High-Energy Galactic Cosmic Rays (Astro2020 Science White Paper)

Understand

The origin of the highest energy Galactic cosmic rays is still not understood, nor is the transition to EeV extragalactic particles.

• Scientific progress requires enhancements of existing air-shower arrays, such as: IceCube with its surface detector IceTop, and the low-energy extensions of both the Telescope Array and the Pierre Auger Observatory.