Cluster Auxiliary Data

2021-03-29 17:14:50Z

Cluster Auxiliary Parameters are produced by the Cluster Hungarian Data Center in Budapest. These data are the primary orbit product supplied to users by the Cluster Active Archive. The data contain Position, Velocity and Attitude of four Cluster spacecraft.

        For additional details on the methodology behind these data see:

        Robert P., et al., "Tetrahedron Geometric Factors", p. 328, Analysis Methods of Multi-Spacecraft Data, ed. G. Paschmann and P. Daly, 1998, ESA and the International Space Institute, Bern.

spase://VMO/NumericalData/Cluster2/Ephemeris/PT1M

spase://VMO/NumericalData/Cluster2/Ephemeris/SummaryParameter/PT1M

spase://VMO/NumericalData/Cluster/Ephemeris/SummaryParameter/PT1M

spase://VSPO/NumericalData/Cluster/Ephemeris/SummaryParameter/PT60S

CDF

PT1M

Epoch

Epoch__CL_SP_AUX

Interval centered time tag rounded to the nearest millisecond

ms

1.0e-3>s

6.2924602e13

6.34295223e13

Spacecraft Status

sc_status__CL_SP_AUX

Spacecraft Status, 0 = Bad Value, 1 = Use with caution, 2 = OK, 255 = Not Supplied

PT1M

0

255

Spacecraft Orbit Number

sc_orbit_num__CL_SP_AUX

Spacecraft orbit number including phase. Values are of the form orbit.phase

PT1M

0

1000

Reference Spacecraft Position GSE

sc_r_xyz_gse__CL_SP_AUX

Position, in GSE, of the Reference Spacecraft. Cluster 3 is used as the reference spacecraft

PT1M

km

1.0e3>m

Reference Spacecraft Velocity GSE

sc_v_xyz_gse__CL_SP_AUX

Velocity, in GSE, of the Reference Spacecraft. Cluster 3 is used as the reference spacecraft

PT1M

km/s

1.0e3>m s^-1

Spacecraft 1 Position Relative to Reference Spacecraft

sc_dr1_xyz_gse__CL_SP_AUX

Offset, in GSE, of Spacecraft 1 from the reference spacecraft. Cluster 3 is used as the reference spacecraft

PT1M

km

1.0e3>m

Spacecraft 2 Position Relative to Reference Spacecraft

sc_dr2_xyz_gse__CL_SP_AUX

Offset, in GSE, of Spacecraft 2 from the reference spacecraft. Cluster 3 is used as the reference spacecraft

PT1M

km

1.0e3>m

Spacecraft 3 Position Relative to Reference Spacecraft

sc_dr3_xyz_gse__CL_SP_AUX

Offset, in GSE, of Spacecraft 3 from the reference spacecraft. Cluster 3 is used as the reference spacecraft

PT1M

km

1.0e3>m

Spacecraft 4 Position Relative to Reference Spacecraft

sc_dr4_xyz_gse__CL_SP_AUX

Offset, in GSE, of Spacecraft 4 from the reference spacecraft. Cluster 3 is used as the reference spacecraft

PT1M

km

1.0e3>m

Spacecraft 1 Axis Latitude GSE

sc_at1_lat__CL_SP_AUX

GSE latitude of spacecraft 1 axis, angle from Ecliptic Plane

PT1M

degrees

1.0>degrees

-90

90

Spacecraft 1 Axis Longitude GSE

sc_at1_long__CL_SP_AUX

GSE longitude of spacecraft 1 axis, angle from x in x-y GSE plane

PT1M

degrees

1.0>degrees

0

360

Spacecraft 2 Axis Latitude GSE

sc_at2_lat__CL_SP_AUX

GSE latitude of spacecraft 2 axis, angle from Ecliptic Plane

PT1M

degrees

1.0>degrees

-90

90

Spacecraft 2 Axis Longitude GSE

sc_at2_long__CL_SP_AUX

GSE longitude of spacecraft 2 axis, angle from x in x-y GSE plane

PT1M

degrees

1.0>degrees

0

360

Spacecraft 3 Axis Latitude GSE

sc_at3_lat__CL_SP_AUX

GSE latitude of spacecraft 3 axis, angle from Ecliptic Plane

PT1M

degrees

1.0>degrees

-90

90

Spacecraft 3 Axis Longitude GSE

sc_at3_long__CL_SP_AUX

GSE longitude of spacecraft 3 axis, angle from x in x-y GSE plane

PT1M

degrees

1.0>degrees

0

360

Spacecraft 4 Axis Latitude GSE

sc_at4_lat__CL_SP_AUX

GSE latitude of spacecraft 4 axis, angle from Ecliptic Plane

PT1M

degrees

1.0>degrees

-90

90

Spacecraft 4 Axis Longitude GSE

sc_at4_long__CL_SP_AUX

GSE longitude of spacecraft 4 axis, angle from x in x-y GSE plane

PT1M

degrees

1.0>degrees

0

360

Tetrahedron Quality G

sc_config_QG__CL_SP_AUX

Spacecraft Quality Shape, (vol/ideal) + (surf/ideal) + 1

PT1M

1

3

Tetrahedron Quality R

sc_config_QR__CL_SP_AUX

Spacecraft Quality Shape, norm*(vol/sphere vol)^(1/3)

PT1M

0

1

Minimum Distance Between Spacecraft

sc_dr_min__CL_SP_AUX

Minimum distance between spacecraft

PT1M

km

1e3>m

0

1e7

Maximum Distance Between Spacecraft

sc_dr_max__CL_SP_AUX

Maximum distance between spacecraft

PT1M

km

1e3>m

0

1e7

Rotation angle GSE to GSM

gse_gsm__CL_SP_AUX

Rotation angle GSE to GSM, positive from +z towards +y

PT1M

degrees

1>degrees

-90

90

Dipole tilt

dipole_tilt__CL_SP_AUX

Dipole tilt in GSM z-x plane, positive from +z towards +x

PT1M

degrees

1>degrees

-90

90

Tetrahedron size L

sc_geom_size__CL_SP_AUX

Tetrahedron size

PT1M

km

1e3>m

0

1e7

Tetrahedron Elongation

sc_geom_elong__CL_SP_AUX

Tetrahedron elongation

PT1M

0

1

Tetrahedron Planarity

sc_geom_planarity__CL_SP_AUX

Tetrahedron planarity

PT1M

0

1

Direction of elongation

sc_geom_E_dir_gse__CL_SP_AUX

direction of elongation, direction cosines

PT1M

-1

1

Normal of Planarity

sc_geom_P_nor_gse__CL_SP_AUX

normal of planarity, direction cosines

PT1M

-1

1