Solar atmospheric dynamics. II - Nonlinear models of the photospheric and chromospheric oscillations

Details Solar atmospheric dynamics. II - Nonlinear models of the photospheric and chromospheric oscillations Solar atmospheric dynamics. II - Nonlinear models of the photospheric and chromospheric oscillations

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258..393l&link_type=abstract

Astrophysical Journal, Part 1, vol. 258, July 1, 1982, p. 393-403. Research supported by the Lockheed Independent Research Fund

Computer Science

Sound

45

Chromosphere, Photosphere, Solar Atmosphere, Solar Oscillations, Stellar Models, Astrodynamics, Atmospheric Temperature, Gas Ionization, Hydrodynamics, Kinetic Energy, Power Spectra, Solar Flux Density, Sound Waves

Scientific paper

The one-dimensional, nonlinear dynamics of the solar atmosphere is investigated, and models of the observed photospheric (300 s) and chromospheric (200 s) oscillations are described. These are resonances of acoustic wave cavities formed by the variation of the temperature and ionization between the subphotospheric, hydrogen convection zone and the chromosphere-corona transition region. The dependence of the oscillations upon the excitation and boundary conditions leads to the conclusion that for the observed amplitudes, the modes are independently excited and, as trapped modes, transport little if any mechanical flux. In the upper photosphere and lower chromosphere, where the two modes have comparable energy density, interference between them leads to apparent vertical phase delays which might be interpreted as evidence of an energy flux.

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