Other
Scientific paper
Feb 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964phrv..133..818f&link_type=abstract
Physical Review, vol. 133, Issue 3B, pp. 818-827
Other
8
Scientific paper
The energy spectra of low-energy primary cosmic-ray hydrogen and helium nuclei have been determined from nuclear emulsions flown on a high-altitude balloon launched from Forth Churchill on 8 July 1961. The flight was preceded by a period of three months of low solar and geophysical activity. The results indicated that the differential spectrum of hydrogen nuclei in this low-energy interval decreased toward low energies and did not exhibit the sharp rise found with counters in 1960 and 1961 by other experimenters. The low-energy differential spectrum and integral flux value for helium nuclei were found to be intermediate between those typical of solar minimum and solar maximum and are consistent with a modulation mechanism which yields the same rigidity spectrum for a given intensity both before and after solar maximum. Various modulation models of galactic cosmic rays are examined, and it is concluded that none of them seem to be entirely adequate.
Fichtel Carl E.
Guss Donald E.
Stevenson G. R.
Waddington Jake C.
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