Fast Solar Wind Acceleration by Nonlinear Waves in Coronal Holes

Details Fast Solar Wind Acceleration by Nonlinear Waves in Coronal Holes Fast Solar Wind Acceleration by Nonlinear Waves in Coronal Holes

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.7414o&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #74.14; Bulletin of the American Astronomical Society, Vol. 29, p.1326

Astronomy and Astrophysics

Astronomy

Scientific paper

We use the 2.5D (3D with azimuthal symmetry) MHD equations to model numerically the solar wind acceleration in a nonhomogeneous coronal hole. We investigate the parametric dependence of the solar wind acceleration by nonlinear MHD waves with a monochromatic and a broad band driving source. We find that when the Alfven wave amplitude is above a parameter dependent threshold , large amplitude nonlinear longitudinal waves are generated and contribute to the radial acceleration. The calculated solar wind speed and density fluctuates considerably on a time scale of tens of minutes with an amplitude of up to several hundred km/s near the sun (4R_sun

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