FAST Fluxgate Magnetometer High-Resolution 7.8125 ms Data

https://doi.org/10.48322/86pq-hb06

2023-07-30 12:34:56.789

Calibrated Fluxgate Data acquired by the Fast Auroral SnapshoT Small Explorer, FAST, Magnetometer Instrument. Data have been calibrated, despun, and detrended against the International Geomagnetic Reference Field, IGRF, using IGRF Coefficients for the Date of Acquisition. Data are provided in several Coordinate Systems. Non detrended Data in Spacecraft and Geocentric Equatorial Inertial Coordinates are provided. Ephemeris Data are also provided.

C.W. Carlson, R.J. Strangeway Include Acknowledgement in any publication.

spase://VSPO/NumericalData/FAST/DCF/MAG/HR_DCB/PT0.125S

spase://VSPO/NumericalData/FAST/MAG/Fluxgate/PT7.8125MS

Online

Open

CDF

None

C.W. Carlson, R.J. Strangeway Include Acknowledgement in any publication. Please acknowledge the Data Providers and CDAWeb when using these Data.

Online

Open

CSV

C.W. Carlson, R.J. Strangeway Include Acknowledgement in any publication. Please acknowledge the Data Providers and CDAWeb when using these Data.

PT0.0078125S

Epoch Time

Epoch

Epoch Time, Default Time for Processed Data

Time is specified as a Terrestrial Time 2000, TT2000, Variable. Conversion to TT2000 assumes that the Coordinated Universal Time, UTC, as given by the FAST Data Decommutator is correct. This Parameter exhibits an increasing Monotonic Progression.

PT0.0078125S

ns

1.0e-9>s

1990-01-01T00:00:00.000000000

2030-01-01T00:00:00.999999999

9999-12-31T23:59:59.999999999

Range Epoch

range_epoch

Range Epoch, CDF Start Time and Stop Time

Start Time and Stop Time for the current CDF File This Parameter exhibits an increasing Monotonic Progression.

PT135M

ns

1.0e-9>s

1990-01-01T00:00:00.000000000

2030-01-01T00:00:00.999999999

9999-12-31T23:59:59.999999999

Delta Magnetic Field Vector, Despun Spacecraft Coordinates, Cartesian

Time Series defined by using: EPOCH

DeltaB_DSC

Delta Magnetic Field Vector, Despun Spacecraft Coordinates, DSC, Cartesian

Delta Magnetic Field Vector in Despun Spacecraft Coordinates. The Model Magnetic Field Values are calculated by using the International Geomagnetic Reference Field, IGRF, Model Version 11. Despun Spacecraft Coordinates, DSC, are defined as: Z-axis along the Spin Axis, Y-axis in the Spin Plane perpendicular to the Sun Direction, X-axis completing the Triad X-Y-Z. Detrended DeltaB Data have bad Data deleted, DEL_MAG_FLAG equal to 1.

PT0.0078125S

nT

1.0e-9>T

-100000.0

100000.0

-1.0e+31

Delta Magnetic Field Vector, Geocentric Equatorial Inertial Cartesian Coordinates

Time Series defined by using: EPOCH

DeltaB_GEI

Delta Magnetic Field Vector, Geocentric Equatorial Inertial, GEI, Cartesian Coordinates

DeltaB in Geocentric Equatorial Inertial Coordinates. The Model Magnetic Field Values are calculated by using the International Geomagnetic Reference Field, IGRF, Model Version 11. Detrended DeltaB Data have bad Data deleted, DEL_MAG_FLAG equal to 1.

PT0.0078125S

nT

1.0e-9>T

-100000.0

100000.0

-1.0e+31

Delta Magnetic Field Vector, Solar Magnetic Cartesian Coordinates

Time Series defined by using: EPOCH

DeltaB_SM

Delta Magnetic Field Vector, Solar Magnetic, SM, Cartesian Coordinates

DeltaB in Solar Magnetic Coordinates. The Model Magnetic Field Values and the Dipole Axis Direction are calculated by using the International Geomagnetic Reference Field, IGRF, Model Version 11. Detrended DeltaB Data have bad Data deleted, DEL_MAG_FLAG equal to 1.

