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Cluster Summary Parameter Electric Field and Waves (EFW) Data

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

Description

The EFW (Electric Field and Waves) instrument consists of four orthogonal spherical sensors deployed from 50 m cable booms in the spin plane of the spacecraft, plus four deployment units and a main electronics unit. Each deployment unit deploys a multiconductor cable and tip-mounted spherical sensor. Each opposing pair of cables will be symmetrically deployed to a tip-to-tip distance of approximately 100 m, except for about a week at the beginning of the mission when 70 m will be used for one boom pair (the Z-booms) and 100 m for the other pair. The potentials of the spherical sensor and nearby conductors are controlled by the microprocessor to minimize errors associated with photoelectron fluxes to and from the spheres. Output signals from the sensor preamplifiers are provided to the wave instruments for analysis of high frequency wave phenomena. There is a 1 MB burst memory and tow fast A/D conversion circuits for recording electric field wave forms for time resolutions of up to 36,000 samples/s. Data gathered in the burst memory will be played back through the telemetry stream allocated to the instrument by pre-empting a portion of the real-time data. Incoming data are continuously monitored by algorithms in the software to determine whether to trigger the burst-playback mode. A large number of sampling modes is possible, yielding four possible telemetry rates from 1.440-29.440 Kbps. This data stream is transferred via the DWP instrument. The main measured quantities will be, in various modes: (1) the instantaneous spin-plane components of the electric field vector, from 0.1-700 V/Km, with time resolution down to 0.1 ms, in four frequency ranges from DC to upper limits of 10 Hz, 180 Hz, 4 KHz, or 32 KHz; (2) the AC electric field components from 10 Hz to 8 KHz, within the dynamic range of ~3 mV/Km to 10 V/Km; (3) plasma density fluctuations within the range of 1-100/cm and in three frequency ranges from 0 Hz to upper limits of 10 Hz, 180 Hz, or 4 KHz; and, (4) density and temperature (in Langmuir sweeps) in the eV range, with a dynamic range of 1-100/cm. There is also a frequency counter covering the range 10-200 KHz. On-board calculations of least-square fits to the electric field data over one spacecraft spin period (4 s) will provide a baseline of high-quality two-dimensional electric field components that are present in the telemetry stream, except for periods when three or four sensors are in current mode. The spacecraft potential is calculated and transmitted via DWP to other instruments on board. The three components from the search coil instrument (WHISPER) are also available in EFW with a bandwidth of 4 KHz. 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 The Spherical Probe Electric Field and Waves experiment for the Cluster Mission, by G. Gustafsson et al., from which this information was obtained.

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Version:2.3.0

NumericalData

ResourceID
spase://ESA/NumericalData/Cluster/EFW/SummaryParameter/PT60S
ResourceHeader
ResourceName
Cluster Summary Parameter Electric Field and Waves (EFW) Data
AlternateName
Cluster Summary Parameter EFW Data
ReleaseDate
2020-07-03 23:28:58Z
Description

The EFW (Electric Field and Waves) instrument consists of four orthogonal spherical sensors deployed from 50 m cable booms in the spin plane of the spacecraft, plus four deployment units and a main electronics unit. Each deployment unit deploys a multiconductor cable and tip-mounted spherical sensor. Each opposing pair of cables will be symmetrically deployed to a tip-to-tip distance of approximately 100 m, except for about a week at the beginning of the mission when 70 m will be used for one boom pair (the Z-booms) and 100 m for the other pair. The potentials of the spherical sensor and nearby conductors are controlled by the microprocessor to minimize errors associated with photoelectron fluxes to and from the spheres. Output signals from the sensor preamplifiers are provided to the wave instruments for analysis of high frequency wave phenomena. There is a 1 MB burst memory and tow fast A/D conversion circuits for recording electric field wave forms for time resolutions of up to 36,000 samples/s. Data gathered in the burst memory will be played back through the telemetry stream allocated to the instrument by pre-empting a portion of the real-time data. Incoming data are continuously monitored by algorithms in the software to determine whether to trigger the burst-playback mode. A large number of sampling modes is possible, yielding four possible telemetry rates from 1.440-29.440 Kbps. This data stream is transferred via the DWP instrument. The main measured quantities will be, in various modes: (1) the instantaneous spin-plane components of the electric field vector, from 0.1-700 V/Km, with time resolution down to 0.1 ms, in four frequency ranges from DC to upper limits of 10 Hz, 180 Hz, 4 KHz, or 32 KHz; (2) the AC electric field components from 10 Hz to 8 KHz, within the dynamic range of ~3 mV/Km to 10 V/Km; (3) plasma density fluctuations within the range of 1-100/cm and in three frequency ranges from 0 Hz to upper limits of 10 Hz, 180 Hz, or 4 KHz; and, (4) density and temperature (in Langmuir sweeps) in the eV range, with a dynamic range of 1-100/cm. There is also a frequency counter covering the range 10-200 KHz. On-board calculations of least-square fits to the electric field data over one spacecraft spin period (4 s) will provide a baseline of high-quality two-dimensional electric field components that are present in the telemetry stream, except for periods when three or four sensors are in current mode. The spacecraft potential is calculated and transmitted via DWP to other instruments on board. The three components from the search coil instrument (WHISPER) are also available in EFW with a bandwidth of 4 KHz. 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 The Spherical Probe Electric Field and Waves experiment for the Cluster Mission, by G. Gustafsson et al., from which this information was obtained.

