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Balloon measurements of the energy spectrum of cosmic electrons between 1 GeV and 25 GeVDuring three balloon flights made in 1966 and 1967, cosmic electrons were investigated with the aid of a hodoscope detector which provided extensive and detailed information on each cosmic ray event triggering the apparatus. Similar information obtained during calibration exposures to protons and pions as well as to electrons was used to provide identification of cosmic electrons and to determine their energies. Differential primary electron intensities measured in the range from 1 GeV to 25 GeV were substantially larger than some earlier measurements. Taken in conjunction with existing measurements at energies above 100 GeV, this indicates that the energy spectrum of cosmic electrons is steeper than that of cosmic-ray nuclei and, consequently, suggests that Compton/synchrotron energy loss plays a significant role in shaping the electron spectrum.
Document ID
19720006108
Document Type
Contractor Report (CR)
Authors
Earl, J. A.
(Maryland Univ. College Park, MD, United States)
Neely, D. E.
(Maryland Univ. College Park, MD, United States)
Rygg, T. A.
(Maryland Univ. College Park, MD, United States)
Date Acquired
September 2, 2013
Publication Date
September 1, 1971
Subject Category
Space Radiation
Report/Patent Number
NASA-CR-124735
TR-72-038
Funding Number(s)
CONTRACT_GRANT: NGR-21-002-008
CONTRACT_GRANT: NGR-21-002-066
CONTRACT_GRANT: NONR-710(19)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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