Parallel velocity mixing yielding enhanced electron heating during magnetic pumping

Magnetic wave perturbations are observed in the solar wind and vicinity of Earth's bow shock. For such environments, recent work on magnetic pumping with electrons trapped have demonstrated possibility efficient energization superthermal electrons. Here we also analyze energetic for which transit time through system is short compared to scales associated field evolution. In particular, considering an idealized configuration show how trapping/detrapping magnetized can cause effective parallel velocity diffusion. This diffusion, combined naturally occurring mechanisms known pitch angle scattering, as Whistler waves, produces enhanced heating rates pumping. We find that at low scattering mechanism enhances beyond predictions theory