Visibility of solar p-modes

Details Visibility of solar p-modes Visibility of solar p-modes

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..309t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 1, p. 309-318.

Computer Science

Sound

25

Illuminance, Photosphere, Solar Activity, Solar Radiation, Perturbation, Radiative Transfer, Sound Waves, Vibration Mode

Scientific paper

Visibility functions of low-degree nonradial oscillations are derived here for solar irradiance measurements in the visible continuum. Corrections due to opacity variations in the photosphere are taken into account and this both in adiabatic and nonadiabatic cases. The computations show that opacity effects are not negligible and substantially attenuate the emergent intensity. Likewise the nonadiabatic effects have a large influence on the flux perturbations and should be allowed for. Using the observed fluxes from the IPHIR experiment the theoretical visibility functions provide the p-mode energies. The best agreement with observations is obtained in two different cases: isothermal oscillation corresponding to very short relaxation times in the photosphere, or blackbody approximation (i.e. negligible opacity variations).

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