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The winds of hot, massive stars are variable from processes happening on bothlarge and small spatial scales. A particular case of such wind variability is'discrete-absorption components' (DACs) that manifest themselves as outwardmoving density features in UV resonance line spectra. Such DACs are believed tobe caused by large-scale spiral-shaped density structures in the stellar wind.We consider novel 3-D radiation-hydrodynamic models of rotating hot star windsand study the emergence of co-rotating spiral structures due to a local(pseudo-)magnetic spot on the stellar surface. Subsequently, the hydrodynamicmodels are used to retrieve DAC spectral signatures in synthetic UV spectracreated from a 3-D short characteristics radiative transfer code.

Discrete Absorption Components from 3-D spot models of hot star winds