HPDE.io

THEMIS-C Definitive Ephemeris and Spin Attitude Corrections (CDF)

ResourceID
spase://CNES/NumericalData/CDPP-Archive/THEMIS-C/DefinitiveEphemeris/THEMIS_AUX_THC_L1_EPHEM

Description

This dataset contains THEMIS-C position, velocity, attitude and sun pulse data.
The data are definitive with added science attitude determination using perigee data post-processing.

View XML | View JSON | Edit

Details

Version:2.4.0

NumericalData

ResourceID
spase://CNES/NumericalData/CDPP-Archive/THEMIS-C/DefinitiveEphemeris/THEMIS_AUX_THC_L1_EPHEM
ResourceHeader
ResourceName
THEMIS-C Definitive Ephemeris and Spin Attitude Corrections (CDF)
DOI
https://doi.org/10.24400/802406/9aa5-5gz5
ReleaseDate
2022-01-21 08:24:17Z
Description

This dataset contains THEMIS-C position, velocity, attitude and sun pulse data.
The data are definitive with added science attitude determination using perigee data post-processing.

Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://CNES/Person/CDPP-Archive/Vassilis.Angelopoulos
2.GeneralContactspase://CNES/Person/CDPP-Archive/CDPP.general.contact
AccessInformation
RepositoryID
Availability
Online
AccessURL
Format
CDF
ProcessingLevel
Uncalibrated
InstrumentIDs
MeasurementType
Ephemeris
TemporalDescription
TimeSpan
StartDate
2007-02-28 00:00:00Z
StopDate
2010-01-04 00:00:00Z
ObservedRegion
Heliosphere.NearEarth
ObservedRegion
Earth.Magnetosphere.Magnetotail
ObservedRegion
Earth.Magnetosphere.Main
ObservedRegion
Earth.Magnetosheath
Parameter #1
Name
THEMIS-C position vector in GEI coordinates
Description

THEMIS-C position vector (km) in GEI coordinates

Units
km
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GEI
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #2
Name
THEMIS-C velocity vector in GEI coordinates
Description

THEMIS-C velocity vector (km/s) in GEI coordinates

Units
km/s
UnitsConversion
1e3>m/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GEI
Support
Qualifier
Vector
SupportQuantity
Velocity
Parameter #3
Name
THEMIS-C Maneuver Flag
Description

THEMIS-C maneuver status code (XYYZZZ). Values indicate if/what maneuver is being performed. Spacecraft data will be unreliable during maneuvers.
* Unpowered flight (Coast):
- X=0, Y=00, Z=000
* Sequence Code X:
- 0= No Segmentation
- 1= Segmented Maneuver
* Type Code YY:
- 0= No Maneuver
- 1= Axial-thrust Maneuver
- 2= Side-thrust Maneuver
- 3= Beta-thrust Maneuver
- 4= Attitude Precession
- 5= Spin-Rate Change
* Sequence Number ZZZ:
- 001-999= Maneuver Sequence Number

Support
SupportQuantity
Other
Parameter #4
Name
THEMIS-C RoI
Description

Region of interest. Different bits of this parameter give a general indication of the region that the spacecraft is in. The first 18 bits are significant. An active bit indicates the spacecraft is in a given region. Multiple bits may be set simultaneously. The value of the bit is in parentheses in the following table.

      +---------------------------------------------------+
      | Bit 1(1)      | Earth Shadow                      |
      | Bit 2(2)      | Lunar Shadow                      |
      | Bit 3(4)      | Atmospheric absorbtion zone       |
      | Bit 4(8)      | South Atlantic Anomaly            |
      | Bit 5(16)     | Northern Auroral Zone             |
      | Bit 6(32)     | Southern Auroral Zone             |
      | Bit 7(64)     | Perigee Passage                   |
      | Bit 8(128)    | Inner & Outer Radiation Belts |
      | Bit 9(256)    | Deep Plasma Sphere                |
      | Bit 10(512)   | Foreshock Solar Wind              |
      | Bit 11(1024)  | Solar Wind Beam                   |
      | Bit 12(2048)  | High Magnetic Field               |
      | Bit 13(4096)  | Average Plasma Sheet              |
      | Bit 14(8192)  | Bowshock Crossing                 |
      | Bit 15(16384) | Magnetopause Crossing             |
      | Bit 16(32768) | Ground Based Observatories        |
      | Bit 17(65536) | 2-Day Conjunctions                |
      | Bit 18(131072)| 4-Day Conjunctions                |
      +---------------------------------------------------+
Support
SupportQuantity
Other
Parameter #5
Name
THEMIS-C spin axis right ascension
Description

THEMIS-C spin axis right ascension in GEI coordinates.

Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GEI
Support
Qualifier
DirectionAngle.AzimuthAngle
SupportQuantity
Positional
Parameter #6
Name
THEMIS-C spin axis declination in GEI coordinates
Description

THEMIS-C spin axis declination in GEI coordinates

Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GEI
Support
Qualifier
DirectionAngle.ElevationAngle
SupportQuantity
Positional
Parameter #7
Name
THEMIS-C spin axis azimuth, Euler alpha, in Probe Geometric (SPG) coordinates
Description

THEMIS-C spin axis azimuth, Euler alpha, in Probe Geometric (SPG) coordinates

Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
SC
Support
Qualifier
DirectionAngle.AzimuthAngle
SupportQuantity
Positional
Parameter #8
Name
THEMIS-C spin axis colatitude, Euler beta, in Probe Geometric (SPG) coordinates
Description

THEMIS-C spin axis colatitude, Euler beta, in Probe Geometric (SPG) coordinates

Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
SC
Support
Qualifier
DirectionAngle.PolarAngle
SupportQuantity
Positional
Parameter #9
Name
THEMIS-C spin period, regularized and boxcar averaged
Description

THEMIS-C spin period, regularized and boxcar averaged

Units
s
Support
SupportQuantity
Temporal
Parameter #10
Name
THEMIS-C angle rotated since the sun sensor registered the sun pulse, regularized and boxcar averaged.
Description

THEMIS-C angle rotated since the sun sensor registered the sun pulse, regularized and boxcar averaged.

Units
deg
Support
Qualifier
PhaseAngle
SupportQuantity
Positional
Parameter #11
Name
THEMIS-C Initial Spin Period for segment
Description

THEMIS-C Initial Spin Period for segment

Units
s
Support
SupportQuantity
Temporal
Parameter #12
Name
THEMIS-C Drift term for spin rate
Description

Drift term for spin rate

Caveats
Applies to angular velocity (deg/sec), not spin period.
Units
deg/s^2
Support
SupportQuantity
Other
Parameter #13
Name
THEMIS-C Spin Correction
Description

THEMIS-C Spin phase correction from definitive position and field model calculated at 1 minute intervals

Units
deg
Support
Qualifier
DirectionAngle
SupportQuantity
Other
Parameter #14
Name
THEMIS-C Spin axis right ascension
Description

Spin axis right ascension correction from definitive position and field model

Units
deg
Support
SupportQuantity
Other
Parameter #15
Name
THEMIS-C Spin axis declination
Description

Spin axis declination correction from definitive position and field model

Units
deg
Support
SupportQuantity
Other
Parameter #16
Name
THEMIS-C Maximum absolute phase error
Description

Maximum absolute phase error between model and non-outlier sun crossing time

Caveats
Errors due to recognized BAU timing errors do not contribute to this quantity
Support
Qualifier
Uncertainty
SupportQuantity
Temporal
Parameter #17
Name
THEMIS-C Number of spins contained in this segment
Description

THEMIS-C Number of spins contained in this segment

Support
SupportQuantity
Other
Parameter #18
Name
THEMIS-C Pulse Gap
Description

Duration, in seconds, of longest gap between sun pulses in this segment. Long gaps (60 sec or more) will generally indicate shadow periods.

Units
s
Support
SupportQuantity
Temporal
Parameter #19
Name
THEMIS-C Position (GSE)
Description

Spacecraft position vector (km) in GSE coordinates

Units
km
UnitsConversion
1e3>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #20
Name
THEMIS-C Position (GSM)
Description

Spacecraft position vector (km) in GSM coordinates

Units
km
UnitsConversion
1e3>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #21
Name
THEMIS-C Velocity (GSE)
Description

Spacecraft velocity (km/s) in GSE coordinates

Units
km/s
UnitsConversion
1e3>m/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Support
Qualifier
Vector
SupportQuantity
Velocity
Parameter #22
Name
THEMIS-C Velocity (GSM)
Description

Spacecraft velocity (km/s) in GSM coordinates

Units
km/s
UnitsConversion
1e3>m/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Support
Qualifier
Vector
SupportQuantity
Velocity