Parametric decay of circularly polarized Alfvén waves in the radially expanding solar wind

Details Parametric decay of circularly polarized Alfvén waves in the radially expanding solar wind Parametric decay of circularly polarized Alfvén waves in the radially expanding solar wind

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11210110t&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue A10, CiteID A10110

Physics

1

Interplanetary Physics: Mhd Waves And Turbulence (2752, 6050, 7836), Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Plasma Waves And Turbulence, Space Weather: Models

Scientific paper

We present a magnetohydrodynamic (MHD) simulation study of the parametric decay of the circularly polarized Alfvén waves propagating in the radial outflow of the solar wind. Assuming the transonic wind solution as an initial condition, we continuously injected monochromatic circularly polarized Alfvén waves from the inner boundary at the lower corona, and simulated the wave propagation. The injected Alfvén waves are subject to the parametric decay, and density fluctuations in the solar wind plasma grow rapidly at a specific region. The location of the most unstable region depends on the amplitude and frequency of injected Alfvén waves. We found that the unstable region of simulation results can be well estimated by considering a localized dispersion relation in the frame of reference moving with the background solar wind.

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