Physics – Plasma Physics
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10217359a&link_type=abstract
Journal of Geophysical Research, Volume 102, Issue A8, p. 17359-17364
Physics
Plasma Physics
Interplanetary Physics: Cosmic Rays, Ionosphere: Ionization Mechanisms, Solar Physics, Astrophysics, And Astronomy: X Rays, Gamma Rays, And Neutrinos, Space Plasma Physics: Charged Particle Motion And Acceleration
Scientific paper
We present results of atmospheric gamma ray measurements obtained during two balloon flights from Alice Springs, Australia (λ=-29°), and Fort Summer, New Mexico, United States of America (λ=43°) at geomagnetic cutoff rigidities of 8.5 GV and 4.3 GV, respectively. The fluxes, in the energy range of 1-15 MeV, are derived as functions of zenith angle, residual depth, and latitudinal rigidity. We find while the downward moving gamma ray flux at the float level (4.8gcm-2) is not a strong function of rigidity the upward flux at λ=-29° is, on average, by factors of 2 to 4 lower than at λ=43°. The energy spectra of the downward moving gamma rays at various altitudes are harder than the upward moving gamma rays. The spectral indices for both upward and downward fluxes at λ=-29° are lower than at λ=43°.
Akyuz A.
Bhattacharya Dipen
Chuang K. W.
Dixon David D.
O'Neill Terrence J.
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