Speed of sound in the solar interior

  title={Speed of sound in the solar interior},
  author={J. Christensen-Dalsgaard and T. Duvall and D. Gough and J. Harvey and E. Rhodes},
Frequencies of solar 5-min oscillations can be used to determine directly the sound speed of the solar interior. The determination described here does not depend on a solar model, but relies only on a simple asymptotic description of the oscillations in terms of trapped acoustic waves. 
Properties of Solar Oscillations
Many of the oscillations that can be observed in the atmosphere of the Sun are resonant acoustic or gravity modes of the interior. Accurate measurement of the frequencies of these p and g modesExpand
Inverse problem of solar oscillations
We present some preliminary results of numerical simulation to infer the sound velocity distribution in the solar interior from the oscillation data of the Sun as the inverse problem. We analyze theExpand
Solar oscillation frequencies and the equation of state
Observed oscillation frequencies of the Sun can be used to investigate the properties of matter under conditions that cannot be achieved on Earth. In particular the frequencies are sensitive to theExpand
Asymptotic Sound-Speed Inversions
An asymptotic analysis of stellar p modes in the short-wavelength limit is summarized. The formula can be used as a means of estimating the sound speed in the solar interior from a knowledge ofExpand
The Influence of Convection Theory Uncertainties on the Deduction of the Speed of Sound in the Solar Interior
Two models differing only in the surface layers are studied to determine how the derived frequencies are changed, These frequency changes can only be partially treated as being caused by a surfaceExpand
Observations of Solar Oscillations
Recent progress in the field of Helioseismology is reviewed. New results from observations of the Global p-Mode spectrum and some of their theoretical implications are considered as well asExpand
Helioseismic Investigation of Solar Internal Structure
The solar oscillation frequencies provide our only means of obtaining detailed information about conditions inside the Sun. Here I give a brief overview of the relevant properties of solar models andExpand
Sensitivity of Solar P-Modes To Solar Envelope Structure
We present a study of the effects of diffusion of helium and heavy elements from the convection zone into the radiative layer immediately below the convection zone, on the structure of the solarExpand
Global resonances in the evolution of solar magnetic fields
Decomposition of the pattern of solar magnetic fields in spherical harmonics for a data set of 25 years and power spectrum analysis of the harmonic coefficients reveals a strikingly resonant modalExpand
Simple Seismic Tests of the Solar Core
A model-independent reconstruction of mechanical profiles (density, pressure) of the solar interior is outlined using the adiabatic sound speed and buoyancy frequency profiles. These can be inferredExpand


Observations of solar oscillations of low and intermediate degree
Measurements are presented of solar velocity oscillations with spherical harmonic degree 1–139 and angular order ∼0. With an amplitude sensitivity of ∼2 cm s −1, trapped acoustic wave modes of radialExpand
Sensitivity of five minute eigenfrequencies to the structure of the sun
The dependence of theoretical eigenfrequencies of five minute oscillation modes on the parameters that determine model solar envelopes has been investigated. It was found that the p mode frequenciesExpand
A dispersion law for solar oscillations
The pressure or p-modes are acoustic vibrations trapped in a resonant cavity below the solar surface. The waves are most easily observed as primarily vertical velocities at the solar surface byExpand
Our First Inferences from Helioseismology
Seismic disturbances on the sun must surely contain a wealth of information about the solar interior. We believe that because there is a strong similarity to the seismology of the earth.
Testing solar models with global solar oscillations in the 5-minute band
We have computed frequencies of solar oscillation for normal modes described by spherical harmonics Y/sup m//sub l/(theta,phi) with values of l between 0 and 4. The frequencies for the standard solarExpand
On the rotation of the Sun
  • D. Gough
  • Physics
  • Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
  • 1984
An asymptotic method is developed to estimate the rotational splitting of sectoral five-minute solar oscillations. Integral formulae are obtained which can be inverted to yield the variation withExpand
The influence of partial ionization and scattering states on the solar interior structure
The equation of state for the solar interior is normally assumed to be a fully ionized gas corrected by the Debye-Hueckel Coulomb interaction, partial degeneracy, and radiation pressure. TheExpand
Nonradial Oscillations of Stars
This book deals primarily with the linear theory of nonradial oscillations of spherically symmetric stars. Emphasis is placed on observational aspects of nonradial oscillations, nonradialExpand