THE EFFECT OF MAGNETO-SONIC WAVES ON A ZEEMAN TRIPLET WITH APPLICATION TO SUNSPOTS.
OSLO UNIV (NORWAY) INST OF THEORETICAL ASTROPHYSICS
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The effect of longitudinal compression waves on stellar spectral lines has been discussed recently by Eriksen and Maltby. When integrated over a wavelength of the compression wave, the line-absorption coefficient will be asymmetrical. Maltby and Eriksen have suggested that the Evershed effect in sunspots may be interpreted as an acoustical wave phenomenon. They showed that asymmetrical line profiles similar to those observed in sunspot penumbrae may be produced by either progressive sound waves propagating along the magnetic lines of force or by longitudinal compression waves propagating perpendicular to the magnetic field. The wave hypothesis may be tested observationally if sufficient time and spatial resolution is obtained. This report describes an observational test.