On the Energy Dependence of Ionic Charge States

Details On the Energy Dependence of Ionic Charge States On the Energy Dependence of Ionic Charge States

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3277k&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

4

Scientific paper

In this study we evaluate the effect of power-law spectra with rigidity dependent exponential cut-off, as often observed, on the mean ionic charge of Fe. We show that power law spectra with an exponential cut-off, with e-folding energy E0 (M/Q) ˜ (Q/M)α , α ≈ 1, and E0 ≤ 0.4 MeV/n (for 56 Fe10+ ), result in a moderate increase of the mean ionic charge of Fe by 1 2 charge units in the energy range of 0.1-1 MeV/n. We use the spectral information for oxygen and iron from the ULEIS experiment onboard ACE at energies of ≈ 0.11-3.6 MeV/n to compare the energy depence of the mean ionic charge of iron as expected from the M/Q dependent cut-off effect with the mean ionic charge measured with SEPICA onboard ACE.

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