Using the Earth’s magnetic field to distinguish positrons (blue) from electrons (red) arriving at the Fermi Large Area Telescope. The solid trajectories are forbidden because they lie in the Earth’s shadow. Selected for an Editors' Suggestion and a Synopsis in Physics.
From the article:
Measurement of Separate Cosmic-Ray Electron and Positron Spectra with the Fermi Large Area TelescopeM. Ackermann et al. (Fermi LAT Collaboration)
Phys. Rev. Lett. 108, 011103 (2012)
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