Non-Maxwellian Electron Distributions and Differential Flow Speeds Between Same Element Ions: Effects on Solar Wind Ion Fractions

Details Non-Maxwellian Electron Distributions and Differential Flow Speeds Between Same Element Ions: Effects on Solar Wind Ion Fractions Non-Maxwellian Electron Distributions and Differential Flow Speeds Between Same Element Ions: Effects on Solar Wind Ion Fractions

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh41b20e&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH41B-20

Physics

7509 Corona, 7511 Coronal Holes

Scientific paper

Plasma conditions derived from remote observation of the inner corona predict ion charge states far lower than the ones observed in the in situ solar wind by the SWICS instrument on Ulysses for example. In past calculations of ion charge states it has mostly been assumed that the electrons are Maxwellian distributed, and that ions of the same element flow with the same speed. In that case the electron temperatures in the corona needed to explain the in situ ion charge states, are about twice as high as the ones derived from spectroscopic measurements in the corona. This discrepancy between observed low coronal electron temperatures and high in situ ion charge states, can be solved, if it is assumed that the electron distribution function in the corona deviates from a Maxwellian. The presence of differential flow speeds between ions of the same elements modifies the constraints on the non-Maxwellian part of the electron distribution function. The effect of differential ion flows will be discussed in detail in the paper.

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