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This white paper discusses the current landscape and prospects forexperiments sensitive to particle dark matter processes producing photons andcosmic rays. Much of the gamma-ray sky remains unexplored on a level ofsensitivity that would enable the discovery of a dark matter signal. Currentlyoperating GeV-TeV observatories, such as Fermi-LAT, atmospheric Cherenkovtelescopes, and water Cherenkov detector arrays continue to target severalpromising dark matter-rich environments within and beyond the Galaxy. Soon,several new experiments will continue to explore, with increased sensitivity,especially extended targets in the sky. This paper reviews the severalnear-term and longer-term plans for gamma-ray observatories, from MeV energiesup to hundreds of TeV. Similarly, the X-ray sky has been and continues to bemonitored by decade-old observatories. Upcoming telescopes will further bolstersearches and allow new discovery space for lines from, e.g., sterile neutrinosand axion-photon conversion. Furthermore, this overview discusses currentlyoperating cosmic-ray probes and the landscape of future experiments that willclarify existing persistent anomalies in cosmic radiation and spearheadpossible new discoveries. Finally, the article closes with a discussion ofnecessary cross section measurements that need to be conducted at colliders toreduce substantial uncertainties in interpreting photon and cosmic-raymeasurements in space.

Snowmass2021 Cosmic Frontier: The landscape of cosmic-ray and high-energy photon probes of particle dark matter