Brown, J. W. and Stone, E. C. and Vogt, R. E.
(1973)
The Elemental Abundance Ratios of Interstellar Secondary and Primary Cosmic Rays.
In:
Proceedings of the 13th International Cosmic Ray Conference.
Colorado Associated University Press
, Denver, CO, pp. 556-561.
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Abstract
The rigidity dependence of the ratios. of abundances of interstellar
secondary and primary cosmic rays contains important
information on their confinement and propagation in the Galaxy.
Recent results suggest that high energy cosmic rays (> 20 GeV/nucleon)
have propagated through much less interstellar matter than
lower energy nuclei (< 1 GeV/nucleon). We report new observations
of abundances in the charge range 2 ≤ Z ≤ 10, which were obtained
with a dE/dx-Cerenkov detector launched into a polar orbit on OGO-6
as part of the Caltech Solar and Galactic Cosmic Ray Experiment.
Integral rigidity spectra of all the elements observed have shapes
similar to that of the helium spectrum in the rigidity range ~ 2
to ~ 14 GV, approaching a power law with exponent -1.6 above 8 GV.
Calculations of interstellar propagation assuming a steady-state
model and including the presence of interstellar helium and the
effects of solar modulation predict a variation with rigidity of
ratios such as Be/O and B/O, which is not observed. The data can
be explained by assuming a rigidity-dependent confinement of
cosmic rays within the Galaxy.
| Item Type: | Book Section |
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| Contact Email Address: | dmiles@caltech.edu |
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| Additional Information: | © 1973 University of Colorado.
Provided by the NASA Astrophysics Data System.
Dr. S. S. Murray made significant contributions
to the OGO-6 program. Dr. J. Audouze kindly provided us with a copy of
the computer program for the propagation calculation and provided us
with cross section data. Dr. M. Shea kindly supplied us with detailed
geomagnetic cutoff data, and Dr. T. L. Garrard supplied the solar
modulation program. We appreciate discussions with Dr. C. Cesarsky.
One of us (Brown) received support from the National Science Foundation,
while another (Stone) was an Alfred P. Sloan research fellow. This work
was supported in part by NASA contract NAS5-9312 and grant NGR 05-002-160.
Space Radiation Laboratory
SRL ID #: 1973-07. |
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| Group: | Space Radiation Laboratory |
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| Funders: | | Funding Agency | Grant Number |
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| NASA | NAS5-9312 | | NASA | NGR 05-002-160 |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Space Radiation Laboratory | 1973-07 |
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| Record Number: | CaltechAUTHORS:20140409-090240805 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140409-090240805 |
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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| ID Code: | 44807 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
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| Deposited On: | 10 Apr 2014 20:46 |
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| Last Modified: | 20 Feb 2020 14:33 |
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