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TeV-range cosmic ray electrons and positrons (CREs) have been directlymeasured in the search for new physics or unknown astrophysical sources. CREscan inverse-Compton scatter solar photons and boost their energies into gammaray bands. Any potential CRE excess would enhance the resultant inverse Comptonemission spectrum in the relevant energy range, offering a new window to verifythe measured CRE spectrum. In this paper, we show that an excess in the TeVrange of the CRE spectrum, such as the one indicated by the DAMPE experiment,can induce a characteristic solar gamma ray signal. Accounting forcontamination from extragalactic gamma ray backgrounds (EGB), we forecast theDAMPE feature is testable ($\gtrsim 4 \sigma$) with a $\sim10^{5}\,\mathrm{m}^2\,{\rm yr}$ exposure in the off-disk direction. This can beachieved by long-exposure observations of water Cherenkov telescopes, such asLHAASO (7.2 years) and HAWC (25.9 years).

Solar gamma ray probe of local cosmic ray electrons