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Cluster Summary Parameter Plasma Electron and Current Experiment (PEACE) Data

ResourceID
spase://ESA/NumericalData/Cluster/PEACE/SummaryParameter/PT60S

Description

The primary task of this instrument (PEACE: Plasma Electrons and Currents Experiment) is to obtain the velocity moments of the distribution function of electrons as frequently and as accurately as the spacecraft telemetry will allow. Detector counts are collected in energy, polar-angle, and azimuth-angle bins to form a three-dimensional matrix. Two sensors are used: LEEA (low-energy electron analyzer) and HEEA (high-energy electron analyzer). The energy coverage is from 0.67 eV to 30 KeV in 92 levels. The first 16 levels are equally spaced linearly up to 10.7 eV; the remainder are logarithmically spaced. Both sensors can use the full range, but the HEEA will normally operate over a higher energy range than the LEEA. The LEEA specializes in coverage of the energies from 0.7-10 eV, and has a geometric factor one fifth that of the HEAA. Both sensors consist of hemispherical electrostatic analyzers of the top-hat type and a detector in the form of an annular micro-channel plate with a position-sensitive readout. Each sensor covers the range 0-180 degrees with respect to the spin axis, and they are mounted opposite each other with a view perpendicular to the spin axis, thus covering the complete angular range in a half rotation of the spacecraft. The field of view perpendicular to the fan is 2 degrees for the LEEA and 5.6 degrees for the HEEA. Energy resolution (Delta-E)/E is 0.13 for LEEA and 0.16 for HEEA. There are four sweep modes, synchronized to the spin period (4 s), to vary the azimuthal angular resolution. The spin phasing can be made coincident with that of the CIS instrument, to ensure that the electron and ion moments will be measured simultaneously. On-board processing is used to calculate the moments of the distribution with an accuracy of 1% and to select suitable parts of the complete distribution for transmission. The normal science data format is based on one spin period, and consists of core data followed by other optional distributions as can be fit into the available telemetry for that spin. The core data (moments, spacecraft potential, and pitch angle distribution) are always transmitted (if the spin is nominal). The next distribution is transmitted if, before the end of the spin, all the previous data have been sent. Thus the next spin of data will be transmitted slightly late, but all of its core data will be transmitted before the following spin of data is started on. Eventually the transmission will catch up and be able to transmit the distribution after the core again, but only after some time. This applies at all telemetry rates. The instrument can adapt automatically to six different telemetry rates: a basic 1.52 Kbps rate (CIS priority); a normal 2.52 Kbps rate; an enhanced PEACE priority rate of 3.54 Kbps; and three burst mode rates, with a maximum of 15.98 Kbps. For more details of the Cluster mission, the spacecraft, and its instruments, see the report Cluster: mission, payload and supporting activities, March 1993, ESA SP-1159, and the included article PEACE: a Plasma Electron and Current Experiment, by A. D. Johnstone et al., from which this information was obtained.

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Version:2.3.0

NumericalData

ResourceID
spase://ESA/NumericalData/Cluster/PEACE/SummaryParameter/PT60S
ResourceHeader
ResourceName
Cluster Summary Parameter Plasma Electron and Current Experiment (PEACE) Data
AlternateName
Cluster Summary Parameter PEACE Data
ReleaseDate
2020-07-03 23:28:58Z
Description