Acknowledgement
NASA, Georg Gustafsson
Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/Georg.Gustafsson
2.CoInvestigatorspase://SMWG/Person/Arne.Pedersen
3.CoInvestigatorspase://SMWG/Person/Les.J.C.Woolliscroft
4.CoInvestigatorspase://SMWG/Person/Thomas.L.Aggson
5.CoInvestigatorspase://SMWG/Person/Alv.A.Egeland
6.CoInvestigatorspase://SMWG/Person/Forrest.S.Mozer
7.CoInvestigatorspase://SMWG/Person/Donald.A.Gurnett
8.CoInvestigatorspase://SMWG/Person/Rolf.Bostrom
9.CoInvestigatorspase://SMWG/Person/Carle-Gunne.Falthammar
10.CoInvestigatorspase://SMWG/Person/Lars.Peter.Block
11.CoInvestigatorspase://SMWG/Person/Paul.J.Kellogg
12.CoInvestigatorspase://SMWG/Person/Eivind.V.Thrane
13.CoInvestigatorspase://SMWG/Person/Nelson.C.Maynard
14.CoInvestigatorspase://SMWG/Person/Jan.A.Holtet
15.CoInvestigatorspase://SMWG/Person/Christopher.C.Harvey
16.CoInvestigatorspase://SMWG/Person/Rejean.J.L.Grard
17.CoInvestigatorspase://SMWG/Person/Pekka.J.Tanskanen
18.CoInvestigatorspase://SMWG/Person/Paul.M.Kintner
19.CoInvestigatorspase://SMWG/Person/Bengt.Holback
20.CoInvestigatorspase://SMWG/Person/Gunnar.Holmgren
21.CoInvestigatorspase://SMWG/Person/Alain.Roux
22.CoInvestigatorspase://SMWG/Person/Cynthia.A.Cattell
23.CoInvestigatorspase://SMWG/Person/Kristof.Stasiewicz
24.CoInvestigatorspase://SMWG/Person/Pierrette.Decreau
25.CoInvestigatorspase://SMWG/Person/Michael.Smiddy
26.CoInvestigatorspase://SMWG/Person/John.R.Wygant
27.CoInvestigatorspase://SMWG/Person/Per-Arne.Lindqvist
28.CoInvestigatorspase://SMWG/Person/Howard.J.Singer
29.CoInvestigatorspase://SMWG/Person/Michael.A.Temerin
30.CoInvestigatorspase://SMWG/Person/Robert.F.Pfaff
31.CoInvestigatorspase://SMWG/Person/Jean-Pierre.Lebreton
32.CoInvestigatorspase://SMWG/Person/Stanislav.I.Klimov
33.CoInvestigatorspase://SMWG/Person/Goran.T.Marklund
34.CoInvestigatorspase://SMWG/Person/Robert.Manning
35.CoInvestigatorspase://SMWG/Person/Ilan.Roth
36.CoInvestigatorspase://SMWG/Person/Rudolf.J.Schmidt
37.CoInvestigatorspase://SMWG/Person/Kalevi.Mursula
38.MetadataContactspase://SMWG/Person/James.M.Weygand
InformationURL
Name
NSSDC Master Catalog listing for Cluster II Rumba Electric Field and Waves (EFW)
URL
Description

This site provides information concerning the Cluster II Rumba Electric Field and Waves Instrument.

InformationURL
Name
NSSDC Master Catalog listing for Cluster II Salsa Electric Field and Waves (EFW)
URL
Description

This site provides information concerning the Cluster II Salsa Electric Field and Waves Instrument.

InformationURL
Name
NSSDC Master Catalog listing for Cluster II Samba Electric Field and Waves (EFW)
URL
Description

This site provides information concerning the Cluster II Samba Electric Field and Waves Instrument.

InformationURL
Name
NSSDC Master Catalog listing for Cluster II Tango Electric Field and Waves (EFW)
URL
Description

This site provides information concerning the Cluster II Tango Electric Field and Waves Instrument.

