_A),
S/C coordinates (LEVEL_B) or ECLIPJ2000 coordinates (LEVEL_C).
Calibration has been applied according
to the Ground calibration results which means:
- temperature dependent offset calibration
- temperature dependent sensitivity calibration
- temperature dependent misalignment calibration
Bad vectors have been removed. Any s/c generated noise and s/c
caused residual magnetic fields are not eliminated. The ground
temperature model for the sensor calibration has been improved
(expanded for a wider temperature range down to - 130 deg C) using
long term temperature model obtained from flight data.
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.
LEVEL Description, Science Data
===============================
LEVEL_A : Calibrated data in INSTRUMENT coordinates
(Unit Reference frame)
Table content: Time (UTC), Time(OBT),
Magnetic Field (Bx, By, Bz) [nT],
Sensor Temperature [K], Quality Flags
LEVEL_B : Calibrated data in s/c-coordinates
Table content: Time (UTC), Time(OBT),
Magnetic Field (Bx, By, Bz) [nT],
Sensor Temperature [K], Quality Flags
LEVEL_C : Calibrated data in ECLIPJ2000-coordinates
Table content: Time (UTC), Time(OBT),
Position (X,Y,Z) [km],
Magnetic Field (Bx, By, Bz) [nT],
Quality Flags
LEVEL Description, Housekeeping Data
=======================================
LEVEL_A : Calibrated Housekeeping data in Physical units
Table Content:
Time (UTC), Time (OBT),
Temperatures (IB,OB) [K],
Stage_IDs (Flag A,Flag B), Filter Config Flag,
Voltages (Mag_Ref (2.5V), Mag_Neg (-5V), Mag_Pos (+5V)) [V],
Magnetic Field (OB-X,OB-Y,OB-Z) [nT] (Instrument coord.),
LEVEL_B : No HK Data
LEVEL_C : No HK Data
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_CLA_OB_M3.LBL
RPCMAG040528T1230_CLA_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.
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