High-speed solar wind from Ulysses measurements and comparison with exospheric models

Physics

Scientific paper

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Solar Wind Plasma, Sources Of Solar Wind

Scientific paper

We outline the main results obtained in situ by thermal noise spectroscopy on Ulysses at high latitudes. The Ulysses trajectory allows for the first time to obtain a data sample of the steady-state fast solar wind, which is free of bias due to the presence of interaction regions and to data selection between different types of winds. This enables us to derive in particular the core electron temperature radial profile. Besides, we present a kinetic collisionless model of the solar wind which predicts the electron temperature profile and the terminal velocity. We give analytical expressions at large distances, which can explain the trends of the temperature profiles obtained by previous studies.

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