Table 2. Content of Swarm Level-1b Product MAGx_LR.
From: The Swarm Satellite Constellation Application and Research Facility (SCARF) and Swarm data products
Element | Contents | Units |
|---|---|---|
Timestamp | Time of observation | CDF_EPOCH |
SyncStatus | Time reference information | — |
Latitude | Latitude of observation in the International Terrestrial Reference Frame (ITRF) | degree |
Longitude | Longitude of observation in the ITRF | degree |
Radius | Radius of observation in ITRF | m |
F | Magnetic field intensity | nT |
dF_AOCS | Magnetic stray field correction intensity related to attitude control magneto-torquers | nT |
dF_other | Magnetic stray field correction intensity of all other sources | nT |
F_error | Error estimate on magnetic field intensity | nT |
B_VFM | Magnetic field vector in the instrument frame of the VFM magnetometer | nT |
B_NEC | Magnetic field vector in the NEC (North, East, Center) frame | nT |
dB_AOCS | Magnetic stray field correction vector related to attitude control magneto-torquers (in VFM frame) | nT |
dB_other | Magnetic stray field correction vector of all other sources (in VFM frame) | nT |
B_error | Error estimates on magnetic field vector BVFM (in VFM frame) | nT |
q_NEC CRF | Rotation from NEC frame to STR Common Reference Frame (CRF), quaternion (NEC ← CRF) | — |
Att_error | Error estimate on attitude information | degree/103 |
Flags_F | Flags characterizing the magnetic field intensity measurement: spikes or gap in data, discrepancy between ASM and VFM, etc. | — |
Flags_B | Flags characterizing the magnetic field vector measurement BVFM and BNEC: spikes or gap in data, discrepancy between ASM and VFM, etc. | — |
Flags_q | Flags characterizing the attitude information: identification of active heads, blinding, etc. | — |
Flags_Platform | Flags characterizing the spacecraft platform information: thruster activation, lack of telemetry, etc. | — |
ASM Freq_Dev | ASM reference frequency calibration data deviation for ASM stability assessment | Hz1/2 |