September 22, 2021

MGF lv1b LR CDF Product


CASSIOPE SPACECRAFT (Swarm-E)
PROCESSED DATA HANDBOOK

MGF lv1b LR CDF Product

The MGF lv1b LR CDF Product is a daily product, providing MGF magnetic field data and associated parameters at 1 Hz.

Reference documents:
Swarm-Echo MGF lv1b Data Product Description
Swarm-Echo MGF lv1b Data Calibration Validation Report
Swarm-Echo MGF lv1b Release Notes

“CRF” in the table below refers to the “Common Reference Frame” of the spacecraft. See the coordinate systems page for more detail.

The Common Data Format (CDF) file is written to the International Solar-Terrestrial Physics (ISTP) standard. The CDF file contains the following fields:


AttributeDefinition
CalInboardInboard sensor 3×4 calibration matrix
CalOutboardOutboard sensor 3×4 calibration matrix
TimestampTime of observation (UTC, represented as CDF epoch in milliseconds since year zero)
SyncStatusTime synchronization status, source and quality
LatitudeCASSIOPE position in ITRF – Geocentric latitude (deg)
LongitudeCASSIOPE position in ITRF – Geocentric longitude (deg)
RadiusCASSIOPE position in ITRF – Geocentric Radius (m)
B_inboard_CRFInboard sensor magnetic field vector, CRF (spacecraft) frame (nT)
label_B_inbrdComponent label inboard CRF
B_outboard_CRFOutboard sensor magnetic field vector, CRF (spacecraft) frame (nT)
label_B_outbrdComponent label outboard CRF
B_CRFMagnetic field vector, CRF (spacecraft) frame (nT), ignore if q_Flags >= 128
label_B_CRFComponent label CRF
B_NEC_OutMagnetic field vector, NEC frame (nT), NaN if Flags_B >= 128
label_B_NECComponent label NEC
B_model_NECCHAOS Model magnetic field vector, NEC frame (nT)
label_modelComponent label NEC
dB_otherMagnetic stray field correction vector of all sources, CRF (spacecraft) frame (nT)
B_error_InB component error estimates for Inboard sensor, CRF frame (nT)
label_B_err_InComponent label CRF
B_error_OutB component error estimates for outboard sensor, CRF frame (nT)
label_B_err_OutComponent label CRF
q_NEC_CRFQuaternion transformation: NEC <– CRF, scalar last
Att_errorError estimates on attitude information (mdeg)
Flags_BBit flags for measurement issues:
0 = no flagged issues
4 = clipped measurement replaced with interpolated value
64 = padding around active magnetotorquer times
128 = torquer command active
Flags_qBit flags for attitude information:
0 = no flagged issues
1 = padding around rotations above 0.030 deg/sec
2 = spacecraft rotating more than 0.030 deg/sec
16 = padding for missing definitive attitude
32 = missing definitive attitude solution
Flags_PlatformError flags for Spacecraft platform
0 = no issues