PT0.0078125S

nT

1.0e-9>T

-100000.0

100000.0

-1.0e+31

Delta Magnetic Field Vector, Field-aligned Coordinates, Cartesian

Time Series defined by using: EPOCH

DeltaB_FAC

Delta Magnetic Field Vector, Field-aligned Coordinates, FAC, o-e-b Cartesian Triad

DeltaB in Field-aligned Coordinates. The Model Magnetic Field is IGRF Version 11. Field-aligned Coordinates, FAC, defined as: 'b' along the Model Magnetic Field, 'e' as East, in the Direction of B-cross-R, and 'o' outwards, completing the Triad o-e-b. Near the Poles 'outwards' points towards the respective north or south Pole. Detrended DeltaB Data have bad Data deleted, DEL_MAG_FLAG equal to 1.

PT0.0078125S

nT

1.0e-9>T

-100000.0

100000.0

-1.0e+31

Delta Magnetic Field Vector, Field-aligned Spacecraft Coordinates, Cartesian

Time Series defined by using: EPOCH

DeltaB_FAC_V

Delta Magnetic Field Vector, Field-aligned Spacecraft Coordinates, FAC, v-p-b Cartesian Triad

DeltaB in Field-aligned Spacecraft Coordinates. The Model Magnetic Field is IGRF Version 11. Field-aligned Spacecraft Coordinates use the Spacecraft Velocity Vector, hence DeltaB_FAC_V, in specifying the Coordinate system, which is defined as: 'b' along the Model Magnetic Field, 'p' perpendicular, in the Direction of B-cross-vel_Spacecraft, that is, across Track, and 'v' nominally along the Spacecraft Velocity Vector, along Track, completing the Triad v-p-b. Detrended DeltaB Data have bad Data deleted, DEL_MAG_FLAG equal to 1.

PT0.0078125S

nT

1.0e-9>T

-100000.0

100000.0

-1.0e+31

Delta Magnetic Field Vector, Field-aligned Spin Plane Coordinates, Cartesian

Time Series defined by using: EPOCH

DeltaB_FAC_SP

Delta Magnetic Field Vector, Field-aligned Spin Plane Coordinates, FAC, s-p-b Cartesian Triad

DeltaB in Field-aligned/Spin Plane Coordinates. The Model Magnetic Field is IGRF Version 11. Field-aligned/Spin Plane Coordinates use the Spin Plane, hence DeltaB_FAC_SP, in specifying the Coordinate system, which is defined as: 'b' along the Model Magnetic Field, 's' in the Spin Axis cross Model Magnetic Field Direction, that is, in the Spin Plane and perpendicular to the Model Field, and 'p' perpendicular (B ⨯ (Spin Axis ⨯ B)), nominally along the Spin Axis, completing the Triad s-p-b. The Spin Plane Coordinate 's' is in the same Direction as the despun Electric Field 'E along V' Component. Note that 'E along V' is nominally along the Spacecraft Velocity only in the northern Hemisphere, and is nominally antiparallel to the Spacecraft Velocity Vector in the southern Hemisphere. The 'E along V' Electric Field crossed with the p-component of 'deltaB_FAC_SP' contributes to the Field-aligned Poynting Flux. In this s-p-b Coordinate system, positive Field-aligned Poynting Flux is into the northern Ionosphere, but away from the southern Ionosphere. The other Contribution to the Field-aligned Poynting Flux would be from the p-component of the Electric Field crossed with the s-component of the DeltaB Magnetic Field, but the p-component of the Electric Field is mainly given by the Spin Axis Electric Field Measurement. Because one of the Axial Booms did not deploy on FAST the Spin Axis Electric Field is generally not used. Detrended DeltaB Data have bad Data deleted, DEL_MAG_FLAG equal to 1.

