Problems of Solar and Stellar Oscillations: Proceedings of the 66th IAU Colloquium Held at the Crimean Astrophysical Observatory, U. S. S. R. , 1-5 September 1981

D. O. GOUGH Institute of Astronomy. Madingley Road. Cambridge. U. K. IAU Colloquium 66 on 'Problems of Solar and Stellar Oscillations' was held at the Crimean Astrophysical Observatory, U. S. S. R. , on 1-5 September, 1981. The principal purpose of the colloquium was to study the low-amplitude oscillations of the Sun and, to a lesser extent, to consider similar oscillations of other stars. Much of the emphasis of the discussions was on the diagnostic value of the oscilla­ tions. In the last few years we have become aware that the frequencies of the five-minute modes of high degree, which constitute the major component of the oscillations discovered twenty years ago by Evans and Michaud, can be used to put quite tight bounds on the stratification of the solar convection zone. These permit a calibration of solar models computed from so-called standard evolution theory. Modes of low degree penetrate beneath the convection zone to the core of the Sun, and can in principle test the evolution theory. Therefore there was considerable interest in the reports of the latest observations of such modes. Broadly speaking, those observations confirm the cali­ bration by the high-degree modes, but there remain some systematic discrepancies that demand some revision of the theory. Besides the gross aspects of evolution theory, there are also more intricate details to be understood. Front Matter....Pages i-5 Foreword....Pages 7-8 Manifestation of the 160-min Solar Oscillations in Velocity and Brightness (Optical and Radio Observations)....Pages 9-19 Observation of Global 160-min Infrared (Differential) Intensity Variation of the Sun....Pages 21-35 Structure of the Solar Oscillation with Period Near 160 Minutes....Pages 37-42 The Measurement of Long-Period Oscillations at Sacramento Peak Observatory and South Pole....Pages 43-54 Full-Disk Observations of Solar Oscillations from the Geographic South Pole: Latest Results....Pages 55-66 Solar Oscillations Observed in the Total Irradiance....Pages 67-73 Detection of Solar Five-Minute Oscillations of Low Degree....Pages 75-87 Detection of Individual Normal Modes of Oscillation of the Sun in the Period Range from 2 Hr to 10 Min in Solar Diameter Studies....Pages 89-102 Helioseismology with High Degree p -Modes....Pages 103-109 Recent Observations of High-Degree Solar p -Mode Oscillations at the Kitt Peak National Observatory....Pages 111-111 Statistical Considerations in the Analysis of Solar Oscillation Data by the Superposed Epoch Method....Pages 113-122 On the Accuracy of Frequency Determination by an Autoregressive Spectral Estimator....Pages 123-128 On the Origin of Oscillations in a Solar Diameter Observed through the Earth’s Atmosphere: A Terrestrial Atmospheric or a Solar Phenomenon....Pages 129-138 Solar Diameter(s)....Pages 139-150 Short-Period Oscillations....Pages 151-155 Spectral-Spatial Analysis of Wave Motions in the Region of Temperature Minimum of the Sun’s Atmosphere....Pages 157-161 Observation of Five-Minute-Period Gravity Waves in the Solar Photosphere....Pages 163-164 Radiative Transfer and Solar Oscillations....Pages 165-204 A New Method for Determining the Helium Abundance in the Solar Atmosphere....Pages 205-207 160-min Oscillations of the Sun as the Mean of Study of its Internal Structure....Pages 209-213 Adiabatic Oscillations Of Solar Models With A High-Z Convective Core....Pages 215-222 Solar Models with Low Opacity....Pages 223-230 Theoretical Eigenfrequencies of Solar Oscillations of Low Harmonic Degree l in Five-Minute Range....Pages 231-232 Rotational Splitting of Solar Five-Minute Oscillations of Low Degree....Pages 233-234 Is There an Oblique Magnetic Rotator Inside the Sun?....Pages 235-235 The Study of Velocity Oscillations in the Solar Photosphere Using the Velocity Substraction Technique....Pages 237-243 A New System for Observing Solar Oscillations at the Mount Wilson Observatory....Pages 245-258 Resonant Coupling Between Solar Gravity Modes....Pages 259-266 Derivation of the Amplitude Equations of Acoustic Modes of an Unstable Semi-Infinite Polytrope....Pages 267-296 Kolmogorov Unstable Stellar Oscillations....Pages 297-321 On the Excitation of Oscillations of the Sun (Numerical Models)....Pages 323-329 A Convenient Method to Obtain Stellar Eigenfrequencies....Pages 331-341 On the Influence of Nonlinearities on the Eigenfrequencies of Five-Minute Oscillations of the Sun....Pages 343-354 On Waves in Non-Isothermal, Compressible, Ionized and Viscous Atmospheres....Pages 355-368 Seismology of Sunspot Atmospheres....Pages 369-378 Adiabatic Oscillations of a Differentially-Rotating Star Second-Order Perturbation Theory....Pages 379-382 Excitation of the Solar Oscillations by Objects Consisting of γ-Matter....Pages 383-385 Nonlinear Anelastic Modal Theory for Solar Convection....Pages 387-400 On The Detection Of Subphotospheric Convective Velocities and Temperature Fluctuations....Pages 401-410 Variability in the Power Spectrum of Solar Five-Minute Oscillations....Pages 411-425 Maunder Convection Mode on the Sun and Long Solar Activity Minima....Pages 427-436 Torsional Oscillations of the Sun....Pages 437-437 Evidence for the Phi-Dependent Rotation-Oscillation of the Sun (and for the Driving Mechanism of the Asymmetric Dynamo)....Pages 439-442 The Observations of 80-Min Oscillations in the Quiescent Prominences....Pages 443-445 Atmospheric Internal Gravity Waves as a Source of Quasiperiodic Variations of the Cosmic Ray Secondary Component and their Likely Solar Origin....Pages 447-449 160 M Pulsations in the Magnetosphere of the Earth Possibly Caused by Oscillations of the Sun....Pages 451-455 An Essay on Stellar Oscillations and Evolution....Pages 457-467 Stellar 5 Min Oscillations....Pages 469-486 Helioseismology in the Future....Pages 487-493 Back Matter....Pages 495-502