Data Set Information
DATA_SET_TERSE_DESCRIPTION This dataset contains RPCMAG RESAMPLED DATA of the COMET ESCORT 1 Phase. Included are data 22.11.2014 - 10.03.2015.
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_F :  averaged data in s/c-coordinates
            Source of these data are LEVEL_B 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

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

 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
      These rectangular disturbances are in the order of 1-2 nTpp,
      depending on the heaters and occur with the PWM periods of
      the heaters (usually a few seconds up to minutes)

  - Thruster related magnetic field disturbances
      These signatures are in the order of 3 nTpp and occur during
      Wheel off loading  (WOL) maneuvres and Orbit correction
      maneuvres (OCM). Endurance is usually up to 20 minutes.
      Additional spikes occur during OCMs with periods of
      625 mHz and amplitudes of 6 nTpp and about 200ms width.

  - Reaction wheel (RW) signatures
      The  four rotating s/c  RWs are causing  four different
      sinusoidal disturbances with usually slowly varying frequencies
      in the range of 1-10 Hz with amplitudes of about 3nTpp.
      The 'tilted traces' of these signatures can clearly be seen in
      the dynamic spectra and can easily be distinguished from
      external magnetic field variations.

  - Interference by the RPC-LAP instrument
      There are times where the LAP instrument can be seen in the
      magnetic field spectrum. The disturbance occurs at a constant
      frequnecy of either 3.2 Hz or 3.6 Hz with an amplitude of
      about 1 nT.

  - 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.

 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:


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 used for any purpose.

Due to operational constraints it might happen that the instrument
mode or the primary sensor has to be switched during a specific
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:

RPCMAG          yymmdd           CLF      IB    A60         LBL
                                 CLG      OB                TAB

Example: RPCMAG040528_CLG_OB_A20.LBL

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      M1..M6      LBL
                                          OB                  TAB

Example: RPCMAG040528T1230_CLH_OB_M3.LBL

LEVEL Description, Science Data

LEVEL_F : Calibrated data in s/c-coordinates
          Table content: Time (UTC), Time(OBT),
                         Magnetic Field (Bx, By, Bz) [nT],
                         Sensor Temperature [K], Quality Flags

Geometry Information - Coordinate System
The geometry items
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.
    X: Pointing from SUN to Vernal Equinox,
    Y: perpendicular to X in Ecliptic Plane,
    Z: Perpendicular to Ecliptic plane, pointing up

The items
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 the comet
phase was V5.0. The actual version of this dataset is V6.0. The
version number had to be increased due to changes in houskeeping data
and quality flag changes.
DATA_SET_RELEASE_DATE 2015-09-30T00:00:00.000Z
START_TIME 2014-11-22T12:00:00.000Z
STOP_TIME 2015-03-10T11:59:59.000Z
MISSION_START_DATE 1995-03-01T12:00:00.000Z
NODE_NAME Small Bodies
This data set has  the same structure as the
                         former RPCMAG datasets obtained between 2004
                         and 2011.
                         Those datasets have been reviewed by two
                         independent teams in Spring 2012. After these
                         reviews the datasets had been accepted by
                         the Planetary Science Archive(PSA) of the ESA
                         and by the Planetary Data System(PDS) of NASA
                         for long-term archiving.
                         A third review by european and US peers
                         took place in February 2016 and a fourth
                         review happened in October 2017.RPCMAG passed
                         these reviews very well with with only some
                         minor and editorial issues. All the required
                         updates and changes due to this review were
                         implemented in the present dataset.
                         All data have been processed  on best effort
                         basis 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. Both documents
                         are available in the DOCUMENT directory.
CITATION_DESCRIPTION Glassmeier K.-H., Richter I., Koenders C., Goetz C., Eichelberger. H, Cupido E., ROSETTA RPCMAG COMET ESCORT 1 (ESC1) RESAMPLED DATA RECORD V6.0, RO-C-RPCMAG-4-ESC1-RESAMPLED-V6.0, ESA Planetary Science Archive and NASA Planetary Data System, 2016
ABSTRACT_TEXT This dataset contains RESAMPLED DATA (CODMAC LEVEL 4) of the COMET ESCORT1 Phase (ESC1) from November 22, 2014 until March 10,2015 of the ROSETTA orbiter magnetometer RPCMAG. Data are averaged to 1s and 60s means. Observations are done in the vicinity of comet 67P/CHURYUMOV-GERASIMENKO 1 (1969 R1). The current version of the dataset is V6.0
  • SBN Comet Website