2.2.6
spase://CDPP/NumericalData/AMDA/Cluster/Cluster3/PEACE/clust3-pea-mom
electron moments
Cluster 3 Prime Parameter PEACE Data
2015-10-19T15:51:44Z
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.
NASA, Dr. Andrew N. Fazakerley, European Space Agency
spase://SMWG/Person/Elena.Budnik
TechnicalContact
NSSDC Master Catalog listing for Cluster II Rumba Plasma Electron and Current Experiment (PEACE)
http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=2000-045A-05
This site provides information concerning the Cluster II Rumba Plasma Electron and Current Experiment Instrument.
spase://SMWG/Repository/CDPP/AMDA
Online
Open
AMDA at CDPP
http://amda.cdpp.eu
NetCDF
NASA, Dr. Andrew N. Fazakerley
CSA
Calibrated
Cluster II Samba Prime Parameter Plasma Electron and Current Experiment (PEACE) Data
Calibrated
spase://CDPP/Instrument/AMDA/Cluster-Samba/PEACE
ThermalPlasma
2001-01-09T15:15:12Z
2013-06-30T23:59:39Z
PT4S
PT160S
Earth.Magnetosheath
Earth.Magnetosphere
Earth.Magnetosphere.Magnetotail
Earth.Magnetosphere.Main
Earth.Magnetosphere.Polar
Earth.Magnetosphere.RadiationBelt
Earth.NearSurface.AuroralRegion
Earth.NearSurface.Ionosphere
Earth.NearSurface.Plasmasphere
Earth.NearSurface.PolarCap
Heliosphere.NearEarth
4 second
magnetosphere
auroral region
polar cap
cusp
bow shock
solar wind
magnetosheath
Cluster
magnetotail
lobe
density
c3_pea_dens
Cluster II Samba Prime Parameter Plasma Electron and Current Experiment electron number density at spin time resolution
phys.density;phys.electron
PT4S
cm^-3
1.0e6>m^-3
TimeSeries
Ne
0.1000
1000
0.1000
1000
-1.0000e+31
Electron
Scalar
NumberDensity
v_gse
c3_pea_vgse
Cluster II Samba Prime Parameter Plasma Electron and Current Experiment electron velocity at spin time resolution
phys.veloc;phys.electron
PT4S
km/s
1.0e3>m s^-1
Cartesian
GSE
TimeSeries
-1000
1000
3
vx
Component.I
1
c3_pea_vgse(0)
vy
Component.J
2
c3_pea_vgse(1)
vz
Component.K
3
c3_pea_vgse(2)
-10000
10000
-1.0000e+31
Electron
Vector
Velocity
v_gsm
c3_pea_vgsm
Cluster II Samba Prime Parameter Plasma Electron and Current Experiment electron velocity at spin time resolution
phys.veloc;phys.electron
PT4S
km/s
1.0e3>m s^-1
Cartesian
GSM
TimeSeries
-1000
1000
3
vx
Component.I
1
c3_pea_vgsm(0)
vy
Component.J
2
c3_pea_vgsm(1)
vz
Component.K
3
c3_pea_vgsm(2)
-10000
10000
-1.0000e+31
Electron
Vector
Velocity
v_para_gse
c3_pea_vpar
Cluster II Samba Prime Parameter Plasma Electron and Current Experiment electron velocity at spin time resolution
phys.veloc;phys.electron
PT4S
km/s
1.0e3>m s^-1
Cartesian
GSE
TimeSeries
-1000
1000
3
vx
Component.I
1
c3_pea_vpar(0)
vy
Component.J
2
c3_pea_vpar(1)
vz
Component.K
3
c3_pea_vpar(2)
-10000
10000
-1.0000e+31
Electron
Vector
Velocity
v_para_gsm
c3_pea_vpar_gsm
Cluster II Samba Prime Parameter Plasma Electron and Current Experiment electron velocity at spin time resolution
phys.veloc;phys.electron
PT4S
km/s
1.0e3>m s^-1
Cartesian
GSM
TimeSeries
-1000
1000
3
vx
Component.I
1
c3_pea_vpar_gsm(0)
vy
Component.J
2
c3_pea_vpar_gsm(1)
vz
Component.K
3
c3_pea_vpar_gsm(2)
-10000
10000
-1.0000e+31
Electron
Vector
Velocity
v_perp_gse
c3_pea_vperp
Cluster II Samba Prime Parameter Plasma Electron and Current Experiment electron velocity at spin time resolution
phys.veloc;phys.electron
PT4S
km/s
1.0e3>m s^-1
Cartesian
GSE
TimeSeries
-1000
1000
3
vx
Component.I
1
c3_pea_vperp(0)
vy
Component.J
2
c3_pea_vperp(1)
vz
Component.K
3
c3_pea_vperp(2)
-10000
10000
-1.0000e+31
Electron
Vector
Velocity
v_perp_gsm
c3_pea_vperp_gsm
Cluster II Samba Prime Parameter Plasma Electron and Current Experiment electron velocity at spin time resolution
phys.veloc;phys.electron
PT4S
km/s
1.0e3>m s^-1
Cartesian
GSM
TimeSeries
-1000
1000
3
vx
Component.I
1
c3_pea_vperp_gsm(0)
vy
Component.J
2
c3_pea_vperp_gsm(1)
vz
Component.K
3
c3_pea_vperp_gsm(2)
-10000
10000
-1.0000e+31
Electron
Vector
Velocity
heat_flux_gse
c3_pea_flux
Cluster II Samba Prime Parameter Plasma Electron and Current Experiment parallel electron heat flux at spin time resolution
phys.heatflux;phys.atmol.ionStage
PT4S
microW/m^2
TimeSeries
3
flux_x
1
c3_pea_flux(0)
flux_y
1
c3_pea_flux(1)
flux_z
1
c3_pea_flux(2)
Electron
Vector
HeatFlux
pressure_gse
c3_pea_press
Cluster II Samba Prime Parameter Plasma Electron and Current Experiment parallel pressure tensor at spin time resolution
phys.pressure
PT4S
microW/m^2
Cartesian
GSE
TimeSeries
3
xx
1
c3_pea_press(0)
yy
2
c3_pea_press(4)
zz
3
c3_pea_press(8)
Electron
Tensor
Pressure
t_para
c3_pea_tpar
Cluster II Samba Prime Parameter Plasma Electron and Current Experiment parallel electron temperature at spin time resolution
phys.temperature;phys.electron
PT4S
eV
TimeSeries
-1.0000e+31
Electron
Scalar
Temperature
t_perp
c3_pea_tperp
Cluster II Samba Prime Parameter Plasma Electron and Current Experiment perpendicular electron temperature at spin time resolution
phys.temperature;phys.electron
PT4S
eV
TimeSeries
-1.0000e+31
Electron
Scalar
Temperature