The Evershed effect: rise and fall of the wave model.

Details The Evershed effect: rise and fall of the wave model. The Evershed effect: rise and fall of the wave model.

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...297..861b&link_type=abstract

Astronomy and Astrophysics, v.297, p.861

Astronomy and Astrophysics

Astrophysics

5

Sunspots, Mhd, Radiative Transfer, Line: Profiles

Scientific paper

Adiabatic surface and trapped body waves have recently been proposed as the source of the Evershed effect. We show that such waves fail to simultaneously reproduce the main features of the Evershed effect in a set of spectral lines with different temperature sensitivities. This result sets constraints on all models that attempt to explain the Evershed effect on the basis of a wave-like correlation between temperature and velocity. In the photospheric layers in which the waves are expected to propagate, dissipative effects due to radiative diffusion are likely to damp the wave-induced temperature perturbations. We show, however, that in the line forming penumbral layers radiatively damped ("isothermal") waves shift spectral lines of neutral and ionized species in opposite directions. We conclude that, in spite of a number of highly attractive features, linear wave models have great difficulty in explaining the Evershed effect.

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