Other
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001kfnt...17..249o&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, vol. 17, no. 3, p. 249-260
Other
Scientific paper
The complex coefficients of reflection and transmission of stationary acoustic waves are calculated for different heights in the MACKKL model of the solar atmosphere for the approximation of an isothermal solar atmosphere stratified by gravitation. The amplitude and phase of the reflected and transmitted waves are shown to behave anomalously along the acoustic cut-off frequency line in the height-frequency diagram, and a reflection phase jumps was found at the temperature minimum height. Simulations of the primary upward velocity wave and the superposition fields of downward velocities of the waves reflected and scattered at different heights are carried out. As a rule, these fields show negative phases typical of primary upward velocity waves. The height of the phase jump generated at the temperature minimum diminishes with frequency after the superposition and turns out to be from 200 to 400 km. The amplitudes of second-order reflected waves are often bigger than the first-order ones. The scattered waves and high-order reflections make impossible phase jump observations. Reflections of different orders are considered. The multiply reflected waves experience a minimal damping in the range of 5-minute oscillations with extrema at 2.9 mHz, 3.6 mHz, and 4.9 mHz.
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