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

Cluster II Summary Parameter Electric Field and Waves (EFW) Data

AccessURL
Name
HTTPS from SPDF
URL
Description

In CDF via HTTP from SPDF

Format
CDF
Acknowledgement
NASA, Georg Gustafsson
ProcessingLevel
Calibrated
ProviderResourceName
Cluster II Summary Parameter Electric Field and Waves (EFW) Data
ProviderProcessingLevel
Calibrated
ProviderVersion
1
InstrumentIDs
MeasurementType
ElectricField
MeasurementType
Waves.Passive
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_EFW
Description

Half width of measurement interval

Cadence
PT60S
Units
ms
FillValue
-1.0000e+31
Support
SupportQuantity
Other
Parameter #2
Name
Universal Time
ParameterKey
Epoch__CL_SP_EFW
Description

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

Caveats
Interval centered time tag
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_EFW
Description

Cluster II Summary Parameter Electric Field and Waves status

Cadence
PT60S
ValidMin
0
ValidMax
255
FillValue
255
Support
SupportQuantity
Other
Parameter #4
Name
Wave Experiment Consortium (WEC) Status
ParameterKey
State_wec__CL_SP_EFW
Description

Cluster II Summary Parameter Electric Field and Waves Wave Experiment Consortium (WEC) status

Cadence
PT60S
ValidMin
0
ValidMax
255
FillValue
255
Support
SupportQuantity
Other
Parameter #5
Name
Duskward Electric Field
ParameterKey
E_dusk__CL_SP_EFW
Description

Cluster II Summary Parameter Electric Field and Waves duskward electric field

Cadence
PT60S
Units
mV/m
UnitsConversion
1.0e-3>V m^-1
RenderingHints
AxisLabel
E_dusk
ScaleMin
-20
ScaleMax
20
ValidMin
-700
ValidMax
700
FillValue
-1.0000e+31
Field
Qualifier
Scalar
FieldQuantity
Electric
Parameter #6
Name
F1 Band Spectral Density
ParameterKey
E_pow_f1__CL_SP_EFW
Description

Cluster II Summary Parameter Electric Field and Waves f1 band spectral density

Cadence
PT60S
Units
V^2 m^-2 Hz^-1
UnitsConversion
1.0>V^2 m^-2 Hz^-1
RenderingHints
AxisLabel
E_pow_f1
ScaleMin
1.0000e-12
ScaleMax
1.0000e-4
ValidMin
1.0000e-13
ValidMax
0.0010
FillValue
-1.0000e+31
Field
Qualifier
Scalar
Qualifier
Spectral
FieldQuantity
Electric
FrequencyRange
Low
1
High
10
Units
Hz
Parameter #7
Name
F2 Band Spectral Density
ParameterKey
E_pow_f2__CL_SP_EFW
Description

Cluster II Summary Parameter Electric Field and Waves f2 band spectral density

Cadence
PT60S
Units
V^2 m^-2 Hz^-1
UnitsConversion
1.0>V^2 m^-2 Hz^-1
RenderingHints
AxisLabel
E_pow_f2
ScaleMin
1.0000e-13
ScaleMax
1.0000e-5
ValidMin
1.0000e-13
ValidMax
1.0000e-4
FillValue
-1.0000e+31
Field
Qualifier
Spectral
Qualifier
Scalar
FieldQuantity
Electric
FrequencyRange
Low
10
High
180
Units
Hz
Parameter #8
Name
Electric Field Variation
ParameterKey
E_sigma__CL_SP_EFW
Description

Cluster II Summary Parameter Electric Field and Waves electric field variation

Cadence
PT60S
Units
mV/m
UnitsConversion
1.0e-3>V m^-1
RenderingHints
AxisLabel
E_sigma
ScaleMin
0
ScaleMax
40
ValidMin
0
ValidMax
700
FillValue
-1.0000e+31
Field
Qualifier
Scalar
FieldQuantity
Electric
Parameter #9
Name
Probe Current
ParameterKey
I_probe__CL_SP_EFW
Description

Cluster II Summary Parameter Electric Field and Waves probe current

Cadence
PT60S
Units
uA
UnitsConversion
1.0e-6>A
RenderingHints
AxisLabel
I_probe
ScaleMin
0.1000
ScaleMax
2000
ValidMin
0.0010
ValidMax
2000
FillValue
-1.0000e+31
Field
Qualifier
Scalar
FieldQuantity
Current
Parameter #10
Name
Probe Potential
ParameterKey
U_probe_sc__CL_SP_EFW
Description

Cluster II Summary Parameter Electric Field and Waves probe potential

Cadence
PT60S
Units
V
UnitsConversion
1.0>V
RenderingHints
AxisLabel
U_probe_sc
ScaleMin
-60
ScaleMax
0
ValidMin
-75
ValidMax
25
FillValue
-1.0000e+31
Field
Qualifier
Scalar
FieldQuantity
Potential