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A measurement of the absolute energy spectra of galactic cosmic rays during the 1976-77 solar minimumAn instrument designed to measure elemental cosmic ray abundances from boron to nickel in the energy region 0.5-2.0 GeV/nucl was flown on a high altitude balloon from Sioux Falls, South Dakota, on 30 September through 1 October 1976 at an average atmospheric depth of about 5 g/sq cm. Differential energy spectra of B, C, N, O, Ne, Mg, Si and Fe, extrapolated to the top of the atmosphere, were measured. The float altitude exposure of 17 h ended near Alpena, Michigan. The flight trajectory maintained a north easterly heading out of Sioux Falls traversing the upper midwest region between 84 and 97 deg west longitude while remaining between 43.5 and 45 deg north latitude. The maximum vertical cut-off for this flight path was 1.77 GV or 0.35 GeV/nucl.
Document ID
19930066374
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Derrickson, J. H.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Parnell, T. A.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Austin, R. W.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Selig, W. J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Gregory, J. C.
(Alabama Univ. Huntsville, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: International Journal of Radiation Applications and Instrumentation, Part D: Nuclear Tracks and Radiation Measurements
Volume: 20
Issue: 3
ISSN: 0735-245X
Subject Category
Space Radiation
Accession Number
93A50371
Distribution Limits
Public
Copyright
Other

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