The primary task of this instrument (PEACE: Plasma Electrons and Currents Experiment) is to obtain the velocity moments of the distribution function of electrons as frequently and as accurately as the spacecraft telemetry will allow. Detector counts are collected in energy, polar-angle, and azimuth-angle bins to form a three-dimensional matrix. Two sensors are used: LEEA (low-energy electron analyzer) and HEEA (high-energy electron analyzer). The energy coverage is from 0.67 eV to 30 KeV in 92 levels. The first 16 levels are equally spaced linearly up to 10.7 eV; the remainder are logarithmically spaced. Both sensors can use the full range, but the HEEA will normally operate over a higher energy range than the LEEA. The LEEA specializes in coverage of the energies from 0.7-10 eV, and has a geometric factor one fifth that of the HEAA. Both sensors consist of hemispherical electrostatic analyzers of the top-hat type and a detector in the form of an annular micro-channel plate with a position-sensitive readout. Each sensor covers the range 0-180 degrees with respect to the spin axis, and they are mounted opposite each other with a view perpendicular to the spin axis, thus covering the complete angular range in a half rotation of the spacecraft. The field of view perpendicular to the fan is 2 degrees for the LEEA and 5.6 degrees for the HEEA. Energy resolution (Delta-E)/E is 0.13 for LEEA and 0.16 for HEEA. There are four sweep modes, synchronized to the spin period (4 s), to vary the azimuthal angular resolution. The spin phasing can be made coincident with that of the CIS instrument, to ensure that the electron and ion moments will be measured simultaneously. On-board processing is used to calculate the moments of the distribution with an accuracy of 1% and to select suitable parts of the complete distribution for transmission. The normal science data format is based on one spin period, and consists of core data followed by other optional distributions as can be fit into the available telemetry for that spin. The core data (moments, spacecraft potential, and pitch angle distribution) are always transmitted (if the spin is nominal). The next distribution is transmitted if, before the end of the spin, all the previous data have been sent. Thus the next spin of data will be transmitted slightly late, but all of its core data will be transmitted before the following spin of data is started on. Eventually the transmission will catch up and be able to transmit the distribution after the core again, but only after some time. This applies at all telemetry rates. The instrument can adapt automatically to six different telemetry rates: a basic 1.52 Kbps rate (CIS priority); a normal 2.52 Kbps rate; an enhanced PEACE priority rate of 3.54 Kbps; and three burst mode rates, with a maximum of 15.98 Kbps. For more details of the Cluster mission, the spacecraft, and its instruments, see the report Cluster: mission, payload and supporting activities, March 1993, ESA SP-1159, and the included article PEACE: a Plasma Electron and Current Experiment, by A. D. Johnstone et al., from which this information was obtained.

Acknowledgement
NASA, Dr. Andrew N. Fazakerley, European Space Agency
Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/Andrew.N.Fazakerley
2.CoInvestigatorspase://SMWG/Person/Duncan.A.Bryant
3.CoInvestigatorspase://SMWG/Person/Samuel.J.Bame
4.CoInvestigatorspase://SMWG/Person/J.David.Winningham
5.CoInvestigatorspase://SMWG/Person/Helmut.R.Rosenbauer
6.CoInvestigatorspase://SMWG/Person/Finn.Soraas
7.CoInvestigatorspase://SMWG/Person/Bernt.N.Maehlum
8.CoInvestigatorspase://SMWG/Person/Bengt.K.G.Hultqvist
9.CoInvestigatorspase://SMWG/Person/James.L.Burch
10.CoInvestigatorspase://SMWG/Person/Jean-Jacques.Berthelier
11.CoInvestigatorspase://SMWG/Person/David.S.Hall
12.CoInvestigatorspase://SMWG/Person/Melvyn.L.Goldstein
13.CoInvestigatorspase://SMWG/Person/Stein.Ullaland
14.CoInvestigatorspase://SMWG/Person/Risto.J.Pellinen
15.CoInvestigatorspase://SMWG/Person/Rickard.Lundin
16.CoInvestigatorspase://SMWG/Person/Oleg.L.Vaisberg
17.CoInvestigatorspase://SMWG/Person/David.A.Hardy
18.CoInvestigatorspase://SMWG/Person/Kristof.Stasiewicz
19.CoInvestigatorspase://SMWG/Person/R.Rajaram
20.CoInvestigatorspase://SMWG/Person/Denison.R.Lepine
21.CoInvestigatorspase://SMWG/Person/B.Narheim
22.CoInvestigatorspase://SMWG/Person/Michelle.F.Thomsen
23.CoInvestigatorspase://SMWG/Person/William.H.Matthaeus
24.CoInvestigatorspase://SMWG/Person/Jill.A.Marshall
25.CoInvestigatorspase://SMWG/Person/Bruce.L.Barraclough
26.CoInvestigatorspase://SMWG/Person/David.J.McComas
27.CoInvestigatorspase://SMWG/Person/Dominique.Fontaine
28.CoInvestigatorspase://SMWG/Person/Andrew.J.Coates
29.CoInvestigatorspase://SMWG/Person/David.M.Walton
30.CoInvestigatorspase://SMWG/Person/S.J.Schwartz
31.CoInvestigatorspase://SMWG/Person/G.S.Lakhina
32.CoInvestigatorspase://SMWG/Person/Andrej.I.Zakharov
33.MetadataContactspase://SMWG/Person/James.M.Weygand
InformationURL
Name
NSSDC Master Catalog listing for Cluster II Rumba Plasma Electron and Current Experiment (PEACE) Instrument
URL
Description

