Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....57..211c&link_type=abstract
Astronomy and Astrophysics, vol. 57, no. 1-2, May 1977, p. 211-220. USAF-supported research.
Astronomy and Astrophysics
Astrophysics
26
Chromosphere, High Resolution, Line Spectra, Stellar Spectra, Calcium, H Alpha Line, Iron, K Lines, Oscillations, Solar Granulation
Scientific paper
Time sequence spectroscopic observations of the quiet solar chromosphere along a 200 Mm strip near the center of the disk were reduced to obtain 30 min of data. Oscillations appear in most of the observations in selected photospheric and chromospheric lines, but rarely in continuum observations. At a given point, the oscillations may be prominent or weak, they are never regular in time, and there is no unique relationship between the amplitudes at different heights. There are several examples of granules which apparently excite a burst of short period oscillations. By considering the line shift and intensity variations of all the lines, a working model is derived for the velocity field and related temperature variation.
Beckers Jacques M.
Brown David R.
Cram Lawrence E.
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