Other
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286..269w&link_type=abstract
In ESA, Seismology of the Sun and Sun-Like Stars p 269-272 (SEE N89-25819 19-92)
Other
2
Solar Activity Effects, Solar Magnetic Field, Solar Oscillations, Sunspots, Doppler Effect, Helioseismology, Magnetohydrodynamic Waves, Solar Flux
Scientific paper
Oscillatory Doppler shifts in sunspots and in small fluxtubes are observed using either the intensity profile of lines with negligible magnetic splitting or the circular Zeeman profile (Stokes-V inversion point) of lines with strong Zeeman splitting. Sunspot umbrae show local 5 min oscillations of reduced amplitude as compared to the neighboring photosphere. Occasionally 5 min oscillations of opposite phase at both outer penubral borders are found. This could be interpreted as tilting and bobbing of the spot as a whole on the oscillating solar surface. In contrast to these larger scale sunspot fluxtubes the gas in the small fluxtubes of a few hundred km diameter seems to fully participate in the photospheric oscillations without any interaction with the magnetic field. Prominence magnetic fields show sometimes a reaction to the photospheric 5 min and to the chromospheric 3 min oscillations; in addition several other periods are found. Indications for eigenmodes of Alfven waves are found.
Balthasar Horst
Stellmacher Goetz
Wiehr Eberhard
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