Angular distribution of Bremsstrahlung photons and of positrons for calculations of terrestrial gamma-ray flashes and positron beams

  title={Angular distribution of Bremsstrahlung photons and of positrons for calculations of terrestrial gamma-ray flashes and positron beams},
  author={Christoph Kohn and Ute Ebert},
  journal={Atmospheric Research},
Abstract Within thunderstorms electrons can gain energies of up to hundred(s) of MeV. These electrons can create X-rays and gamma-rays as Bremsstrahlung when they collide with air molecules. Here we calculate the distribution of angles between incident electrons and emitted photons as a function of electron and photon energy. We derive these doubly differential cross-sections by integrating analytically over the triply differential cross-sections derived by Bethe and Heitler; this is… Expand
The importance of electron-electron bremsstrahlung for terrestrial gamma-ray flashes, electron beams and electron-positron beams
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 areExpand
Energy resolved positron and hadron spectrum produced by a negative stepped lightning leader
Gamma-ray flashes with quantum energies up to 40 MeV and beams of electrons and positrons have been detected by satellites above thunderclouds. We here adopt the model of an upward moving negativeExpand
Calculation of beams of positrons, neutrons and protons associated with terrestrial gamma-ray flashes
Positron beams have been observed by the Fermi satellite to be correlated with lightning leaders, and neutron emissions have been attributed to lightning and to laboratory sparks as well. Here weExpand
Production mechanisms of leptons, photons, and hadrons and their possible feedback close to lightning leaders
The feedback mechanism together with the field enhancement by lightning leaders yields particle energies even above 40 MeV measurable at satellite altitudes, because of their high rest mass hadrons are measurable on a longer time scale than leptons and photons. Expand
The structure of ionization showers in air generated by electrons with 1 MeV energy or less
Ionization showers are created in the Earth's atmosphere by cosmic particles or by run-away electrons from pulsed discharges or by the decay of radioactive elements like radon and krypton. TheseExpand
A review of electron–nucleus bremsstrahlung cross sections between 1 and 10 MeV
Abstract More than 80 years have passed since the first calculations of electron–nucleus bremsstrahlung cross sections were published by Sommerfeld, for non-relativistic electrons, and,Expand
The Emission of Terrestrial Gamma Ray Flashes From Encountering Streamer Coronae Associated to the Breakdown of Lightning Leaders
Terrestrial gamma ray flashes (TGFs) are beams of high-energy photons associated to lightning. These photons are the bremsstrahlung of energetic electrons whose origin is currently explained by twoExpand
Analyzing x-ray emissions from meter-scale negative discharges in ambient air
textabstractWhen voltage pulses of 1 MV drive meter long air discharges, short and intense bursts of x-rays are measured. Here we develop a model for electron acceleration and subsequent photonExpand
Precision measurement of electron and positron flux in cosmic rays with the AMS-02 Detector
The cosmic ray electron and positron flux measurement can address a series of astrophysics and particle physics questions. This thesis presents an analysis of electron and positron flux from 0.5 GeVExpand
Relativistic Runaway Electron Avalanches Inside the High Field Regions of Thunderclouds
Relativistic Runaway Electron Avalanches Inside the High Field Regions of Thunderclouds by Eric Scott Cramer Dissertation Advisor: Hamid K. Rassoul, Ph.D. In this dissertation, simplified equationsExpand


Bremsstrahlung spectra from electron interactions with screened atomic nuclei and orbital electrons
Abstract Through the synthesis of various theoretical results, a comprehensive set of bremsstrahlung cross sections (differential in the energy of the emitted photons) has been prepared. The setExpand
Triply differential cross section and polarization correlations in electron bremsstrahlung emission.
  • Shaffer, Tong, Pratt
  • Physics, Medicine
  • Physical review. A, Atomic, molecular, and optical physics
  • 1996
A reformulation of the relativistic bremsstrahlung code of Tseng and Pratt is reported, again utilizing partial-wave and multipole expansions in a screened potential within the independent particle approximation, but differently organizing their summation. Expand
High‐energy electron beams launched into space by thunderstorms
[1] Using CGRO/BATSE data, a possible new source of high-energy electrons and positrons in the earth's inner magnetosphere is presented. These particles are generated within the upper atmosphere byExpand
The Elementary Process of Bremsstrahlung
Abstract In this report we review the experimental and theoretical developments concerning the elementary process of electron bremsstrahlung. The term “elementary process” means that not only theExpand
Erratum: Pair production and bremsstrahlung of charged leptons
Photo pair productions of electrons, muons and heavy leptons and bremsstrahlung of electrons and muons are reviewed. Atomic and nuclear form factors necessary for these calculations are discussed.Expand
The relativistic feedback discharge model of terrestrial gamma ray flashes
[1] As thunderclouds charge, the large-scale fields may approach the relativistic feedback threshold, above which the production of relativistic runaway electron avalanches becomes self-sustainingExpand
Downward emission of runaway electrons and bremsstrahlung photons in thunderstorm electric fields
[1] Intensive radiations presumably associated with lightning activities have sometimes been detected around nuclear facilities in Japan. In order to investigate the generation of bremsstrahlungExpand
Terrestrial gamma-ray flashes as powerful particle accelerators.
It is determined that the TGF emission above 10 MeV has a significant power-law spectral component reaching energies up to 100 MeV, and these results challenge TGF theoretical models based on runaway electron acceleration. Expand
Triply-differential cross sections for ionisation of hydrogen atoms by electrons and positrons
A derivation is given of the exact form of the three-body Coulomb wavefunction in the asymptotic region where the separation of all particles tends to infinity. Using a modification of the method ofExpand
LPM effect and pair production in the geomagnetic field: a signature of ultra-high energy photons in the Pierre Auger Observatory
Abstract The presence of photons in the cosmic rays of highest energy (above 1020 eV) would be a strong indication of a “top–down” production mechanism, e.g. the decay of topological defects. TheExpand