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Heavy solar cosmic rays in the January 25, 1971 solar flaresA detailed study of the charge composition of heavy solar cosmic rays measured in the January 25, 1971 solar flare including differential fluxes for the even charged nuclei from carbon through argon is presented. The measurements are obtained for varying energy intervals for each nuclear species in the energy range from 10 to 35 MeV/nucleon. In addition, abundances relative to oxygen are computed for all the above nuclei in the single energy interval from 15 to 25 MeV/nucleon. This interval contains measurements for all of the species and as a result requires no spectral extrapolations. An upper limit for the abundance of calcium nuclei is also presented. These measurements, when combined with other experimental results, enable the energy dependence of abundance measurements as a function of nuclear charge to be discussed. It is seen that at energies above about 10 MeV/nucleon, the variations of abundance ratios are limited to about a factor of 3 from flare to flare, in spite of large variations in other characteristics of these solar events.
Document ID
19740024131
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Pellerin, C. J., Jr. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 3, 2013
Publication Date
August 1, 1974
Subject Category
Space Radiation
Report/Patent Number
NASA-TM-X-70731
X-662-74-231
Accession Number
74N32244
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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