PT0.0078125S

nT

1.0e-9>T

-100000.0

100000.0

-1.0e+31

Full Magnetic Field Vector, Geocentric Equatorial Inertial Coordinates

Time Series defined by using: EPOCH

B_GEI

Full Magnetic Field Vector, Geocentric Equatorial Inertial, GEI, Coordinates

Full non-detrended Magnetometer Data in Geocentric Equatorial Inertial Coordinates, with bad Data deleted, indicated by DEL_MAG_FLAG equal to 1

PT0.0078125S

nT

1.0e-9>T

-1.0e+08

1.0e+08

-1.0e+31

Magnetic Field Data Deletion Flag

Time Series defined by using: EPOCH

DEL_MAG_FLAG

Magnetic Field Data Deletion Flag

Flags Data that have been deleted in the Magnetic Field Vector Data, B_GEI, and detrended Delta Magnetic Field, DeltaB, Data, or should be deleted from the non-detrended B_DSC and B_SSC Data

PT0.0078125S

0

1

-2147483648

Torquer Coil Magnetic Field Vector Data

Time Series defined by using: EPOCH

Torquer

Estimated Torquer Coil Magnetic Field Vector Data

Estimated Torquer Coil Magnetic Field, in spinning Spacecraft Coordinates. Units are pseudo nT since the Field is estimated with intermediate Data.

PT0.0078125S

nT

1.0e-9>T

-1.0e+08

1.0e+08

-1.0e+31

Time varying Tweaker Matrix

Time Series defined by using: EPOCH

Tweaker

Time varying Tweaker Orthogonalization Matrix

Time varying Tweaker Matrix that gives final Orthogonalization and removes Spin Plane Offsets. Tweaker takes into account on Orbit Variations caused by Eclipse Entry, etc. TW_ZX is used to remove from the Z-sensor any Spin Tone Signals in Phase with the X-sensor. TW_ZY is used to remove from the Z-sensor any Spin Tone Signals in Phase with the Y-sensor. TW_YY is used to make the Y-sensor have the same Gain as the X-sensor. TW_YX is used to remove from the Y-sensor any Spin Tone Signals in Phase with the X-sensor. O_X is used to remove any DC Offsets from the X-sensor. O_Y is used to remove any DC Offsets from the Y-sensor.

PT0.0078125S

-1000.0

1000.0

-1.0e+31

Magnetometer Data Quality Flag

Time Series defined by using: EPOCH

MAG_QUAL_FLAG

Magnetometer Data Quality Flag

The Magnetometer Data Quality Flags are additive. Flag Values 1 to 16 are Torquer and other Data Processing Flags. Flag Values 32 to 2048 are Flags related to Spin Phase Issues. Any Data with a Flag Value 2048 or greater should be used with care. Flag Values: 0=Good, 1=Torquers On, 2=Torquer Ramp, 4=Nutation, to be determined, 8=Reserved, 16=Reserved, 32=Spin Phase Object set to Zero, 64=In Eclipse, using Nadir Table, 128=Reserved, 256=Reserved, 512=Spin Phase Data not smoothed, 1024=Spin Phase Data patched with Nadir or Mission Unique Electronics, MUE, Phase Data, 2048=Missing Spin Phase Data.

PT0.0078125S

0

4096

-2147483648

Full Magnetic Field Vector, Despun Spacecraft Coordinates

Time Series defined by using: EPOCH

B_DSC

Full Magnetic Field Vector, Despun Spacecraft Coordinates, DSC

Full non-detrended Magnetometer Data in Despun Spacecraft Coordinates (DSC), with bad Data included, indicated by DEL_MAG_FLAG equal to 1. Despun Spacecraft Coordinates have the Z-axis along the nominal Spin Axis, and the Sun in the X-Z Plane.

PT0.0078125S

nT

1.0e-9>T

-1.0e+08

1.0e+08

-1.0e+31

Full Magnetic Field Vector, spinning Spacecraft Coordinates

Time Series defined by using: EPOCH

B_SSC

Full Magnetic Field Vector, spinning Spacecraft Coordinates, SSC

Full non-detrended Magnetometer Data in spinning Spacecraft Coordinates, SSC, with bad Data included, indicated by DEL_MAG_FLAG equal to 1

PT0.0078125S

nT

1.0e-9>T

-1.0e+08

1.0e+08

-1.0e+31

Removed Magnetic Field Vector, Spin Tone Harmonic, Despun Spacecraft Coordinates

Time Series defined by using: EPOCH

Bharmonic_DSC

Removed Magnetic Field Vector, Spin Tone Harmonic, Despun Spacecraft Coordinates, DSC

Magnetic Field Spin Tone Harmonic in Despun Spacecraft Coordinates (DSC). Bad Data removed, DEL_MAG_FLAG equal to 1.

