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The Need for Direct High-Energy Cosmic-Ray MeasurementsMeasuring the chemical composition of the cosmic rays in the energy region of greater than or equal to 10(exp 12)eV would be highly useful in settling several nagging questions concerning the propagation of cosmic rays in the galaxy. In particular an accurate measurement of secondary to primary ratios such as Boron to Carbon would gibe clear evidence as to whether the propagation of cosmic rays is determined by a diffusion coefficient that varies with the particle's energy as E(sup 0.5) or E(sup 0.3). This would go a long ways in helping us to understand the anistropy (or lack thereof) of the highest energy cosmic rays and the power requirements for producing those particles at approximately equal to 10(exp 18) eV which are believed to be highest energy particles produced in the Galaxy. This would be only one of the benefits of a mission such as ACCESS to perform direct particle measurements on very high energy cosmic rays.
Document ID
20040040134
Document Type
Conference Paper
Authors
Jones, Frank C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Streitmatter, Robert (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Subject Category
Astronomy
Meeting Information
American Physical Society Meeting(Denver, CO)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.