Dark matter may interact with the Standard Model through the kinetic mixing of dark photons , A ^ { \prime } , with Standard Model photons .
Such dark matter will accumulate in the Sun and annihilate into dark photons .
The dark photons may then leave the Sun and decay into pairs of charged Standard Model particles that can be detected by the Alpha Magnetic Spectrometer .
The directionality of this “ dark sunshine ” is distinct from all astrophysical backgrounds , providing an opportunity for unambiguous dark matter discovery by AMS .
We perform a complete analysis of this scenario including Sommerfeld enhancements of dark matter annihilation and the effect of the Sun ’ s magnetic field on the signal , and we define a set of cuts to optimize the signal probability .
With the three years of data already collected , AMS may discover dark matter with mass 1 ~ { } \text { TeV } \lesssim m _ { X } \lesssim 10 ~ { } \text { TeV } , dark photon masses m _ { A ^ { \prime } } \sim \mathcal { O } ( 100 ) MeV , and kinetic mixing parameters 10 ^ { -11 } \lesssim \varepsilon \lesssim 10 ^ { -8 } .
The proposed search extends beyond existing beam dump and supernova bounds , and it is complementary to direct detection , probing the same region of parameter space .