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Following our earlier work on the 3-dimensional effective velocitydistribution of Galactic WIMPs (not only impinging on our detectors but also)scattering off target nuclei, in this paper, we demonstrate the normal and a"reverse" annual modulations of elastic WIMP-nucleus scattering signals, whichcould be observed in direct Dark Matter detection experiments. Our simulationsshow that, once the WIMP mass is as light as only a few tens GeV, the eventnumber and the accumulated recoil energy of WIMP-induced scattering events offboth of light and heavy target nuclei would indeed be maximal (minimal) insummer (winter). However, once the WIMP mass is as heavy as a few hundreds GeV,the event number and the accumulated recoil energy of WIMP scattering eventsoff heavy nuclei would inversely be minimal in summer. Understandably, for anintermediate WIMP mass, the event number and the accumulated recoil energy ofscattering events off some middle-mass nuclei would show an approximatelyuniform time dependence.

Normal and Reverse Annual Modulations of Elastic WIMP-Nucleus Scattering Signals