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MICROSCOPE's space test of the weak equivalence principle (WEP) is based onthe minute measurement of the difference of accelerations experienced by twotest masses as they orbit the Earth. A detection of a violation of the WEPwould appear at a well-known frequency $f_{\rm EP}$ depending on thesatellite's orbital and spinning frequencies. Consequently, the experiment wasoptimised to miminise systematic errors at $f_{\rm EP}$. Glitches areshort-lived events visible in the test masses' measured acceleration, mostlikely originating in cracks of the satellite's coating. In this paper, wecharacterise their shape and time distribution. Although intrinsically random,their time of arrival distribution is modulated by the orbital and spinningperiods. They have an impact on the WEP test that must be quantified. However,the data available prevents us from unequivocally tackling this task. We showthat glitches affect the test of the WEP, up to an a priori unknown level.Discarding the perturbed data is thus the best way to reduce their effect.

MICROSCOPE mission: Statistics and impact of glitches on the test of the weak equivalence principle