The Abundance of Iron Isotopes in the Solar Wind: Results From SOHO/CELIAS/MTOF

Authors: F.M. Ipavich, J.A. Paquette, P. Bochsler, S.E. Lasley, P. Wurz, H. Grunwaldt, M. Hilchenbach, G. Gloeckler, J. Geiss, and D. Hovestadt
Reference: Spring AGU Conference 2000

Abstract: The MTOF sensor uses time of flight measurements in a harmonic potential region to identify elements and isotopes in the solar wind with excellent mass resolution. The combination of MTOF's large bandwidth electrostatic deflection system and the 3-axis stabilized orientation of SOHO results in excellent counting statistics. We report relative abundances of the Iron isotopes with mass 54, 56 and 57. Since these isotopes are chemically identical, we expect essentially no fractionation either in the solar wind or in the instrument, resulting in relatively small estimated uncertainties. We compare our results obtained in different solar wind flow types with those derived from meteoritic measurements.

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Last Update: April 2, 1999, James Weygand