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SPACE PLASMA PHYSICS GROUP
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The MSSL Space Plasma Physics Group pages have moved to

HTTP://WWW.UCL.AC.UK/MSSL/SPACE-PLASMA-PHYSICS.

Information about the PEACE instruments on the Cluster and Double Star Missions remains up-to-date on this site. Please update your links accordingly

Double Star PEACE Prime Parameters


Latest Version : 5.0


Information in the data files:
  • time-tag 
interval centred (click here for more information)
  • status
Status[0] Data quality as defined by CSDS

value
interpretation
0
bad data
1
use with caution
2
OK
255
fill value

Status[1] Moments Calculation Route

value
interpretation
0
data removed
1
produced from transmitted 2D velocity distribution
2
produced from transmitted 3D velocity distribution
3
produced from transmitted JPEG compressed 3D velocity distribution

Status[2] Moments Production Key

bit
value
interpretation
7
0
on two consecutive spins the sensor covers the same energy range

1
on two consecutive spins the sensor covers different energy ranges
6
0
full energy range of high energy spins transmitted

1
overlap region of high energy spins not transmitted
5
0
low energy spin
5
1
high energy spin
4
-
not used
3
0
spacecraft potential determined using PEACE onboard software

1
spacecraft potential determined on ground
2
1
ASPOC on
1
1
QM corrector used
0
0
lowest measured energy > V_SC

1
lowest measured energy < V_SC

Status[3] Supporting Information

bit
value
interpretation
7
1
caution : risk of low statistics
6
1
caution : risk of saturation
5
-
not used
4
-
not used
3
1
PEACE sensor to DPU data transfer error
2
1
no FGM data available
1
-
not used
0
-
not used


  • N_e_den
electron density in cm-3
  • V_e_xyz_gse
electron GSE velocity in km/s
  • T_e_par
parallel electron temperature in MK
  • T_e_perp
perpendicular electron temperature in MK
  • Q_e_para
parallel electron heat flux in mu J m-2 s-1

Notes

Removal of data

Data is removed under the following conditions:
  1. during MCP tests. MCP tests are detected by checking that HAR mode is used, and that the MCP levels are varying.
  2. when the MCP level is set to zero.
  3. the first 3 spins after a PEACE instrument is switched on.


Possible INST_MODE messages

Tn>PEA>m>YYYY-MM-DDTHH:MM:SS.SSSZ>PEA_On>88m28-60m00-f-aa
Tn>PEA>m>YYYY-MM-DDTHH:MM:SS.SSSZ>PEA_Eng>MCP_Test 88h58
Tn>PEA>m>YYYY-MM-DDTHH:MM:SS.SSSZ>PEA_Eng>Grid_On
Tn>PEA>m>YYYY-MM-DDTHH:MM:SS.SSSZ>PEA_Eng>Grid_Off
Tn>PEA>m>YYYY-MM-DDTHH:MM:SS.SSSZ>PEA_Off>PEACE_science_off

where n is the spacecraft number, and m is the record number that the message first applies to.

Possible INST_SETTINGS messages

YYYY-MM-DDTHH:MM:SS.SSSZ>sunpulse rephase offset>1104

Versions

Important Note: the version number is given in the caveats. Do not use the version number of the cdf file.
  • version 1
    • crude S/C potential correction
    • v1 calibration file
  • version 2
    • crude S/C potential correction
    • timing corrected
    • v1 calibration file
  • version 3
    • crude S/C potential correction
    • additional timing corrections
    • more detailed INST_MODE messages
    • v2 calibration file
  • version 4
    • crude S/C potential correction
    • further timing corrections
    • more detailed INST_MODE messages (aa or ab listed)
    • more detailed status bytes
    • calibration version information included (Calib_input)
    • reference to the Double Star instrument paper included
    • v1 calibration file used for TC-1 & TC-2
    • additional caveats
      • TC-2 2004-08-26 to 2004-08-31 contain fill values only due to sweep preset problems with the IDFS data
      • TC-2 2004-12-31 contains fill values only due to IDFS data problems

  • version 4.1
    • same as version 4, but used PEACE science data from v2.0 raw -> IDFS ingestion software (low & high energy red stripe removal included)
  • version 4.2
    • same as version 4, but used PEACE science data from v2.1 raw -> IDFS ingestion software (new Double Star IDFS 3DF data put into the MSSL IDFS archive on 2005-11-01). The latest 3DF data has some fill value problems corrected, and better red stripe removal.
    • fill values in cdf files are correct
    • note that when eclipse mode is used: (1) PP timestamps maybe incorrect, (2) PEACE moments may not be accurate. This will be improved in a future release of the Double Star PEACE Prime Parameters.
  • version 5.0
    • same as version 4.2, but moments generated with improved inter-anode calibration





Last Update: 09 Aug 2007, A.D. Lahiff

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www.ucl.ac.uk/mssl/space-plasma-physics/news

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www.ucl.ac.uk/mssl/space-plasma-physics/publications


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