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. The China Seismo-Electromagnetic Satellite (CSES) waslaunched in February 2018 into a polar, sun-synchronous, low Earth orbit. Itprovides the first demonstration of the Coupled Dark State Magnetometer(CDSM) measurement principle in space. The CDSM is an optical scalarmagnetometer based on the coherent population trapping (CPT) effect andmeasures the scalar field with the lowest absolute error aboard CSES.Therefore, it serves as the reference instrument for the measurements doneby the fluxgate sensors within the High Precision Magnetometer instrumentpackage. In this paper several correction steps are discussed in order to improve theaccuracy of the CDSM data. This includes the extraction of valid 1 Hz data,the application of the sensor heading characteristic, the handling ofdiscontinuities, which occur when switching between the CPT resonancesuperpositions, and the removal of fluxgate and satelliteinterferences. The in-orbit performance is compared to the Absolute Scalar Magnetometeraboard the Swarm satellite Bravo via the CHAOS magnetic field model.Additionally, an uncertainty of the magnetic field measurement is derivedfrom unexpected parametric changes of the CDSM in orbit in combination withperformance measurements on the ground.

In-orbit results of the Coupled Dark State Magnetometer aboard the China Seismo-Electromagnetic Satellite