Oscillatory behaviour in sunspot umbrae

Details Oscillatory behaviour in sunspot umbrae Oscillatory behaviour in sunspot umbrae

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.170..121a&link_type=abstract

(IAU, European Regional Astronomy Meeting, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics and Space Science (ISSN 0004-640

Astronomy and Astrophysics

Astrophysics

2

Solar Oscillations, Solar Spectra, Sunspots, Umbras, Diurnal Variations, Power Spectra, Spectral Resolution

Scientific paper

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.

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