Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315..303s&link_type=abstract
Astronomy and Astrophysics, v.315, p.303-311
Astronomy and Astrophysics
Astrophysics
13
Sun: Chromosphere, Sun: Oscillations, Sun: Infrared, Sunspots, Sun: Faculae, Plages
Scientific paper
The cold heart of the solar chromosphere is best investigated using fundamental band lines of carbon monoxide, CO, at 4.7μm. We have obtained time series of CO spectra in the quiet sun and in active-region plage at the solar limb and at disk centre. In addition, we have recorded time series in sunspot umbrae located near disk centre. The power spectra and RMS amplitudes of the quiet-sun oscillations at disk centre and at the limb are not compatible with a generally hot chromosphere which is periodically cooled, but support recent suggestions that the low chromosphere is pervasively cool, interspersed with hot, possibly shocked material. In the plage the CO oscillations provide indirect evidence for the expansion of hot material (probably inside magnetic elements) with height. In umbrae the CO lines exhibit well-separated 3min and 5min peaks. We also present spectra of the phase shift between velocity and intensity oscillations of CO lines. At disk centre in the quiet sun the phase shift is on the whole similar to that seen in atomic lines formed near the classical temperature minimum, although with some properties peculiar to CO. In plages the quality of the phase shift is marginal, but suggests either large radiative damping or propagating waves in the 4 mHz frequency range. Finally, in sunspots the phase shift resembles that of atomic chromospheric lines in some umbrae.
Livingston Willam
Muglach Karin
Solanki Sami K.
Wallace Laura
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