George, J. S. and Wiedenbeck, M. E. and Binns, W. R. and Christian, E. R. and Cummings, A. C. and Hink, P. L. and Leske, R. A. and Mewaldt, R. A. and Stone, E. C. and von Rosenvinge, T. T. and Yanasak, N. E. (2001) The Phosphorus/Sulfur Abundance Ratio as a Test of Galactic Cosmic-Ray Source Models. In: Solar and Galactic Composition. AIP Conference Proceedings. No.598. American Institute of Physics , Melville, N.Y., pp. 263-268. ISBN 0-7354-0042-3 http://resolver.caltech.edu/CaltechAUTHORS:20111117-112058199
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Galactic cosmic-ray (GCR) elemental abundances display a fractionation compared to solar-system values that appears ordered by atomic properties such as the first ionization potential (FIP) or condensation temperature (volatility). Determining which parameter controls the observed fractionation is crucial to distinguish between GCR origin models. The Cosmic-Ray Isotope Spectrometer (CRIS) instrument on board NASA's Advanced Composition Explorer (ACE) spacecraft can measure the abundances of several elements that break the general correlation between FIP and volatility (e.g., Na, P, K, Cu, Zn, Ga, and Ge). Phosphorus is a particularly interesting case as it is a refractory (high condensation temperature) element with a FIP value nearly identical to that of its semi-volatile neighbor, sulfur. Using a leaky-box galactic propagation model we find that the P/S and Na/Mg ratios in the GCR source favor volatility as the controlling parameter.
|Item Type:||Book Section|
|Additional Information:||© 2001 American Institute of Physics. Issue Date: 21 November 2001. This work was supported by NASA at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, the Goddard Space Flight Center, and Washington University.|
|Group:||Space Radiation Laboratory|
|Subject Keywords:||galactic cosmic rays, cosmic ray composition, element relative abundance, phosphorus, sulphur, solar system, ionisation potential, cosmic ray propagation, modelling|
|Classification Code:||PACS: 98.70.Sa; 98.35.Pr; 96.60.Fs; 95.30.Cq|
|Official Citation:||The phosphorus/sulfur abundance ratio as a test of galactic cosmic-ray source models J. S. George, M. E. Wiedenbeck, W. R. Binns, E. R. Christian, A. C. Cummings, P. L. Hink, R. A. Leske, R. A. Mewaldt, E. C. Stone, T. T. von Rosenvinge, and N. E. Yanasak, AIP Conf. Proc. 598, 263 (2001), DOI:10.1063/1.1434009|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||17 Nov 2011 19:48|
|Last Modified:||26 Dec 2012 14:25|
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