The Energy Spectrum of the Heavy Primary Cosmic Rays

Details The Energy Spectrum of the Heavy Primary Cosmic Rays The Energy Spectrum of the Heavy Primary Cosmic Rays

Oct 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964rspsa.281..553d&link_type=abstract

Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 281, Issue 1387, pp. 553-564

Physics

4

Scientific paper

The magnetic rigidity spectrum of primary cosmic rays with Z >=slant 6, in the rigidity interval 2.5 to 16.0 GV, has been determined by means of a Cerenkov counter carried in the satellite Ariel. The integral spectrum shows a well-defined change in slope near 8.5 GV, indicating that this is probably the upper limit to the solar modulation process at this time (May and June 1962). In the rigidity interval covered by these measurements the integral spectrum is adequately represented by a power law with an exponent ca. 1.2 below 8.5 GV and ca. 1.5 above this rigidity. Under the plausible assumption that the integral galactic spectrum of these particles is represented by a power law with exponent 1.5, it follows that the solar modulation process in the 2.5 to 8.5 GV region is of the form J_E = J_∞[p/p_0]0.3, where J_E is the intensity at the Earth of particles with rigidity greater than p, where p is in GV, J_∞ is the corresponding intensity outside the solar system, and p_0 ~ 8.5.

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