Computer Science – Sound
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...44..275h&link_type=abstract
Solar Physics, vol. 44, Oct. 1975, p. 275-292.
Computer Science
Sound
21
Calcium, Chromosphere, H Lines, K Lines, Solar Spectra, Asymmetry, Infrared Spectra, Propagation Velocity, Pulsed Radiation, Sound Waves
Scientific paper
A theoretical study is made of the influence of propagating acoustic pulses in the solar chromosphere on the line profiles of the Ca II resonance and infrared triplet lines. The major objective is to explain the observed asymmetries seen in the cores of the H and K lines and to predict the temporal behavior of the infrared lines caused by passing acoustic or shock pulses. The velocities in the pulses, calculated from weak-shock theory, are consistently included in the non-LTE calculations. The results show that these lines are very sensitive to perturbations in the background atmosphere caused by the pulses. Only minor changes in the line shapes result from including the velocities consistently in the line source-function calculations. The qualitative changes in the line profiles vary markedly with the strength of the shock pulses. The observed differences in the K line profiles seen on the quiet sun can be explained in terms of a spectrum of pulses with different wavelengths and initial amplitudes in the photosphere.
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