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(Abridged) Our deep multiwavelength campaign on NGC 5548 revealed anunusually strong X-ray obscuration. The resulting dramatic decrease in incidentionizing flux allowed us to construct a comprehensive physical, spatial andtemporal picture for the long-studied AGN wind in this object. Here we analyzethe UV spectra of the outflow acquired during the campaign as well as from fourprevious epochs. We find that a simple model based on a fixed totalcolumn-density absorber, reacting to changes in ionizing illumination, matchesthe very different ionization states seen in five spectroscopic epochs spanning16 years. Absorption troughs from C III* appeared for the first time during ourcampaign. From these troughs, we infer that the main outflow component issituated at 3.5+-1 pc from the central source. Three other components aresituated between 5-70 pc and two are further than 100 pc. The wealth ofobservational constraints and the disparate relationship of the observed X-rayand UV flux between different epochs make our physical model a leadingcontender for interpreting trough variability data of quasar outflows.

Anatomy of the AGN in NGC 5548: II. The Spatial, Temporal and Physical Nature of the Outflow from HST/COS Observations