SAS 2 observations of the earth albedo gamma radiation above 35 MeV

Details SAS 2 observations of the earth albedo gamma radiation above 35 MeV SAS 2 observations of the earth albedo gamma radiation above 35 MeV

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.1265t&link_type=abstract

Journal of Geophysical Research, vol. 86, Mar. 1, 1981, p. 1265-1270.

Astronomy and Astrophysics

Astronomy

24

Earth Albedo, Earth Atmosphere, Gamma Rays, Sas-2, Terrestrial Radiation, Cosmic Rays, Energy Spectra, Gamma Ray Telescopes, Geomagnetism, Horizon, Incident Radiation

Scientific paper

The earth albedo gamma radiation above 35 MeV in the equatorial region is investigated using observations from the second Small Astronomy Satellite. The zenith angle distribution of the gamma radiation has a peak toward the horizon which is about an order of magnitude more intense than the radiation coming from the nadir, and nearly two orders of magnitude more intense than the gamma radiation from most parts of the sky. The gamma radiation originating from the western horizon is a factor of four more intense than the radiation from the eastern horizon and a factor of three more intense than that from the northern and southern directions. This reflects the geomagnetic effects on the incident cosmic rays whose interactions produce the albedo gamma rays. The variation of the upcoming gamma ray intensity with vertical cutoff rigidity is consistent with the empirical relationship found by Gur'yan et al. (1979).

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