This site provides information concerning the Cluster II Rumba Plasma Electron and Current Experiment Instrument.

InformationURL
Name
NSSDC Master Catalog listing for Cluster II Salsa Plasma Electron and Current Experiment (PEACE) Instrument
URL
Description

This site provides information concerning the Cluster II Salsa Plasma Electron and Current Experiment Instrument.

InformationURL
Name
NSSDC Master Catalog listing for Cluster II Samba Plasma Electron and Current Experiment (PEACE) Instrument
URL
Description

This site provides information concerning the Cluster II Samba Plasma Electron and Current Experiment Instrument.

InformationURL
Name
NSSDC Master Catalog listing for Cluster II Tango Plasma Electron and Current Experiment (PEACE) Instrument
URL
Description

This site provides information concerning the Cluster II Tango Plasma Electron and Current Experiment Instrument.

Association
AssociationID
AssociationType
ObservedBy
Association
AssociationID
AssociationType
ObservedBy
Association
AssociationID
AssociationType
ObservedBy
Association
AssociationID
AssociationType
ObservedBy
PriorIDs
spase://VMO/NumericalData/Cluster2/PEACE/SummaryParameter/60S
spase://VMO/NumericalData/Cluster/PEACE/SummaryParameter/60S
spase://VSPO/NumericalData/Cluster/PEACE/SummaryParameter/PT60S
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description

Cluster II Summary Parameter Plasma Electron and Current Experiment (PEACE) data

AccessURL
Name
HTTPS from SPDF
URL
Description

In CDF via HTTP from SPDF

Format
CDF
Acknowledgement
NASA, Dr. Andrew N. Fazakerley
ProcessingLevel
Calibrated
ProviderResourceName
Cluster II Summary Parameter Plasma Electron and Current Experiment (PEACE) Data
ProviderProcessingLevel
Calibrated
ProviderVersion
1
InstrumentIDs
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
2001-01-01 00:00:00.000
RelativeStopDate
-P3M
Note
Time format in data files is: day, month, year hour, min, seconds. Ex: 01-Jan-1981 00:00:00.000
Cadence
PT60S
ObservedRegion
Earth.Magnetosheath
ObservedRegion
Earth.Magnetosphere
ObservedRegion
Earth.Magnetosphere.Magnetotail
ObservedRegion
Earth.Magnetosphere.Main
ObservedRegion
Earth.Magnetosphere.Polar
ObservedRegion
Earth.Magnetosphere.RadiationBelt
ObservedRegion
Earth.NearSurface.AuroralRegion
ObservedRegion
Earth.NearSurface.Ionosphere
ObservedRegion
Earth.NearSurface.Plasmasphere
ObservedRegion
Earth.NearSurface.PolarCap
ObservedRegion
Heliosphere.NearEarth
Keywords
60 second
magnetosphere
auroral region
polar cap
cusp
bow shock
solar wind
magnetosheath
Cluster
magnetotail
lobe
Parameter #1
Name
Half Sample Time Interval
ParameterKey
Half_interval__CL_SP_PEA
Description

Half the mean separation between time tags, averaged over the file

Cadence
PT60S
Units
ms
UnitsConversion
1.0e-3>s
FillValue
-1.0000e+31
Support
SupportQuantity
Other
Parameter #2
Name
Universal Time
ParameterKey
Epoch__CL_SP_PEA
Description

Universal Time in data cell: day, month, year hour, min, seconds. Ex: 01-Jan-1981 00:00:00.000.

