Top:electron flux from a free-streaming electron beam with an initial power-law distribution in velocity after t = 5 s (v0 = 1010 cm s−1, 0.33 c). Middle and bottom: simulated electron flux and spectral energy density from a propagating electron beam with an initial power-law distribution, with a set-up described in Reid & Kontar (2015), after t = 5 s of propagation.
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