Version:2.2.9
NumericalData
ResourceID
spase://NASA/NumericalData/AMPTE-IRM/Plasma/PT4.4S
ResourceHeader
ResourceName
AMPTE-IRM Plasma Data
ReleaseDate
2020-07-07 21:14:16Z
Description
AMPT-IRM spin-averaged plasma moments at ~4.4 second resolution.
Acknowledgement
User will acknowledge the AMPTE-IRM 3-D Plasma Analyser team in any publication resulting from the use of these data.
Contacts
InformationURL
Name
AMPTE/IRM page at University of New Hampshire
URL
Description
Information on the AMPTE/IRM data
PriorIDs
spase://VMO/NumericalData/AMPTE_IRM/Plasma/PT4.4S
spase://VMO/NumericalData/AMPTE-IRM/Plasma/PT4.4S
spase://VSPO/NumericalData/AMPTE-IRM/Plasma/PT4.4S
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
AMPTE/IRM Data
URL
Description
A web-accessible directory hosting AMPTE/IRM spin-averaged magnetic field and plasma data.
Format
Text
Encoding
ASCII
InstrumentIDs
MeasurementType
Ephemeris
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
1984-08-22 12:58:03
StopDate
1986-08-11 21:32:28
Cadence
PT4.4S
ObservedRegion
Earth.Magnetosheath
ObservedRegion
Earth.Magnetosphere
ObservedRegion
Earth.Magnetosphere.Magnetotail
ObservedRegion
Heliosphere.NearEarth
Caveats
The only moment which should be used in the solar wind is proton bulk velocity.
The spin period changed from ~4.3s to ~4.7s during the mission.
IRM time stamps are UT at time of ground receipt. Thus for time-critical science, the IRM times need to be corrected by subtracting the light travel time from the spacecraft to the ground-station (at Weilheim in Germany apart special events requiring NASA DSN). For the transmission frequencies used, the vacuum light speed is appropriate. At apogee, this correction is more than a third of a second. There are no other known time delays.
Parameter #1
Name
Time
ParameterKey
Column 1
Description
The center of the accumulation time interval for the data point, in DA/MO/YR HR:MI:SS format.
Support
Parameter #2
Name
DT
ParameterKey
Column 2
Description
The accumulation time for the measurement, normally one spin
Units
s
Support
Parameter #3
Name
Xgse
ParameterKey
Column 3
Description
The X component of spacecraft location in GSE, in Re (Re=6378 km)
Units
Re
UnitsConversion
6.378e6>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
1
Element
Name
Xgse
Qualifier
Component.I
Index
1
Support
SupportQuantity
Positional
Parameter #4
Name
Ygse
ParameterKey
Column 4
Description
The Y component of spacecraft location in GSE, in Re (Re=6378 km)
Units
Re
UnitsConversion
6.378e6>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
1
Element
Name
Ygse
Qualifier
Component.J
Index
1
Support
SupportQuantity
Positional
Parameter #5
Name
Zgse
ParameterKey
Column 5
Description
The Z component of spacecraft location in GSE, in Re (Re=6378 km)
Units
Re
UnitsConversion
6.378e6>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
1
Element
Name
Zgse
Qualifier
Component.K
Index
1
Support
SupportQuantity
Positional
Parameter #6
Name
Rgse
ParameterKey
Column 6
Description
Radial distance in SM, in Re (Re=6378 km)
Units
Re
UnitsConversion
6.378e6>m
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
SM
Support
Qualifier
Magnitude
SupportQuantity
Positional
Parameter #7
Name
MLAT
ParameterKey
Column 7
Description
Magnetic latitude in SM, in degrees
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
SM
Support
Qualifier
DirectionAngle.ElevationAngle
SupportQuantity
Positional
Parameter #8
Name
MLT
ParameterKey
Column 8
Description
Magnetic Local Time in SM, in hours
Units
hour
UnitsConversion
15>deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
SM
Support
Qualifier
DirectionAngle.AzimuthAngle
SupportQuantity
Positional
Parameter #9
Name
Np
ParameterKey
Column 9
Description
Number density of protons
Units
cm^-3
UnitsConversion
1e6>m^-3
Particle
ParticleType
Proton
Qualifier
Moment
Qualifier
Scalar
ParticleQuantity
NumberDensity
Parameter #10
Name
Vp
Description
Units
km/s
UnitsConversion
1.0e3>m/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
3
Element
Name
Vx_p
Qualifier
Component.I
Index
1
ParameterKey
Column 10
Element
Name
Vy_p
Qualifier
Component.J
Index
2
ParameterKey
Column 11
Element
Name
Vz_p
Qualifier
Component.K
Index
3
ParameterKey
Column 12
Particle
ParticleType
Proton
Qualifier
Moment
Qualifier
Vector
ParticleQuantity
Velocity
Parameter #11
Name
Tp
ParameterKey
Column 13
Description
Units
MK
UnitsConversion
1e6>K
Particle
ParticleType
Proton
Qualifier
Moment
Qualifier
Scalar
ParticleQuantity
Temperature
Parameter #12
Name
Ne
ParameterKey
Column 14
Description
Number density of electrons
Units
cm^-3
UnitsConversion
1e6>m^-3
Particle
ParticleType
Electron
Qualifier
Moment
Qualifier
Scalar
ParticleQuantity
NumberDensity
Parameter #13
Name
Ve
Description
Caveats
The electron velocity is rarely correct, due to photoeletrons and/or missing real electrons at low energies. Please do not use for quantitative work.
Units
km/s
UnitsConversion
1.0e3>m/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
3
Element
Name
Vx_e
Qualifier
Component.I
Index
1
ParameterKey
Column 15
Element
Name
Vy_e
Qualifier
Component.J
Index
2
ParameterKey
Column 16
Element
Name
Vz_e
Qualifier
Component.K
Index
3
ParameterKey
Column 17
Particle
ParticleType
Electron
Qualifier
Moment
Qualifier
Vector
ParticleQuantity
Velocity
Parameter #14
Name
Te
ParameterKey
Column 18
Description
Units
MK
UnitsConversion
1e6>K
Particle
ParticleType
Electron
Qualifier
Moment
Qualifier
Scalar
ParticleQuantity
Temperature