Observational aspects of sunspot oscillations

Details Observational aspects of sunspot oscillations Observational aspects of sunspot oscillations

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.220..207l&link_type=abstract

In ESA The Hydromagnetics of the Sun p 207-209 (SEE N85-25091 14-92)

Physics

Solar Magnetic Field, Solar Oscillations, Sunspots, Chromosphere, Penumbras, Photosphere, Spatial Distribution, Umbras

Scientific paper

Observations of sunspot umbral oscillations in Ca II H and He I 10830 A are presented. They show that they have high amplitude in the upper chromosphere. The umbral oscillations have several cospatial frequency modes. The amplitude of the umbral 3 min chromospheric oscillation is not correlated with the amplitude of the 5 min oscillations in the umbral photosphere. The spatial distribution of amplitudes of photospheric and chromospheric oscillations may reveal the geometry of the penumbral magnetic field.

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