Alfven wave dissipation in the solar wind

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Landau Damping, Magnetohydrodynamic Turbulence, Magnetohydrodynamic Waves, Solar Wind, Wave Attenuation, Plasma Frequencies, Power Spectra, Radial Distribution, Solar Magnetic Field

Scientific paper

The authors propose linear Landau damping on oblique Alfvén waves as a significant dissipation mechanism acting on Alfvénic turbulence during propagation in the solar wind. A corresponding calculation of the evolution of the turbulent spectrum is shown to indeed reproduce the main features of the HELIOS observations of magnetic turbulence. In particular, the characteristic behaviour of dissipation length versus frequency derived from the data is well reproduced.

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