Cosmic, galactic, and geomagnetic fields sharply limit electron cosmic ray energies

Classical Lienard radiation in the cosmic microwave background limits the energy of cosmic ray electrons and positrons (CREs) detected at Earth to about 1 PeV. Galactic magnetic fields deplete the flux of high-energy CREs anisotropically from the direction of the Milky Way center. A method is presented for adjusting the CRE spectrum above a few TeV to account for the geomagnetic field.