Extreme-ultraviolet diagnostics of pick-up ions in regions close to the solar corona. I. Feasibility of new observations

Details Extreme-ultraviolet diagnostics of pick-up ions in regions close to the solar corona. I. Feasibility of new observations Extreme-ultraviolet diagnostics of pick-up ions in regions close to the solar corona. I. Feasibility of new observations

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...335..724f&link_type=abstract

Astronomy and Astrophysics, v.335, p.724-732 (1998)

Astronomy and Astrophysics

Astrophysics

2

Plasmas, Methods: Observational, Sun: Corona, Sun: Uv Radiation, Interplanetary Medium

Scientific paper

Recent investigations of pick-up ion data obtained with the AMPTE and the Ulysses spacecraft resulted in the discovery that, in contrast to previous expectation, pick-up ion velocity distribution can be anisotropic. Such anisotropy results from a smaller efficiency of pitch-angle scattering than usually assumed and translates into a larger scattering mean free paths than previously attributed to these particles. We demonstrate that existing and upcoming in-situ observations can be substantially supplemented by Earthbound observations of the extreme-ultraviolet resonance glow of pick-up ions in the vicinity of the sun. The proposed observations, in combination with a theory of ions being picked-up by the heliospheric magnetic field close to the sun will not only allow us to obtain information about the anisotropy of the pick-up ion velocity distributions, but also to deepen our understanding of the physics of the accelerated solar wind and of the pick-up process of ions in this innermost region of the heliosphere not yet well explored.

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