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Super-Alfvenic particle streaming in astrophysical settingsThe pitch angle scattering of relativistic particles by self-generated hydromagnetic waves is discussed. It is shown that in a hot background plasma, because of the resonant damping of short wavelength waves by thermal protons, cosmic rays need not slow down to a mean streaming speed which is of order the Alfven speed. The effects of a high cosmic ray energy density upon the destabilized wave model are also discussed. Recent work indicates that when the cosmic ray energy density is on the order of or exceeds the energy density in the ambient magnetic field, the velocity of the amplified waves is significantly greater than the Alfven speed. These effects have important implications for recent cosmic ray acceleration models and are important for studies of particle propagation in many astrophysical plasmas.
Document ID
19800069054
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Holman, G. D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Morrison, P. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Scott, J. S.
(Maryland, University College Park, Md., United States)
Ionson, J. A.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1979
Subject Category
Space Radiation
Meeting Information
Meeting: Particle acceleration mechanisms in astrophysics
Location: La Jolla, CA
Start Date: January 3, 1979
End Date: January 5, 1979
Accession Number
80A53224
Distribution Limits
Public
Copyright
Other

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