PT0.0078125S

nT

1.0e-9>T

-1.0e+08

1.0e+08

-1.0e+31

Default Time, Spin Data

Spin_Epoch

Default Epoch Time, Spin Phase and Spin Frequency Data

Time is specified as a TT2000 Variable. Conversion to TT2000 assumes the UTC as given by the FAST Data Decommutator is correct. This Parameter exhibits an increasing Monotonic Progression.

PT15S

ns

1.0e-9>s

1990-01-01T00:00:00.000000000

2030-01-01T00:00:00.999999999

9999-12-31T23:59:59.999999999

Spin Frequency

Time Series defined by using: SPIN_EPOCH

Spin_Freq

Spacecraft Spin Frequency

Spacecraft Spin Frequency at the Time specified by Spin_Epoch

PT15S

°/s

-1000.0

1000.0

-1.0e+31

Spin Phase Angle

Time Series defined by using: SPIN_EPOCH

Spin_Phase

Spacecraft Spin Phase Angle, Magnetometer X-axis

Phase Angle of the Magnetometer X-axis with respect to the Sun at the Time specified by Spin_Epoch

PT15S

°

0.0174532925>rad

-1080.0

1080.0

-1.0e+31

Default Time, Ephemeris Data

Ephemeris_Epoch

Default Epoch Time, Ephemeris Data

Time is specified as a TT2000 Variable. Conversion to TT2000 assumes the UTC as given by the FAST Data Decommutator is correct. Ephemeris Data are usually provided with a 1 s Cadence. This Parameter exhibits an increasing Monotonic Progression.

PT1S

ns

1.0e-9>s

1990-01-01T00:00:00.000000000

2030-01-01T00:00:00.999999999

9999-12-31T23:59:59.999999999

FAST Orbit Number

Time Series defined by using: EPHEMERIS_EPOCH

Orbit

FAST Spacecraft Orbit Number

Orbit Number as specified by the FAST Ephemeris Software, together with the other Ephemeris Information

PT1S

0.0

99999.0

-1.0e+31

Spacecraft Position, Geocentric Equatorial Inertial Coordinates

Time Series defined by using: EPHEMERIS_EPOCH

pos_gei

Spacecraft Position, Geocentric Equatorial Inertial, GEI, Coordinates

FAST Spacecraft Position in Geocentric Equatorial Inertial Coordinates

PT1S

km

1.0e3>m

-1.0e+08

1.0e+08

-1.0e+31

Spacecraft Velocity, Geocentric Equatorial Inertial Coordinates

Time Series defined by using: EPHEMERIS_EPOCH

vel_gei

Spacecraft Velocity, Geocentric Equatorial Inertial, GEI, Coordinates

FAST Spacecraft Velocity in Geocentric Equatorial Inertial Coordinates

PT1S

km/s

1.0e3>m/s

-1.0e+08

1.0e+08

-1.0e+31

Model Magnetic Field Vector, Geocentric Equatorial Inertial Coordinates

Time Series defined by using: EPHEMERIS_EPOCH

B_model_gei

Model Magnetic Field Vector, Geocentric Equatorial Inertial, GEI, Coordinates

Model Magnetic Field, IGRF Version 11 at the Date of Acquisition, in Geocentric Equatorial Inertial Coordinates

PT1S

nT

1.0e-9>T

-1.0e+08

1.0e+08

-1.0e+31

Spacecraft Position, Altitude

Time Series defined by using: EPHEMERIS_EPOCH

alt

Spacecraft Position, Altitude, relative to 6378.14 km

FAST Altitude with respect to Earth Equatorial Radius, 6378.14 km, not mean Radius or Geodetic Altitude

PT1S

km

1.0e3>m

0.0

99999.0

-1.0e+31

Spacecraft Position, Geographic Latitude

Time Series defined by using: EPHEMERIS_EPOCH

lat

Spacecraft Position, Geographic, GEO, Latitude

FAST Geographic Latitude with respect to the Sphere with Earth Equatorial Radius, 6378.14 km, not Geodetic

PT1S

°

0.0174532925>rad

-90.0

90.0

-1.0e+31

Spacecraft Position, Geographic Latitude, as Audio

Time Series defined by using: EPHEMERIS_EPOCH

lat_audio

Spacecraft Position, Geographic, GEO, Latitude, as Audio, do not use

This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: lat.

