Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...119..124k&link_type=abstract
Astronomy and Astrophysics, vol. 119, no. 1, Mar. 1983, p. 124-130.
Astronomy and Astrophysics
Astrophysics
22
Brightness Distribution, Chromosphere, H Alpha Line, K Lines, Solar Atmosphere, Solar Oscillations, Astronomical Photography, Calcium, Data Processing, Filtergrams, Magnetohydrodynamic Waves, Solar Spectra, Spectral Energy Distribution, Spectrum Analysis, Stellar Spectrophotometry
Scientific paper
The authors have performed a power analysis of time sequences of photographic K and Hα filtergrams from disc center of the sun. The results are: In the k-ω-diagram from the Ca II K filtergrams, the modal structure of the 5-min-oscillation is clearly seen. The 5-min modes are difficult to detect in the k-ω-diagrams from the Hα sequences. In both lines, K and Hα, the authors observe ridges in the k-ω-diagrams running parallel to the kh-axis. Their periods correspond to the chromospheric 3-min-oscillation. But power appears also, in discrete ridges, at shorter periods P = 60 s...150 s, where the lower limit is given by the Nyquist frequency of the observations. After subtraction of the time averaged intensity at each position in the filtergrams, the rms fluctuations are 3.5% in K and 4.0% in Hα.
Kneer Franz
von Uexkuell M.
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