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arXiv · 2509.03562

Integrated effect of the cosmic space magnetic field on the acceleration noise of the TQ gravitational wave detection program

Cheng-Long Yu·Jin Yan·Lin Ji·Wen-Ke Shi·Yi Zhang·Run-Qiu Liu·Hong-Qing Huo
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Abstract

The TianQin(TQ) program is to deploy three satellites that can form an equilateral triangle in about 100,000 km Earth orbit to capture gravitational wave signals in the low-frequency band. In order to ensure accurate capture, noise needs to be analyzed and compensated. In this paper, we model and analyze the acceleration noise generated by the test mass affected by the magnetic field in space. In this paper, we use the Tsyganenko model as the background magnetic field of the TQ orbit, calculate the magnetic field and magnetic field gradient of the satellite orbit from 1997 to 2023, analyze the acceleration noise due to the coupling of the residual magnetic moment, the induced magnetic moment with the magnetic field in space and the acceleration noise due to the Lorentz force, and calculate the acceleration integrated noise of the influence of the magnetic field on the test mass from the power spectral densities of the modeled magnetic field and the magnetic field gradient. The acceleration integrated noise of the magnetic field influence on the test mass is calculated from the power spectral density of the magnetic field and the magnetic field gradient obtained by the model. Through the simulation study, the acceleration of the test mass induced by the magnetic field in the space of the TQ orbit reaches the magnitude of $10^{-16}ms^{-1}Hz^{-1/2}$, which is an important source of the influencing noise. The acceleration noise induced by the magnetic field and the Lorentz force is relatively higher than that induced by the magnetic field gradient.

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Cheng-Long Yu, Jin Yan, Lin Ji, Wen-Ke Shi, Yi Zhang, Run-Qiu Liu, Hong-Qing Huo. 2025-09-03. Integrated effect of the cosmic space magnetic field on the acceleration noise of the TQ gravitational wave detection program. https://arxiv.org/abs/2509.03562

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