Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267..275a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 1, p. 275-286.
Astronomy and Astrophysics
Astrophysics
6
Data Correlation, Photosphere, Solar Oscillations, Umbras, Sunspots, Time Series Analysis
Scientific paper
We analyze time sequences of spectral lines formed at the photospheric level in order to study the correlation of umbral oscillations with continuum brightness and the influence of the fine structure and evolutionary stage of sunspots. The observations were taken using the Gregory-Coude Telescope (GCT) at the Observatorio del Teide (Tenerife). Power integrated in two frequency bands, 5 minutes (2.5-4.5 mHz) and 3 minutes (5-7 mHz), are used as parameters for this study. Our study yields the following results. A clear correlation exists between the power at the 3 minute band and the umbral brightness in dark cores. The light bridges do not follow this behavior. No correlation is apparent between the 5 minute power and the brightness. The same is obtained after normalization to the power in the adjacent light bridges. There is no correlation between the umbral oscillations of different umbral dark cores. The center-to-limb variation of the power (both bands) seems to support the interpretation of the umbral oscillations as slow body modes. Finally, we discuss the physical context of the observations.
Aballe Villero M. A.
Garcia de La Rosa J. I.
Marco Enric
Vazquez Manuel
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