PT1S

°

0.0174532925>rad

-90.0

90.0

-1.0e+31

Spacecraft Position, Geographic Longitude

Time Series defined by using: EPHEMERIS_EPOCH

lng

Spacecraft Position, Geographic, GEO, Longitude

FAST Geographic Longitude with respect to the Sphere with Earth Equatorial Radius, 6378.14 km, not Geodetic

PT1S

°

0.0174532925>rad

-180.0

180.0

-1.0e+31

Spacecraft Position, Geographic Longitude, as Audio

Time Series defined by using: EPHEMERIS_EPOCH

lng_audio

Spacecraft Position, Geographic, GEO, Longitude, as Audio, do not use

This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: lng.

PT1S

°

0.0174532925>rad

-180.0

180.0

-1.0e+31

Spacecraft Position, Invariant Latitude

Time Series defined by using: EPHEMERIS_EPOCH

ilat

Spacecraft Position, Invariant Latitude, tilted Dipole Coordinates

FAST Invariant Latitude, ILAT, calculated with respect to the Offset, Tilted Dipole. Dipole Geographic Position: [-402.199, 287.504, 195.908] km, Dipole Orientation: Latitude 79.3637°, Longitude 288.454°. Invariant Latitude defined using 6371.2 km Radius with respect to Dipole Origin.

PT1S

°

0.0174532925>rad

-90.0

90.0

-1.0e+31

Spacecraft Position, Invariant Longitude

Time Series defined by using: EPHEMERIS_EPOCH

ilng

Spacecraft Position, Invariant Longitude, tilted Dipole Coordinates

FAST Invariant Longitude, ILNG, calculated with respect to the Offset, Tilted Dipole. Dipole Geographic Position: [-402.199, 287.504, 195.908] km, Dipole Orientation: Latitude 79.3637°, Longitude 288.454°.

PT1S

°

0.0174532925>rad

-180.0

180.0

-1.0e+31

Spacecraft Position, Magnetic Local Time

Time Series defined by using: EPHEMERIS_EPOCH

mlt

Spacecraft Position, Magnetic Local Time, MLT

FAST Magnetic Local Time, MLT, calculated from the Invariant Longitude, ILNG, which in turn is derived by using an Offset, Tilted Dipole. Dipole Geographic Position: [-402.199, 287.504, 195.908] km, Dipole Orientation: Latitude 79.3637°, Longitude 288.454°.

PT1S

h

3600>s

0.0

24.0

-1.0e+31

Spacecraft Footpoint, Geodetic Latitude

Time Series defined by using: EPHEMERIS_EPOCH

flat

Spacecraft Footpoint, Geodetic Latitude, at 100 km Altitude

Latitude of the FAST Spacecraft Magnetic Footpoint at 100 km Altitude, Geodetic Coordinates. IGRF Version 7 used for Magnetic Field Model (IGRF Version 7 is the default in the Field Line tracing Code). Latitude is in Geodetic Coordinates.

PT1S

°

0.0174532925>rad

-90.0

90.0

-1.0e+31

Spacecraft Footpoint, Geodetic Longitude

Time Series defined by using: EPHEMERIS_EPOCH

flng

Spacecraft Footpoint, Geodetic Longitude, at 100 km Altitude

Longitude of the FAST Spacecraft Magnetic Footpoint at 100 km Altitude, Geodetic Coordinates. IGRF Version 7 used for Magnetic Field Model (IGRF Version 7 is the default in the Field Line tracing Code). Longitude is in Geodetic Coordinates.

