The chromosphere above sunspot umbrae. III - Spatial and temporal variations of chromospheric lines

Details The chromosphere above sunspot umbrae. III - Spatial and temporal variations of chromospheric lines The chromosphere above sunspot umbrae. III - Spatial and temporal variations of chromospheric lines

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...102..147k&link_type=abstract

Astronomy and Astrophysics, vol. 102, no. 2, Oct. 1981, p. 147-155. Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astrophysics

37

Chromosphere, Solar Spectra, Spatial Distribution, Spectral Line Width, Sunspots, Temporal Distribution, Astronomical Photography, Calcium, H Lines, K Lines, Solar Atmosphere, Spectral Energy Distribution, Umbras

Scientific paper

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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