𝔖 Bobbio Scriptorium
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The evershed effect as a wave phenomenon

✍ Scribed by P. Maltby; G. Eriksen

Book ID
104641964
Publisher
Springer
Year
1967
Tongue
English
Weight
449 KB
Volume
2
Category
Article
ISSN
0038-0938

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✦ Synopsis

It is suggested that longitudinal compression waves are propagating parallel to the solar surface from the umbra towards the photosphere. It is shown that the line-absorption coefficient is asymmetrical, when integrated over a wavelength of the compression wave. The effect of the waves on the line profile is discussed, and it is shown that asymmetrical line profiles of the type observed in sunspot penumbrae will be produced.

With the Evershed effect interpreted as an acoustical wave phenomenon the propagation (of the waves) may also be perpendicular to the magnetic lines of force, whereas material motion is likely to be restricted to the direction along the lines of force.

πŸ“œ SIMILAR VOLUMES

The umbral flash as a magneto-acoustic w
The umbral flash as a magneto-acoustic wave phenomenon
✍ Ove Havnes πŸ“‚ Article πŸ“… 1970 πŸ› Springer 🌐 English βš– 388 KB

The suggestion that an 'umbra flash' may be caused by a magneto-acoustic wave phenomenon is examined. It is suggested that the flash in Call lines is formed during the compressional stage in a magneto-acoustic wave. The compression which is assumed to be adiabatic will produce a rise in temperature