The Primary Specific Ionization and Intensity of the Cosmic Radiation above the Atmosphere at the Geomagnetic Equator

Details The Primary Specific Ionization and Intensity of the Cosmic Radiation above the Atmosphere at the Geomagnetic Equator The Primary Specific Ionization and Intensity of the Cosmic Radiation above the Atmosphere at the Geomagnetic Equator

Oct 1950

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1950phrv...80...47s&link_type=abstract

Physical Review, vol. 80, Issue 1, pp. 47-51

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Directional intensities and the primary specific ionization of the charged cosmic-ray flux above the atmosphere were measured by means of a G-M counter telescope in an Aerobee sounding rocket launched at the geomagnetic equator. The intensity at a zenith angle of 45° averaged over all azimuths, was found to be 0.04 particle sec.-1 cm-2 steradian-1, of which not more than 65 percent can be attributed to primaries, the remainder being due to albedo. The low value (~40 percent) of the observed east-west asymmetry is most directly explainable in terms of positive proton primaries and a large albedo flux at large zenith angles, although a small contribution of negative primaries cannot be excluded. The primary specific ionization of the radiation above the atmosphere is found to be essentially the same as that of the sea-level radiation, indicating a predominance of singly charged particles of near minimum ionization. This result strongly suggests that the albedo radiation at the equator does not consist of low energy (<100 Mev) protons. Most of the properties of bursts produced in a small lead block can be accounted for reasonably in terms of known initiating particles and interactions.

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