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The Charge and Isotopic Composition of Solar Cosmic Rays

Published online by Cambridge University Press:  25 May 2016

Frank B. McDonald
Frank B. McDonald*
Affiliation:
NASA Goddard Space Flight Center, Greenbelt, Md., U.S.A.

Abstract

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The charge and isotopic composition of solar cosmic rays potentially contain a wealth of information on the acceleration and confinment of energetic particles at the Sun. As the experimental techniques have improved and with the increasing number of measurements, this potential is now being realized. It is convenient to divide the composition studies into three areas: (a) helium-iron, with energies >10 MeV nuc−1; (b) helium-iron, and the trans-iron elements, with energies <2 MeV nuc−1; (c) the isotopic composition. In the first area at energies above 10 MeV nuc−1 the solar cosmic rays appear to provide a representative sample of the solar corona. At lower energies (b) complex enhancement effects are noted. These increase with Z and decrease with energy. This result as well as the high abundance of 3He suggest that the acceleration process is not a simple one and probably several stages are required.

Type
Part IV Acceleration, Containement and Emission of High-Energy Flare Particles
Information
Symposium - International Astronomical Union , Volume 57: Coronal Disturbances , 1974 , pp. 415 - 420
Copyright
Copyright © Reidel 1974 

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