Wave reflections in the solar atmosphere

Details Wave reflections in the solar atmosphere Wave reflections in the solar atmosphere

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...64...43p&link_type=abstract

Solar Physics, vol. 64, Nov. 1979, p. 43-56.

Physics

12

Acoustic Propagation, Atmospheric Models, Chromosphere, Solar Atmosphere, Solar Corona, Wave Reflection, Atmospheric Stratification, Magnetoacoustic Waves, Stellar Models, Weighting Functions

Scientific paper

The small phase-lag between velocities observed at different chromospheric levels is interpreted as being due to acoustic waves reflected by the very hot atmospheric layers of the chromosphere-corona transition zone. Consideration is first given to an isothermal slab, then a realistic solar atmospheric model and weighting functions for velocities in Ca II lines are calculated. It is shown that taking into account these functions and integrating over horizontal wave numbers leads to a good agreement with previous observations (Mein, 1977) in the case of 8498 and 8542 Ca II lines. For the K line, the less good agreement shows that magnetoacoustic waves become important in the upper chromospheric layers.

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