Umbral oscillations in sunspots

Details Umbral oscillations in sunspots Umbral oscillations in sunspots

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135..188t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 1, June 1984, p. 188, 189.

Astronomy and Astrophysics

Astrophysics

22

Solar Oscillations, Sunspots, Umbras, Chromosphere, Resonance

Scientific paper

Contrary to the claim by von Uexküll et al. (1983), their observations of upward phase propagation of umbral oscillations in the chromosphere are in agreement with the photospheric resonance theory of Thomas and Scheuer (1982) and in contradiction to the chromospheric resonance theory of Zhugzhda et al. (1983). Other observational evidence also indicates that the fundamental 3-min umbral oscillation is due to a photospheric resonance, although the closely-spaced multiple peaks sometimes seen in the power spectrum of chromospheric oscillations may well be due to chromospheric resonances.

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