Oscillatory behaviour in sunspot umbrae

Bibcode
1990Ap&SS.170..121A
DOI
10.1007/BF00652657
Aballe Villero, M. A.; Garcia de La Rosa, J. I.; Vazquez, M.; Marco, E.
Bibliographical reference

(IAU, European Regional Astronomy Meeting, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics and Space Science (ISSN 0004-640X), vol. 170, no. 1-2, Aug. 1990, p. 121-126. Research supported by CICYT.

Advertised on:
8
1990
Number of authors
4
IAC number of authors
0
Citations
4
Refereed citations
4
Description
A set of series of spectra of high spectral resolution corresponding to the same umbra on several days, is used to study the oscillations related to evolution of the two main dark cores of it. Differences in the behavior of each core and an evolution in the power spectra not related with the external appearance of the spot are detected. A quite constant value of the ratio of power at five minutes over three minutes has been found.
Type
Non-refereed
Solar oscillations
Sunspots

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