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TWINS 1 - Spacecraft Ephemeris

ResourceID
spase://NASA/NumericalData/TWINS1/Ephemeris/PT1M45S

Description

Definitive orbit data

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Details

Version:2.3.2

NumericalData

ResourceID
spase://NASA/NumericalData/TWINS1/Ephemeris/PT1M45S
ResourceHeader
ResourceName
TWINS 1 - Spacecraft Ephemeris
ReleaseDate
2021-04-27 15:38:11Z
Description

Definitive orbit data

Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/David.J.McComas
2.MetadataContactspase://SMWG/Person/Jan.Merka
InformationURL
PriorIDs
spase://VMO/NumericalData/TWINS1/Ephemeris/PT1M45S
spase://VSPO/NumericalData/TWINS1/Ephemeris/PT1M45S
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description

NASA/GSFC CDAWeb ftp access to the data.

AccessURL
Name
HTTPS from SPDF
URL
Description

In CDF via HTTP from CDAWeb

Format
CDF
Encoding
None
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb
URL
ProductKey
TWINS1_OR_DEF
Description

TWINS 1 spacecraft ephemeris data with subset, plot, list functionalities
from CDAWeb

AccessURL
Format
Text
Acknowledgement
Please acknowledge the CDAWeb team at GSFC/SPDF.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
TWINS1_OR_DEF
Description

Web Service to this product using the HAPI interface.

Format
CSV
Acknowledgement
Please acknowledge the CDAWeb team at GSFC/SPDF.
InstrumentIDs
MeasurementType
Ephemeris
TemporalDescription
TimeSpan
StartDate
2001-04-01 00:01:03.75Z
RelativeStopDate
-P10D
Cadence
PT1M45S
ObservedRegion
Earth.Magnetosphere
Parameter #1
Name
Epoch
ParameterKey
Epoch
Description

Epoch

FillValue
31-Dec-9999 23:59:59.999
Support
SupportQuantity
Temporal
Parameter #2
Name
Start Time MJD
ParameterKey
ISTARTTIMEMJD
Description

Start Time MJD - time key of data point

Units
days
FillValue
-1.0E31
Support
SupportQuantity
Temporal
Parameter #3
Name
S/C ECI XYZ
ParameterKey
FSCECI
Description

The spacecraft location in ECI coordinates (cartesian XYZ components).

Units
km
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GEI
Structure
Size
3
Element
Name
FSCECI X
Qualifier
Component.I
Index
1
Element
Name
FSCECI Y
Qualifier
Component.J
Index
2
Element
Name
FSCECI Z
Qualifier
Component.K
Index
3
ValidMin
-63800.0
ValidMax
63800.0
FillValue
-1.0E31
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #4
Name
S/C GEO XYZ
ParameterKey
FSCGEO
Description

The spacecraft location in geographic coordinates (cartesian XYZ components).

Units
km
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GEO
Structure
Size
3
Element
Name
FSCGEO X
Qualifier
Component.I
Index
1
Element
Name
FSCGEO Y
Qualifier
Component.J
Index
2
Element
Name
FSCGEO Z
Qualifier
Component.K
Index
3
ValidMin
-63800.0
ValidMax
63800.0
FillValue
-1.0E31
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #5
Name
S/C GSM XYZ
ParameterKey
FSCGSM
Description

The spacecraft location in GSM coordinates (cartesian XYZ components).

Units
km
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Element
Name
FSCGSM X
Qualifier
Component.I
Index
1
Element
Name
FSCGSM Y
Qualifier
Component.J
Index
2
Element
Name
FSCGSM Z
Qualifier
Component.K
Index
3
ValidMin
-63800.0
ValidMax
63800.0
FillValue
-1.0E31
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #6
Name
S/C ECD XYZ
ParameterKey
FSCECD
Description

Spacecraft Eccentric Dipole Cartesian Coordinate XYZ

Caveats
The spacecraft location in eccentric dipole coordinates (cartesian XYZ components).
Units
km
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
ECD
Structure
Size
3
Element
Name
FSCECD X
Qualifier
Component.I
Index
1
Element
Name
FSCECD Y
Qualifier
Component.J
Index
2
Element
Name
FSCECD Z
Qualifier
Component.K
Index
3
ValidMin
-63800.0
ValidMax
63800.0
FillValue
-1.0E31
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #7
Name
S/C GEO Long
ParameterKey
FSCLONGGEO
Description

Spacecraft longitude (east longitude) in geographic coordinates.

Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GEO
ValidMin
0.0
ValidMax
360.0
FillValue
-1.0E31
Support
Qualifier
DirectionAngle.AzimuthAngle
SupportQuantity
Positional
Parameter #8
Name
S/C GEO Lat
ParameterKey
FSCLATGEO
Description

Spacecraft latitude in geographic coordinates.

Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GEO
ValidMin
-90.0
ValidMax
90.0
FillValue
-1.0E31
Support
Qualifier
DirectionAngle.ElevationAngle
SupportQuantity
Positional
Parameter #9
Name
S/C Radial Dist
ParameterKey
FSCRADIALDIST
Description

Spacecraft radial distance (km) from the center of the Earth.

Units
km
ValidMin
6380.0
ValidMax
63800.0
FillValue
-1.0E31
Support
Qualifier
Magnitude
SupportQuantity
Positional
Parameter #10
Name
S/C Radial Alt
ParameterKey
FSCRADIALALT
Description

Spacecraft radial altitude (km) based on an oblate spheroid Earth model (WGS84).

Units
km
ValidMin
0.0
ValidMax
57420.0
FillValue
-1.0E31
Support
SupportQuantity
Positional
Parameter #11
Name
Sun ECI XYZ
ParameterKey
FSUNECI
Description

The location of the Sun in ECI coordinates (cartesian XYZ components).

Units
km
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GEI
Structure
Size
3
Element
Name
FSUNECI X
Qualifier
Component.I
Index
1
Element
Name
FSUNECI Y
Qualifier
Component.J
Index
2
Element
Name
FSUNECI Z
Qualifier
Component.K
Index
3
ValidMin
-1.5E8
ValidMax
1.5E8
FillValue
-1.0E31
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #12
Name
B ECI XYZ
ParameterKey
FBECI
Description

The magnetic field vector in ECI coordinates (cartesian XYZ components).

Units
nT
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GEI
Structure
Size
3
Element
Name
FBECI X
Qualifier
Component.I
Index
1
Element
Name
FBECI Y
Qualifier
Component.J
Index
2
Element
Name
FBECI Z
Qualifier
Component.K
Index
3
ValidMin
-32000.0
ValidMax
32000.0
FillValue
-1.0E31
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #13
Name
B Mirror
ParameterKey
FBMIRROR
Description

The magnetic field magnitude at the spacecraft mirror point based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
nT
ValidMin
0.0
ValidMax
32000.0
FillValue
-1.0E31
Field
Qualifier
Magnitude
FieldQuantity
Magnetic
Parameter #14
Name
B Equatorial
ParameterKey
FBEQUATORIAL
Description

The magnetic field magnitude at the field-line minimum point based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
nT
ValidMin
0.0
ValidMax
32000.0
FillValue
-1.0E31
Field
Qualifier
Magnitude
FieldQuantity
Magnetic
Parameter #15
Name
B North 100km
ParameterKey
FBNORTH100KM
Description

The magnetic field magnitude at the North 100 km point based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
nT
ValidMin
0.0
ValidMax
100000.0
FillValue
-1.0E31
Field
Qualifier
Magnitude
FieldQuantity
Magnetic
Parameter #16
Name
B South 100km
ParameterKey
FBSOUTH100KM
Description

The magnetic field magnitude at the South 100 km point based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
nT
ValidMin
0.0
ValidMax
100000.0
FillValue
-1.0E31
Field
Qualifier
Magnitude
FieldQuantity
Magnetic
Parameter #17
Name
Mirror GSM XYZ
ParameterKey
FMIRRORGSM
Description

The spacecraft mirror point location in GSM coordinates (cartesian XYZ components) based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
km
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Element
Name
FMIRRORGSM X
Qualifier
Component.I
Index
1
Element
Name
FMIRRORGSM Y
Qualifier
Component.J
Index
2
Element
Name
FMIRRORGSM Z
Qualifier
Component.K
Index
3
ValidMin
-63800.0
ValidMax
63800.0
FillValue
-1.0E31
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #18
Name
Equatorial GSM XYZ
ParameterKey
FEQUATORIALGSM
Description

The Equatorial Point location in GSM coordinates (cartesian XYZ components) based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
km
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Element
Name
FEQUATORIALGSM X
Qualifier
Component.I
Index
1
Element
Name
FEQUATORIALGSM Y
Qualifier
Component.J
Index
2
Element
Name
FEQUATORIALGSM Z
Qualifier
Component.K
Index
3
ValidMin
-200000.0
ValidMax
250000.0
FillValue
-1.0E31
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #19
Name
North 100km GSM XYZ
ParameterKey
FNORTH100KMGSM
Description

The location of the North 100 km point in GSM coordinates (cartesian XYZ components) based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
km
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Element
Name
FNORTH100KMGSM X
Qualifier
Component.I
Index
1
Element
Name
FNORTH100KMGSM Y
Qualifier
Component.J
Index
2
Element
Name
FNORTH100KMGSM Z
Qualifier
Component.K
Index
3
ValidMin
-7000.0
ValidMax
7000.0
FillValue
-1.0E31
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #20
Name
South 100km GSM XYZ
ParameterKey
FSOUTH100KMGSM
Description

