Signatures of wave-ion interactions in the solar wind: Ulysses observations

Details Signatures of wave-ion interactions in the solar wind: Ulysses observations Signatures of wave-ion interactions in the solar wind: Ulysses observations

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1169g&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A8, pp. SSH 4-1, CiteID 1169, DOI 10.1029/2001JA000269

Physics

Plasma Physics

8

Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Plasma Waves And Turbulence, Space Plasma Physics: Wave/Particle Interactions

Scientific paper

Theory and simulations predict that resonant wave-particle scattering by enhanced magnetic fluctuations yields characteristic signatures in properties of solar wind ions. Here Ulysses/Solar Wind Observations Over the Poles of the Sun (SWOOPS) instrument measurements of protons and alpha particles are examined to seek three types of these signatures: (1) a statistical constraint on the proton temperature anisotropy imposed by the electromagnetic proton cyclotron instability; (2) a correlation between the alpha anisotropy and the alpha/proton relative flow speed driven by electromagnetic alpha/proton instabilities; and (3) relationships among the proton anisotropy, the alpha anisotropy, and the alpha/proton speed induced by the cascade of long-wavelength Alfvén fluctuations to ion cyclotron resonances at shorter wavelengths. No signatures of alpha/proton instabilities are found. However, the first example of the proton anisotropy constraint in the slow solar wind is demonstrated, and a theoretical prediction for Alfvén/cyclotron wave acceleration in the fast wind is similar to a statistical lower bound observed on the alpha/proton speed.

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