The importance of electron-electron bremsstrahlung for terrestrial gamma-ray flashes, electron beams and electron-positron beams

Autor(es)

Kohn, C. ^[1] ; Ebert, U. ^{[1, 2]} ; Mangiarotti, A. ^[3]

Afiliação do(s) autor(es)

^[1] CWI, NL-1090 GB Amsterdam - Netherlands

^[2] Eindhoven Univ Technol, NL-5600 MB Eindhoven - Netherlands

^[3] Univ Sao Paulo, Inst Fis, BR-05508 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS D-APPLIED PHYSICS; v. 47, n. 25 JUN 25 2014.
• Citações Web of Science: 11

Resumo

Thunderstorms emit terrestrial gamma-ray flashes with photon energies of up to tens of MeV and electron-positron beams that are created by photons with energies above 1.022 MeV. These photons are produced through the bremsstrahlung process when energetic electrons collide with air molecules. However, presently used cross sections for bremsstrahlung treat only the interaction of the electrons with the nuclei of molecules while we here include their interaction with shell electrons. We simulate the production of energetic photons by a negative stepped lightning leader, and we find that electron-electron bremsstrahlung contributes significantly, although the direct photon emission is less than from electron-nucleus bremsstrahlung. However, electron-electron bremsstrahlung also ejects shell electrons and therefore feeds the electron population above 1 MeV significantly. We find that it hence dominates the photon spectrum of the stepped lightning leader at 10 MeV. (AU)

• Processo FAPESP: 13/15634-5 - Estudo das propriedades do bremsstrahlung na faixa de energia de alguns MeV
• Beneficiário: Marcos Nogueira Martins
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional