Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.1055g&link_type=abstract
Journal of Geophysical Research, vol. 82, Mar. 1, 1977, p. 1055-1060.
Astronomy and Astrophysics
Astronomy
8
Angular Distribution, Atmospheric Radiation, Bremsstrahlung, Gamma Rays, High Altitude Balloons, Compton Effect, Electron Flux Density, Monte Carlo Method, X Ray Astronomy
Scientific paper
A simple model is developed in order to interpret the recently measured zenith angle distribution of MeV gamma rays in the upper atmosphere, which shows a maximum of intensity at angles around 120 degrees (upward moving direction). Because gamma ray production by electron bremsstrahlung is by far the most important process in this energy range, an attempt has been made to derive the gamma ray source functions within the atmosphere from measured electron fluxes. The transport of gamma rays from their source position to the detector altitude is simulated in a Monte Carlo calculation. The calculation shows that the observed maximum around zenith angles of 120 degrees is caused by those gamma rays which were originally ejected preferentially in the horizontal direction but which were Compton-scattered on their way to the detector.
Graser Uwe
Schoenfelder Volker
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