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This work presents an investigation of the stochastic X-ray variability fromthe 164 Hz accreting millisecond pulsar IGR J17062-6143, based on regularobservations collected with the Neutron Star Interior Composition Explorerbetween 2017 July and 2020 August. Over this period, the power density spectrumshowed a stable morphology, with broad $\sim25\%$ rms band-limited noise below16 Hz. Quasi-periodic oscillations (QPOs) were occasionally observed, with themost notably detections including a low-frequency QPO centered at 2.7 Hz and asharp QPO centered at 115 Hz that may be a 2:3 resonance with the spinfrequency. Further, the energy dependence of the band-limited noise is studiedthrough a spectroscopic analysis of the complex covariance in two frequencyintervals. It is found that the power law continuum is the primary driver forthe observed variability, although the thermal (blackbody) emission alsoappears to be intrinsically variable in area ($5\%$ rms) and temperature ($1\%$rms). Notably, the 1 keV emission feature seen in all X-ray spectra of IGRJ17062-6143 varies with the same amplitude as the power law, but systematicallylags behind that continuum emission. These results appear consistent with ascenario in which a time variable Compton-scattering corona is the primarysource for the observed stochastic variability, with the variability observedin the emission feature and at the lowest photon energies being due to the diskreflection of the power law continuum.

The stochastic X-ray variability of the accreting millisecond pulsar IGR J17062-6143