Data Access
This dataset contains THEMIS-B position, velocity, attitude and sun pulse data.
The data are definitive with added science attitude determination using perigee data post-processing.
Version:2.4.0
This dataset contains THEMIS-B position, velocity, attitude and sun pulse data.
The data are definitive with added science attitude determination using perigee data post-processing.
| Role | Person | StartDate | StopDate | Note | |
|---|---|---|---|---|---|
| 1. | PrincipalInvestigator | spase://CNES/Person/CDPP-Archive/Vassilis.Angelopoulos | |||
| 2. | GeneralContact | spase://CNES/Person/CDPP-Archive/CDPP.general.contact |
Access via CNES Data Archive for CDPP
THEMIS-B position vector (km) in GEI coordinates
THEMIS-B velocity vector (km/s) in GEI coordinates
THEMIS-B 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
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 |
+---------------------------------------------------+THEMIS-B spin axis right ascension in GEI coordinates.
THEMIS-B spin axis declination in GEI coordinates
THEMIS-B spin axis azimuth, Euler alpha, in Probe Geometric (SPG) coordinates
THEMIS-B spin axis colatitude, Euler beta, in Probe Geometric (SPG) coordinates
THEMIS-B spin period, regularized and boxcar averaged
THEMIS-B angle rotated since the sun sensor registered the sun pulse, regularized and boxcar averaged.
THEMIS-B Initial Spin Period for segment
Drift term for spin rate
THEMIS-B Spin phase correction from definitive position and field model calculated at 1 minute intervals
Spin axis right ascension correction from definitive position and field model
Spin axis declination correction from definitive position and field model
Maximum absolute phase error between model and non-outlier sun crossing time
THEMIS-B Number of spins contained in this segment
Duration, in seconds, of longest gap between sun pulses in this segment. Long gaps (60 sec or more) will generally indicate shadow periods.
Spacecraft position vector (km) in GSE coordinates
Spacecraft position vector (km) in GSM coordinates
Spacecraft velocity (km/s) in GSE coordinates
Spacecraft velocity (km/s) in GSM coordinates