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.
Data have been measured during the COMET ESCORT 1 Phase of ROSETTA.
Included are the following sub-phases:
MTP0010 - STP0030 from 2014-11-22T00:00 to 2014-11-25T23:25
MTP0010 - STP0031 from 2014-11-25T23:25 to 2014-12-02T23:25
MTP0010 - STP0032 from 2014-12-02T23:25 to 2014-12-09T23:25
MTP0010 - STP0033 from 2014-12-09T23:25 to 2014-12-16T23:25
MTP0010 - STP0034 from 2014-12-16T23:25 to 2014-12-19T23:25
MTP0011 - STP0035 from 2014-12-19T23:25 to 2014-12-23T23:25
MTP0011 - STP0036 from 2014-12-23T23:25 to 2014-12-30T23:25
MTP0011 - STP0037 from 2014-12-30T23:25 to 2015-01-06T23:25
MTP0011 - STP0038 from 2015-01-06T23:25 to 2015-01-13T23:25
MTP0012 - STP0039 from 2015-01-13T23:25 to 2015-01-20T23:25
MTP0012 - STP0040 from 2015-01-20T23:25 to 2015-01-27T23:25
MTP0012 - STP0041 from 2015-01-27T23:25 to 2015-02-03T23:25
MTP0012 - STP0042 from 2015-02-03T23:25 to 2015-02-10T23:25
MTP0013 - STP0043 from 2015-02-10T23:25 to 2015-02-17T23:25
MTP0013 - STP0044 from 2015-02-17T23:25 to 2015-02-24T23:25
MTP0013 - STP0045 from 2015-02-24T23:25 to 2015-03-03T23:25
MTP0013 - STP0046 from 2015-03-03T23:25 to 2015-03-10T23:25
All magnetic field data are calibrated, resampled data. That means the
data represent the 3 components of the magnetic field measured in
physical units (nT). Calibration has been applied according to the
Ground calibration results which means:
- temperature dependent offset calibration
- temperature dependent sensitivity calibration
- temperature dependent misalignment calibration
Data are given in different coordinates, dependent on the calibration
LEVEL.
LEVEL_F : averaged data in s/c-coordinates
Source of these data are LEVEL_B data.
LEVEL_G : averaged data in celestial-coordinates
Source of these data are LEVEL_C data.
LEVEL_H : calibrated data in celestial-coordinates,
disturbance of S/C-reaction wheel eliminated,
OB and Burstmode only,
Source of these data are LEVEL_C data.
Bad vectors have been removed. Any 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) and average interval (A,
where n denotes the average interval in seconds). Data can uniquely be
identified by their file names.
Averaging means calculating a mean value of of the specified interval
in time domain. It does not mean any mixing of data from the OB and IB
sensor.
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 where 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.
REMARK:
=======
Due to strong magnetic disturbance by the ORBITER,
the magnetic field data are influenced by s/c generated
magnetic fields. The source of these disturbance is manifold:
- transient currents flowing on the spacecraft
- Heater pulses
- Thruster related magnetic field
- Reaction wheel signatures
- etc.
Due to the complexity of these circumstances a proper data
cleaning is an ongoing task. Thus the data of the present dataset
still contain the mentioned disturbance signatures.
Therefore, any use of the data for scientific research has to be
done under consideration of these disturbances. Please refer to
the documentation.
REMARK ON TIMING
================
It turned out that the OB data are shifted against IB data and also
against ROMAP data by 1s. This behavior has not been corrected in the
data. Therefore, for proper comparison in high resolution analyses,
a time shift of 1s should be subtracted from all OB data.
Alternatively OB data can be left as they are and a 1s shift had to
be added to the IB and ROMAP 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
The HK mode contains coarse magnetic field information, measured by
the primary sensor with 16 bit resolution only. These data will not
be calibrated and are not for any purpose.
