On the Fitting of Ion-Ion Drifting Plasma

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Plasma Drift Waves, Solar Wind, Ion Beams, Magnetohydrodynamics And Plasmas, Drift Waves, Solar Wind Plasma, Sources Of Solar Wind, Mathematical Procedures And Computer Techniques

Scientific paper

It has been known for almost three decades that the solar wind proton population can often be represented as a sum of two proton distribution components of nearly equal temperatures with the diluted component streaming relative to the denser component. The differential streaming speed is often near the local Alfvén speed. The usual way for deriving such important quantities as a mean speed of individual proton distributions and its characteristic thermal temperature is based on separation of observed distribution into two parts and fitting them independently with a given well-defined distribution function. As we will show below this kind of analysis can be misleading when the thermal spread of the particle distributions is wide enough to make these distributions overlap. In the summary, we argue where this kind of analysis can be important.

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