Abstract
Abstract. The China Seismo-Electromagnetic Satellite (CSES) was launched in February 2018 into a polar, sun-synchronous, low Earth orbit. It provides the first demonstration of the Coupled Dark State Magnetometer (CDSM) measurement principle in space. The CDSM is an optical scalar magnetometer based on the coherent population trapping (CPT) effect and measures the scalar field with the lowest absolute error aboard CSES. Therefore, it serves as the reference instrument for the measurements done by the fluxgate sensors within the High Precision Magnetometer instrument package. In this paper several correction steps are discussed in order to improve the accuracy of the CDSM data. This includes the extraction of valid 1 Hz data, the application of the sensor heading characteristic, the handling of discontinuities, which occur when switching between the CPT resonance superpositions, and the removal of fluxgate and satellite interferences. The in-orbit performance is compared to the Absolute Scalar Magnetometer aboard the Swarm satellite Bravo via the CHAOS magnetic field model. Additionally, an uncertainty of the magnetic field measurement is derived from unexpected parametric changes of the CDSM in orbit in combination with performance measurements on the ground.
Highlights
The China Seismo-Electromagnetic Satellite (CSES), known as Zhangheng-1, investigates natural electromagnetic phenomena and possible applications for earthquake monitoring from space (Shen et al, 2018)
The China Seismo-Electromagnetic Satellite (CSES) mission provides the first demonstration of the Coupled Dark State Magnetometer (CDSM) measurement principle in space
This includes the extraction of valid 1 Hz data, the application of the sensor heading characteristic, the handling of discontinuities, which occur when switching between the coherent population trapping (CPT) resonance superpositions, and the removal of fluxgate and satellite interferences
Summary
The China Seismo-Electromagnetic Satellite (CSES), known as Zhangheng-1, investigates natural electromagnetic phenomena and possible applications for earthquake monitoring from space (Shen et al, 2018). The CPT resonance n = 0 is excited by the two light fields denoted by the black dashed arrowed lines in Fig. 1 and occurs under certain conditions when the frequency difference of both first-order sidebands of this FM spectrum fits the energy difference of the 52S1/2 ground states F = 1, mF = 0 and F = 2, mF = 0. This resonance is used to adjust the microwave oscillator frequency to changes in νHFS and to compensate for a temperature-dependent drift of the electronics. 44270 is the identifier for the daytime ascending segment of orbit 4427
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