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Title:
The chromosphere above sunspot umbrae. III - Spatial and temporal variations of chromospheric lines
Authors:
Kneer, F.; Mattig, W.; v. Uexkuell, M.
Affiliation:
AA(Kiepenheuer-Institut für Sonnenphysik, Freiburg im Breisgau, Germany), AB(Kiepenheuer-Institut für Sonnenphysik, Freiburg im Breisgau, Germany), AC(Kiepenheuer-Institut für Sonnenphysik, Freiburg im Breisgau, Germany)
Publication:
Astronomy and Astrophysics, vol. 102, no. 2, Oct. 1981, p. 147-155. Deutsche Forschungsgemeinschaft (A&A Homepage)
Publication Date:
10/1981
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Chromosphere, Solar Spectra, Spatial Distribution, Spectral Line Width, Sunspots, Temporal Distribution, Astronomical Photography, Calcium, H Lines, K Lines, Solar Atmosphere, Spectral Energy Distribution, Umbras
Bibliographic Code:
1981A&A...102..147K

Abstract

The lines Ca II H, K, 8542 A, Na I D(1) and D(2), Ni I 5893 A, and H-alpha, were analyzed in photographic spectrograms obtained from a sunspot. The following results are found for the umbra: (1) the H and K lines are highly correlated, with an emission cores maximum-intensities ratio of 1.2; (2) the K intensities are poorly correlated with those of 8542, D(2), and H-alpha; this behavior is attributed to atmospheric structure horizontal fluctuations having little correlations between those in high and low layers, (3) the periodic temporal fluctuations of the K emission core with umbral flashes are identified, and found to occur throughout the umbral area covered by the spectrograph slit; and (4) fluctuations in the photospheric Ni I 5893 A line cannot be matched to the chromospheric fluctuations, in accord with Giovanelli (1978).

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