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We describe in detail how perturbations due to the planets can cause asub-population of WIMPs captured by scattering in surface layers of the Sun toevolve to have orbits which no longer intersect the Sun. We argue that suchWIMPs, if their orbit has a semi-major axis less than 1/2 of Jupiter's, canpersist in the solar system for cosmological timescales. This leads to a new,previously unanticipated WIMP population intersecting the Earth's orbit. TheWIMP-nucleon cross sections required for this population to be significant areprecisely those in the range predicted for SUSY dark matter, lying near thepresent limits obtained by direct underground dark matter searches usingcyrogenic detectors. Thus, if a WIMP signal is observed in the next generationof detectors, a potentially measurable signal due to this new population mustexist. This signal, lying in the keV range for Germanium detectors, would becomplementary to that of galactic halo WIMPs. A comparison of event rates,anisotropies, and annual modulations would not only yield additionalconfirmation that any claimed signal is indeed WIMP-based, but would also allowone to gain information on the nature of the underlying dark matter model.Comment: Revtex, 37 pages including 6 figures, accepted by Phys. Rev D.  (version to be published, including changes made in response to referees  reports

New WIMP population in the solar system and new signals for dark-matter detectors