Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...95...37s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 95, Jan. 1985, p. 37-44.
Astronomy and Astrophysics
Astronomy
14
Solar Oscillations, Sunspots, Ultraviolet Astronomy, Umbras, Chromosphere, Inhomogeneity, Line Spectra, Resonance
Scientific paper
The theory of a resonator for slow magneto-atmospheric waves in the chromosphere of a sunspot umbra has been used to check different models of the structure of the chromosphere and transition region. Oscillations of velocity and intensity in C IV, Si IV, and O IV lines observed by Gurman et al. (1982) on the SMM spacecraft have been compared with the calculated oscillations. The observed spectrum of resonant peaks could well be explained by a gradient model of the umbral chromosphere. Different assumptions concerning the structure of the transition region do not influence the calculated resonance periods, but the amplitudes and phases of oscillations are modified. There is strong evidence for a concentration of the observed oscillations in cold fine structure elements of the transition region, even if the filling factor of such elements is very small (some few percent). Isothermal rather than adiabatic oscillations in the cold elements should be assumed in order to explain the observed fluctuations of line intensity; the relative amplitudes of pressure oscillations in the hot main component with a steep gradient of temperature are to small to explain the observed intensity fluctuations.
Locans V.
Staude Jakob
Zhugzhda Iu. D.
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