Helioseismology

Details Helioseismology Helioseismology

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985sciam.253...48l&link_type=abstract

Scientific American (ISSN 0036-8733), vol. 253, Sept. 1985, p. 48-57.

Computer Science

Sound

23

Helioseismology, Photosphere, Solar Physics, Stellar Structure, Sun, Abundance, Doppler Effect, Power Spectra, Radial Velocity, Reflection, Refraction, Solar Interior, Sound Waves, Stellar Oscillations

Scientific paper

Oscillations of the sun's surface are due to sound waves resonating in the solar interior. In actual observations, such surface displacements are evidenced in the form of Doppler shifts in the wavelengths of light that are absorbed by the moving gases, and as variations in brightness. The spatial pattern and period of surface oscillation allows investigators to deduce the three-dimensional structure of the resonance, and to infer properties of the solar interior. Reflection and refraction below the solar surface confine sound waves within acoustic cavities. Such trapped waves interfere constructively with themselves as they circle the sun, creating the resonances that are detectable as solar surface oscillations.

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