Oscillations and the temperature minimum in sunspot umbrae

Details Oscillations and the temperature minimum in sunspot umbrae Oscillations and the temperature minimum in sunspot umbrae

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...204..263l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 204, no. 1-2, Oct. 1988, p. 263-265.

Astronomy and Astrophysics

Astrophysics

5

Solar Atmosphere, Solar Oscillations, Solar Temperature, Sunspots, Umbras, Atmospheric Models, Electromagnetic Spectra, Light Scattering, Longitudinal Waves, Spectral Bands

Scientific paper

Observed umbral oscillation with periods of 2 - 3 min can be explained by slow-mode longitudinal magnetoatmospheric waves which are partly trapped in the umbral photosphere and chromosphere. Detailed numerical calculations for such a resonator in semi-empirical model atmospheres predict details of umbral oscillations which, after comparison with observed data, provide new information on the atmospheric structure. The results support arguments in favour of a low value of the temperature minimum (≤3000K) in the dark parts of umbrae, while the oscillations are deteriorated in bright umbral structures such as dots or light bridges.

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