High-Frequency Plasma Waves and Pitch Angle Scattering Induced by Pulsed Electron Beams

Delzanno, Gian Luca; Roytershteyn, Vadim

doi:10.1029/2019JA027046

Title: High-Frequency Plasma Waves and Pitch Angle Scattering Induced by Pulsed Electron Beams

Journal Article · Sat Sep 07 00:00:00 EDT 2019 · Journal of Geophysical Research. Space Physics

DOI:https://doi.org/10.1029/2019JA027046· OSTI ID:1569612

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Space Science Inst., Boulder, CO (United States)

Abstract Cherenkov radiation from a pulse of charge propagating along the magnetic field in a magnetized plasma is analyzed using theory and fluid‐kinetic simulations. Besides radiation into whistler modes, the subject of many previous investigations in laboratory and space, radiation can occur through extraordinary (X) modes. Theory and simulations demonstrate that X mode radiation efficiencies can be orders of magnitude higher than those into whistler modes. Test particle simulations of the dynamics of energetic electrons in the beam‐generated wavefield show that X modes can also induce pitch angle scattering much more efficiently than whistlers. While coherence effects associated with spreading of realistic beam pulses may limit the size of the X mode source region, a simple model of beam dynamics suggests that the size of this region could be substantial (hundreds of meters for ionospheric conditions). These results have potentially important implications for many problems, including understanding losses in the near‐Earth environment and radiation belt remediation.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1569612

Alternate ID(s):: OSTI ID: 1561408

Report Number(s):: LA-UR-17-30198; TRN: US2001274

Journal Information:: Journal of Geophysical Research. Space Physics, Vol. 124, Issue 9; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Title: High-Frequency Plasma Waves and Pitch Angle Scattering Induced by Pulsed Electron Beams

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