Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...49..231m&link_type=abstract
Solar Physics, vol. 49, Aug. 1976, p. 231-248. Research supported by the Joint Institute for Laboratory Astrophysics.
Astronomy and Astrophysics
Astrophysics
53
Chromosphere, Magnetoacoustic Waves, Solar Atmosphere, Solar Spectra, Velocity Distribution, Wave Propagation, Calcium, Cross Correlation, Doppler Effect, Fourier Transformation, H Alpha Line, K Lines, Phase Shift, Power Spectra
Scientific paper
Analysis of H-alpha and Ca II K lines in a time sequence of quiet solar spectra is reported. Microphotometric scanning of the spectra is described along with correction for atmospheric effects and Fourier analysis of bright and dark features in the Ca II network. Relations between velocity fields and observed Doppler shifts are examined, and power spectra are plotted for the radial velocities in the observed lines. Coherence, phase shifts, and power-spectrum ratios are discussed with reference to velocity-wave propagation in the chromosphere. Vertical phase velocities are derived for the wavelength ranges from 10 to 15 mHz, 6 to 10 mHz, and 6 to 15 mHz. The results are evaluated in terms of magnetic-field effects, wave reflection from coronal layers, and dissipation mechanisms in the chromosphere. It is concluded that the observations can be accounted for qualitatively by magnetosonic waves traveling upward through layers with a steep Alfven-speed gradient and reflected by the transition zone.
Mein Nicole
Mein Pierre
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