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Dark matter capture and annihilation in the Sun can produce detectablehigh-energy neutrinos, providing a probe of the dark matter-proton scatteringcross section. We consider the case when annihilation proceeds via long-liveddark mediators, which allows gamma rays to escape the Sun and reduces theattenuation of neutrinos. For gamma rays, there are exciting new opportunities,due to detailed measurements of GeV solar gamma rays with Fermi, andunprecedented sensitivities in the TeV range with HAWC and LHAASO. Forneutrinos, the enhanced flux, particularly at higher energies ($\sim$TeV),allows a more sensitive dark matter search with IceCube and KM3NeT. We showthat these search channels can be extremely powerful, potentially improvingsensitivity to the dark matter spin-dependent scattering cross section byseveral orders of magnitude relative to present searches for high-energy solarneutrinos, as well as direct detection experiments.

Powerful Solar Signatures of Long-Lived Dark Mediators