Helium ion acceleration and heating by Alfvén/cyclotron fluctuations in the solar wind

Details Helium ion acceleration and heating by Alfvén/cyclotron fluctuations in the solar wind Helium ion acceleration and heating by Alfvén/cyclotron fluctuations in the solar wind

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10624955g&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A11, p. 24955-24964

Astronomy and Astrophysics

Astrophysics

23

Solar Physics, Astrophysics, And Astronomy

Scientific paper

The interaction between alpha particles and a given magnetic power spectrum of Alfvén/cyclotron fluctuations at propagation parallel to the background magnetic field B0 is examined in a model of a homogeneous, collisionless, magnetized plasma. Exact solutions of the linear Vlasov dispersion equation and second-order theory are used to calculate the wave-particle scattering rates for alpha/proton momentum exchange as well as for proton and alpha heating and anisotropy change. It is well established that alpha velocities are not observed to oscillate when the alpha/proton relative flow speed parallel to B0 matches the phase speed of long-wavelength Alfvén waves, the ``surfing'' speed. Second-order theory predicts that wave-particle scattering is dominated by the relatively short wavelength, relatively low phase speed Alfvén/cyclotron fluctuations which have a strong cyclotron resonance with the alphas. Thus the theory predicts that at sufficiently high proton β the average alpha/proton speed should be observed to be substantially smaller than the surfing speed associated with long-wavelength fluctuations.

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