Proton/alpha magnetosonic instability in the fast solar wind

Details Proton/alpha magnetosonic instability in the fast solar wind Proton/alpha magnetosonic instability in the fast solar wind

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...105.7483l&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue A4, p. 7483-7490

Astronomy and Astrophysics

Astrophysics

21

Solar Physics, Astrophysics, And Astronomy

Scientific paper

A proton/alpha magnetosonic instability is investigated in the framework of the linear theory of plasma waves for conditions typical of the fast solar wind. Warm streaming alpha particles with a differential speed, the speed relative to the major ions/protons, vα, close to the Alfvén speed, are found to significantly enhance a magnetosonic instability when their temperature anisotropy Γi=Ti⊥/Ti∥ is less than 1. Here Ti∥ and Ti⊥ denote the velocity distribution parallel and perpendicular to the magnetic field. The possible role of the instability in limiting the relative speed between alpha particles and protons in the fast solar wind is discussed.

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