Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...317l..31g&link_type=abstract
Astronomy and Astrophysics, v.317, p.L31-L34
Astronomy and Astrophysics
Astrophysics
6
Sun: Solar Wind, Hydrodynamics, Turbulence, Methods: Numerical
Scientific paper
We study the loss of stability of streams in the region of acceleration of the solar wind. We solve the Euler equations in spherical coordinates with open boundaries. We assume here axisymmetry, temperature conservation during advection, and neglect the magnetic field. We show that any initial velocity modulation vanishes with distance when the inner boundary temperature is uniform, while a persistent stream structure obtains in presence of a temperature modulation at the inner boundary. The stream structure is shown to be unstable in the region where the expansion rate is significantly smaller than the nonlinear time, i.e., below the sonic point. Two observational features are recovered: the correlation between temperature and radial velocity fluctuations (which persists in spite of the turbulence at stream interface), and a trend towards pressure equilibrium (Marsch and Tu, 1993AnGeo..11..659M).
Cavillier E.
Grappin Roland
Leorat Jacques
Prigent G.
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