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Document Type:Latin Dissertation
Language of Document:English
Record Number:54520
Doc. No:TL24474
Call number:‭3191310‬
Main Entry:Lauren M. Scott
Title & Author:Cosmic-ray energy loss in the heliosphere and interstellar reaccelerationLauren M. Scott
College:Washington University in St. Louis
Date:2005
Degree:Ph.D.
student score:2005
Page No:218
Abstract:Using data collected by the Cosmic Ray Isotope Spectrometer (CRIS) on the NASA Advanced Composition Explorer (ACE) spacecraft, I report on measurements of Galactic Cosmic Ray isotopes in the energy range from 50 to 550 MeV/nucleon, with emphasis on the electron-capture-decay secondaries, 37Cl, 41Ca, 44Ti, 49V, 51Cr, 55Fe and 57Co. These isotopes, which decay only by electron-capture, are effectively stable in the cosmic rays at high energies where electron attachment is unlikely; at lower energies substantial electron attachment and decay does occur. By comparing the daughter-to-parent abundance ratios 49Ti/ 49V and 51V/51Cr during periods of solar minimum and solar maximum, I report new direct evidence of changes in the amount of energy loss that occurs in cosmic rays between solar minimum and solar maximum. Comparison of the electron-capture-decay abundance ratios with propagation models in the context of reacceleration are also presented. Analysis shows that little or no reacceleration is needed to correctly predict the energy-dependence of the electron-capture abundance ratios.
Subject:Pure sciences; Earth sciences; Cosmic ray; Energy loss; Heliosphere; Reacceleration; Astronomy; Astrophysics; Geophysics; 0606:Astrophysics; 0606:Astronomy; 0373:Geophysics
Added Entry:M. H. Israel
Added Entry:Washington University in St. Louis