The location of the South 100 km point in GSM coordinates (cartesian XYZ components) based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
km
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Element
Name
FSOUTH100KMGSM X
Qualifier
Component.I
Index
1
Element
Name
FSOUTH100KMGSM Y
Qualifier
Component.J
Index
2
Element
Name
FSOUTH100KMGSM Z
Qualifier
Component.K
Index
3
ValidMin
-7000.0
ValidMax
7000.0
FillValue
-1.0E31
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #21
Name
L Shell
ParameterKey
FLSHELL
Description

The dimensionless McIlwain L-Shell Parameter based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

ValidMin
0.0
ValidMax
50.0
FillValue
-1.0E31
Support
SupportQuantity
Other
Parameter #22
Name
Inv Lat
ParameterKey
FINVLAT
Description

Spacecraft invariant magnetic latitude based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
deg
ValidMin
0.0
ValidMax
90.0
FillValue
-1.0E31
Support
Qualifier
DirectionAngle.ElevationAngle
SupportQuantity
Positional
Parameter #23
Name
Dipole Radius
ParameterKey
FDIPOLERADIUS
Description

Dipole magnetic radial distance based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
km
ValidMin
6380.0
ValidMax
127600.0
FillValue
-1.0E31
Support
SupportQuantity
Other
Parameter #24
Name
Dipole Lat
ParameterKey
FDIPOLELAT
Description

Dipole magnetic latitude based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
deg
ValidMin
-90.0
ValidMax
90.0
FillValue
-1.0E31
Support
Qualifier
DirectionAngle.ElevationAngle
SupportQuantity
Other
Parameter #25
Name
S/C ECD Lat
ParameterKey
FSCLATECD
Description

Spacecraft latitude in the eccentric dipole frame based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
deg
ValidMin
-90.0
ValidMax
90.0
FillValue
-1.0E31
Support
Qualifier
DirectionAngle.ElevationAngle
SupportQuantity
Positional
Parameter #26
Name
LT GEO
ParameterKey
FLTGEO
Description

Magnetic local time in the geographic coordinates frame.

Units
hr
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GEO
ValidMin
0.0
ValidMax
24.0
FillValue
-1.0E31
Support
Qualifier
DirectionAngle.AzimuthAngle
SupportQuantity
Positional
Parameter #27
Name
LT ECD
ParameterKey
FLTECD
Description

Magnetic local time in the eccentric dipole (ECD) frame based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
hr
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
ECD
ValidMin
0.0
ValidMax
24.0
FillValue
-1.0E31
Support
Qualifier
DirectionAngle.AzimuthAngle
SupportQuantity
Positional
Parameter #28
Name
LT Equatorial
ParameterKey
FLTEQU
Description

Equatorial mapped magnetic local time in the eccentric dipole (ECD) frame based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
hr
ValidMin
0.0
ValidMax
24.0
FillValue
-1.0E31
Support
Qualifier
DirectionAngle.AzimuthAngle
SupportQuantity
Other
Parameter #29
Name
Solar Zenith
ParameterKey
FSOLARZENITHCOS
Description

Solar zenith angle cosine.

Units
deg
ValidMin
-1.0
ValidMax
1.0
FillValue
-1.0E31
Support
Qualifier
DirectionAngle.ElevationAngle
SupportQuantity
Other
Parameter #30
Name
Loss Cone
ParameterKey
FLOSSCONE
Description

Particle loss cone angle based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
deg
ValidMin
0.0
ValidMax
90.0
FillValue
-1.0E31
Support
SupportQuantity
Other
Parameter #31
Name
Dipole Tilt
ParameterKey
FDIPOLETILT
Description

Magnetic dipole tilt angle based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
deg
ValidMin
0.0
ValidMax
90.0
FillValue
-1.0E31
Support
SupportQuantity
Other
Parameter #32
Name
Dipole Offset XYZ
ParameterKey
FDIPOLEOFFSET
Description

Magnetic dipole displacement (XYZ components) based on the International Geomagnetic Reference Field (IGRF) 2005.0 adjusted for the relevant date by means of the IGRF secular variation coefficients.

Units
km
Structure
Size
3
Element
Name
FDIPOLEOFFSET X
Qualifier
Component.I
Index
1
Element
Name
FDIPOLEOFFSET Y
Qualifier
Component.J
Index
2
Element
Name
FDIPOLEOFFSET Z
Qualifier
Component.K
Index
3
ValidMin
-1000.0
ValidMax
1000.0
FillValue
-1.0E31
Support
Qualifier
Vector
SupportQuantity
Other
Parameter #33
Name
DataFile ID
ParameterKey
NDATAFILEID
Description

TWINS DataFile ID

Caveats
DataFile ID as used in TWINS database storage
ValidMin
0.0
ValidMax
3.23786E-319
FillValue
-1.0E31
Support
SupportQuantity
Other