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.
The data have been measured during the PRELANDING Phase of ROSETTA.
Included are the following sub-phases:
-the Rendezvous Manoeuvre 2 (RVM2) between January and September 2014
-the Post Hibernation Commissioning in March/April 2014
-the Near Comet Drift Phase (NCD) between March and July 2014
-the Far Approach Trajectory (FAT) between July and August 2014
-the Comet Characterization Phase (CC) between August and September
-the Global Mapping Phase/Close Observation Phase (GMP/COP) between
September and October 2014
-the Landing and First Science Sequence (LD/FSS) between October and
November 2014. The several landings of PHILAE happened on November 12, 2014.
CVP1 from 2014-03-23T22:02 to 2014-03-27T05:00 : RVM2
CVP2 from 2014-04-16T22:02 to 2014-04-17T07:00 : RVM2
CVP3 from 2014-04-24T21:02 to 2014-04-24T23:45 : RVM2
MTP0003 - STP0003 from 2014-05-09T15:10 to 2014-05-20T11:55 : NCD
MTP0003 - STP0004 from 2014-05-23T14:45 to 2014-06-03T10:39 : NCD
MTP0004 - STP0005 from 2014-06-06T03:31 to 2014-06-17:09:44 : NCD
MTP0004 - STP0006 from 2014-06-20T02:30 to 2014-07-01:08:35 : NCD
MTP0005 - STP0007 from 2014-07-04T02:35 to 2014-07-08T08:35 : FAT
MTP0005 - STP0008 from 2014-07-11T02:35 to 2014-07-15T02:35 : FAT
MTP0005 - STP0009 from 2014-07-18T02:35 to 2014-07-22T02:25 : FAT
MTP0005 - STP0010 from 2014-07-25T02:25 to 2014-08-01T09:59 : FAT
MTP0006 - STP0011 from 2014-08-01T10:00 to 2014-08-05T09:59 : CC
MTP0006 - STP0012 from 2014-08-05T10:00 to 2014-08-12T09:59 : CC
MTP0006 - STP0013 from 2014-08-12T10:00 to 2014-08-19T09:59 : CC
MTP0006 - STP0014 from 2014-08-19T10:00 to 2014-08-25T09:59 : CC
MTP0006 - STP0015 from 2014-08-25T10:00 to 2014-09-02T09:59 : CC
MTP0007 - STP0016 from 2014-09-02T10:00 to 2014-09-09T10:00 : GMP/COP
MTP0007 - STP0017 from 2014-09-09T10:00 to 2014-09-16T10:00 : GMP/COP
MTP0007 - STP0018 from 2014-09-16T10:00 to 2014-09-23T10:00 : GMP/COP
MTP0008 - STP0019 from 2014-09-23T10:00 to 2014-09-28T10:00 : GMP/COP
MTP0008 - STP0020 from 2014-09-28T10:00 to 2014-10-03T10:00 : GMP/COP
MTP0008 - STP0021 from 2014-10-03T10:00 to 2014-10-10T10:00 : GMP/COP
MTP0008 - STP0022 from 2014-10-10T10:00 to 2014-10-17T10:00 : GMP/COP
MTP0008 - STP0023 from 2014-10-17T10:00 to 2014-10-24T10:00 : GMP/COP
MTP0009 - STP0025 from 2014-10-24T10:00 to 2014-10-30T10:00 : LD/FSS
MTP0009 - STP0026 from 2014-10-30T10:00 to 2014-11-05T10:00 : LD/FSS
MTP0009 - STP0027 from 2014-11-05T10:00 to 2014-11-11T00:00 : LD/FSS
MTP0009 - STP0028 from 2014-11-11T00:00 to 2014-11-18T00:00 : LD/FSS
MTP0009 - STP0029 from 2014-11-18T23:25 to 2014-11-21T23:25 : LD/FSS
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 CSEQ 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 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 and by the LANDER
Philae, 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.
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.
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 CSEQ-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
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 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 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 V6.0.
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 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.
|