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 RESAMPLED averaged data (CLF,CLG) are coded
as follows:
___A.
RPCMAG yymmdd CLF IB A60 LBL
CLG OB TAB
Example: RPCMAG040528_CLG_OB_A60.LBL
RPCMAG040528_CLG_OB_A60.TAB
Average denotes the time interval for one average period in seconds.
The filenames for RESAMPLED Heater or Reaction Wheel influenced data
(CLH) are coded as follows:
___.
RPCMAG yymmddThhmm CLH IB M3 LBL
OB TAB
Example: RPCMAG040528T1230_CLH_OB_M3.LBL
RPCMAG040528T1230_CLH_OB_M3.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 or. This reference frame is built up by Ecliptic
Coordinates related to Equinox of Epoch J2000.
Orientation:
X: Pointing from SUN to Vernal Equinox,
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.
Version Information
===================
The first version of RPCMAG datasets being archived for this comet
phase and calibration level was V5.0.
The actual version is V9.0. It features
-improved offset calculation
-new temperature calibration
-s/c disturbance assessment
-updated documentation
-extended data flagging
Scientific Background
=====================
The following papers have either been published based upon RPC/RPC-MAG
data or contain basic information about cometary plasmaphysics. The
listed papers may be useful in helping to understand the data and its
usage:
[GLASSMEIERETAL2007A],[HANSENETAL2007],[ACUNAETAL1992],[ALFVEN1957],
[AUSTERETAL2007],[AUSTERETAL2015],[BEHARETAL2016],[BEHARETAL2017],
[BIERMANN1951],[BURCHETAL2007],[CARRETAL2007],[COATESETAL1993],
[EDBERGETAL2009],[EDBERGETAL2016],[EICHELBERGERETAL2002],[ERIKSSONETAL2007],
[GLASSMEIER&NEUB1993],[GLASSMEIERETAL1993],[GLASSMEIERETAL2007B],
[GLASSMEIER2016],[GOETZETAL2016A],[GOETZETAL2016B],[GOETZETAL2017],
[GOETZETAL2018],[GOLDSTEINETAL2015],[GUNELLETAL2017],[HAJRAETAL2017],
[HEDGECOCK1975],[HEINISCHETAL2016],[HEINISCHETAL2017],[HEINISCHETAL2018A],
[HENRIETAL2017],[HUDDLESTONETAL1993],[JOHNSTONEETAL1993],[KOENDERSETAL2013],
[KOENDERS2015],[KOENDERSETAL2016A],[KOENDERSETAL2016B],[KOLOKOLOVAETAL2016],
[MADANIANETAL2016],[MANDTETAL2016],[MCKENNAETAL2016],[MEIERETAL2016],
[MOTSCHMANN&GLASS1993],[NEMETHETAL2016],[NEUBAUER1981],[NEUBAUERETAL1983],
[NEUBAUERETAL1993A],[NEUBAUERETAL1993B],[NEUHAUS2001],[NILSSONETAL2006],
[NILSSONETAL2015],[NILSSONETAL2017],[OMERBEGOVIC1999],[OTHMER&RICHTER2001],
[PLASCHKEETAL2017],[RICHTERETAL2011],[RICHTERETAL2011B],[RICHTER&RAHM2001],
[RICHTER&CUPIDO2011],[RICHTERETAL2015],[RICHTERETAL2016],
[SCHMIDT&WEGMANN1982],[SMITHETAL1993],[STENBERGWIESETAL2017],[SULIVAN2001],
[TIMARETAL2017],[TROTIGNONETAL2007],[TROTIGNONETAL2009],[TSURUTANI&SMITH1986],
[VIGRENETAL2017],[VOLWERKETAL2013],[VOLWERKETAL2014],[VOLWERKETAL2016],
[VOLWERKETAL2017],[VOLWERK2018],[VOLWERKETAL2018],[WALLIS1973],
[WINSKEETAL1985],[WITASSEETAL2017],[WU&DAVIDSON1972].
Additionally all documents in the present DOCUMENT folder provide precious
and necessary information in order to understand the RPC-MAG data and to
assess potential disturbances seen in the data.
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