Cadence
PT60S
Units
ms
UnitsConversion
1.0e-3>s
RenderingHints
AxisLabel
Epoch
FillValue
-1.0000e+31
Support
SupportQuantity
Temporal
Parameter #3
Name
Status
ParameterKey
Status__CL_SP_PEA
Description

Cluster II Summary Parameter Plasma Electron and Current Experiment status

Cadence
PT60S
ValidMin
0
ValidMax
255
FillValue
255
Support
SupportQuantity
Other
Parameter #4
Name
Electron Number Density
ParameterKey
N_e_den__CL_SP_PEA
Description

Cluster II Summary Parameter Plasma Electron and Current Experiment electron number density

Cadence
PT60S
Units
cm^-3
UnitsConversion
1.0e6>m^-3
RenderingHints
AxisLabel
Ne
ScaleMin
0.1000
ScaleMax
1000
ValidMin
0.1000
ValidMax
1000
FillValue
-1.0000e+31
Particle
ParticleType
Electron
Qualifier
Scalar
ParticleQuantity
NumberDensity
Parameter #5
Name
Electron Velocity
ParameterKey
V_e_xyz_gse__CL_SP_PEA
Description

Cluster II Summary Parameter Plasma Electron and Current Experiment electron velocity

Cadence
PT60S
Units
km/s
UnitsConversion
1.0e3>m s^-1
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
RenderingHints
ScaleMin
-1000
ScaleMax
1000
Structure
Size
3
Element
Name
Vx GSE
Qualifier
Component.I
Index
1
Element
Name
Vy GSE
Qualifier
Component.J
Index
2
Element
Name
Vz GSE
Qualifier
Component.K
Index
3
ValidMin
-10000
ValidMax
10000
FillValue
-1.0000e+31
Particle
ParticleType
Electron
Qualifier
Vector
ParticleQuantity
Velocity
Parameter #6
Name
Parallel Electron Temperature
ParameterKey
T_e_par__CL_SP_PEA
Description

Cluster II Summary Parameter Plasma Electron and Current Experiment parallel electron temperature

Cadence
PT60S
Units
MK
UnitsConversion
1.0e6>K
RenderingHints
AxisLabel
Te_par
ScaleMin
0.0100
ScaleMax
1000
ValidMin
0.0100
ValidMax
350
FillValue
-1.0000e+31
Particle
ParticleType
Electron
Qualifier
Scalar
ParticleQuantity
Temperature
Parameter #7
Name
Perpendicular Electron Temperature
ParameterKey
T_e_perp__CL_SP_PEA
Description

Cluster II Summary Parameter Plasma Electron and Current Experiment perpendicular electron temperature

Cadence
PT60S
Units
MK
UnitsConversion
1.0e6>K
RenderingHints
AxisLabel
Te_perp
ScaleMin
0.0100
ScaleMax
1000
ValidMin
0.0100
ValidMax
350
FillValue
-1.0000e+31
Particle
ParticleType
Electron
Qualifier
Scalar
ParticleQuantity
Temperature
Parameter #8
Name
Parallel Electron Heat Flux
ParameterKey
Q_e_par__CL_SP_PEA
Description

Cluster II Summary Parameter Plasma Electron and Current Experiment parallel electron heat flux

Cadence
PT60S
Units
uJ m^-2 s^-1
UnitsConversion
1.0e-6>J m^-2 s^-1
RenderingHints
AxisLabel
Qe_para
ScaleMin
0.0100
ScaleMax
100000
ValidMin
0.0100
ValidMax
100000
FillValue
-1.0000e+31
Particle
ParticleType
Electron
Qualifier
Scalar
ParticleQuantity
HeatFlux