PT1S

°

0.0174532925>rad

-180.0

180.0

-1.0e+31

Spacecraft Footpoint Magnetic Field, Geocentric Equatorial Inertial Coordinates

Time Series defined by using: EPHEMERIS_EPOCH

B_foot_gei

Spacecraft Footpoint Magnetic Field, Geocentric Equatorial Inertial, GEI, Coordinates

IGRF Version 7 Model Magnetic Field at the Position specified by FLAT, FLNG, and 100 km Altitude Geodetic (IGRF Version 7 is the default in the Field Line tracing Code)

PT1S

nT

1.0e-9>T

-1.0e+08

1.0e+08

-1.0e+31

Sun Direction, Geocentric Equatorial Inertial Coordinates

Time Series defined by using: EPHEMERIS_EPOCH

sun_dir_gei

Sun Direction Unit Vector, Geocentric Equatorial Inertial, GEI, Coordinates

The Unit Vector pointing to the Sun Direction is used to construct the despun Spacecraft to Geocentric Equatorial Inertial Coordinate Transformation. This Unit Vector is also used to generate the GEI to Solar Magnetic Coordinate Transformation.

PT1S

-1.0

1.0

-1.0e+31

Dipole Orientation, Geocentric Equatorial Inertial Coordinates

Time Series defined by using: EPHEMERIS_EPOCH

dip_orient_gei

Dipole Orientation Unit Vector, Geocentric Equatorial Inertial, GEI, Coordinates

Unit Vector giving Dipole Orientation in Geocentric Equatorial Inertial Coordinates. Dipole specified by the g10, g11, and h11 Values of the IGRF 11 Model, using the center Time of the Orbit as the Reference Epoch. Used to generate GEI to Solar Magnetic Coodinate Transformation.

PT1S

-1.0

1.0

-1.0e+31

Reference Epoch Time for constant Orbit Variables

Orbit_Fixed_Epoch

Reference Epoch Time for Variables that are constant over the Orbit

Time is specified as a TT2000 Variable. Conversion to TT2000 assumes the UTC as given by the FAST Data Decommutator is correct. Orbit_Fixed_Epoch specified as the median Time of the Ephemeris_Epoch Time Span. This Parameter exhibits an increasing Monotonic Progression.

PT135M

ns

1.0e-9>s

1990-01-01T00:00:00.000000000

2030-01-01T00:00:00.999999999

9999-12-31T23:59:59.999999999

Orbit Number

Time Series defined by using: ORBIT_FIXED_EPOCH

Orbit_Value

Spacecraft Orbit Number

Fixed Value of the Orbit Number, specified at the Orbit_Fixed_Epoch Time

PT135M

0.0

99999.0

-1.0e+31

Magnetometer Coupling Matrix Components

Time Series defined by using: ORBIT_FIXED_EPOCH

Coupling_Matrix

Magnetometer Coupling Matrix Components

Magnetometer Coupling Matrix Components, fixed Values for the Orbit. Coupling Matrix Components can change from Orbit to Orbit.

PT135M

-2.0

2.0

-1.0e+31

Magnetometer Offsets

Time Series defined by using: ORBIT_FIXED_EPOCH

Offsets

Magnetometer Sensor Component Offsets

Magnetometer Sensor Component Offsets, fixed Values for the Orbit. Offsets can change from Orbit to Orbit.

PT135M

nT

1.0e-9>T

-1000.0

1000.0

-1.0e+31

Spin Axis Orientation

Time Series defined by using: ORBIT_FIXED_EPOCH

Spin_Axis

Spin Axis Orientation, Right Ascension and Declination

Spin Axis Right Ascension, RA, and Declination, DEC, obtained by comparing IGRF Model Field with Data. The Parameters RA_FDF and DEC_FDF are the starting Values for the initial Comparison where FDF standing for Flight Dynamics Facility.

PT135M

°

0.0174532925>rad

-720.0

720.0

-1.0e+31

Spin Phase Delta

Time Series defined by using: ORBIT_FIXED_EPOCH

Spin_Phase_Delta

Spin Phase Delta in the Spin Plane

Angle by which the measured Field leads the Model Field in the Spin Plane, before correction. The Correction is used to rotate the measured Field back by this Angle.

PT135M

°

0.0174532925>rad

-720.0

720.0

-1.0e+31