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Article
On the detection of subphotospheric convective velocities and temperature fluctuations
A procedure is outlined for estimating the influence of large-scale convective eddies on the wave patterns of five-minute oscillations of high degree. The method is applied to adiabatic oscillations, with freq...
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Chapter and Conference Paper
On The Detection Of Subphotospheric Convective Velocities and Temperature Fluctuations
A procedure is outlined for estimating the influence of large-scale convective eddies on the wave patterns of five-minute oscillations of high degree. The method is applied to adiabatic oscillations, with freq...
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Article
Period doubling and chaos in partial differential equations for thermosolutal convection
Numerical experiments on two-dimensional thermosolutal convection reveal a transition from periodic oscillations to chaos through a sequence of period-doubling bifurcations. Within the chaotic region there are...
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Chapter and Conference Paper
Oscillatory Doubly Diffusive Convection: Theory and Experiment
Doubly diffusive convection in its various forms offers an excellent opportunity to study the dynamics near a Hopf bifurcation in a continuous system. Over the last year theoretical and numerical studies have ...
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Chapter and Conference Paper
Interaction of acoustic oscillations with time-dependent compressible convection
We present the results of numerical simulations in which acoustic waves are driven into a two-dimensional layer of compressible fluid which is undergoing convection. The energetics of the waves are analyzed by...
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Chapter and Conference Paper
On the analysis of physical wave trains
When a wave train whose constituent frequencies and wave numbers are unresolved by observation propagates through an inhomogeneous medium, beating between the components can contaminate deductions one might na...
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Chapter
Solar Radiation and Structure
At the XXIst IAU General Assembly in Buenos Aires in 1991 the name of Commission 12 was changed from “Radiation and Structure of the Solar Atmosphere” to “Solar Radiation and Structure”. The new name better re...
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Chapter
Structure and Rotation of the Solar Interior: Initial Results from the MDI Medium-L Program
The medium-l program of the Michelson Doppler Imager instrument on board SOHO provides continuous observations of oscillation modes of angular degree, l, from 0 to ∼ 300. The data for the program are partly proce...
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Article
STRUCTURE AND ROTATION OF THE SOLAR INTERIOR: INITIAL RESULTS FROM THE MDI MEDIUM-L PROGRAM
The medium-l program of the Michelson Doppler Imager instrument on board SOHO provides continuous observations of oscillation modes of angular degree, l, from 0 to ∽ 300. The data for the program are partly proce...
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Article
Time Variability of Rotation in Solar Convection Zone From soi-mdi
The variation of rotation in the convection zone over a period of two years from mid-1996 is studied using inversions of SOI–MDI data. We confirm the existence of near-surface banded zonal flows migrating towa...
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Article
Solar shear flows deduced from helioseismic dense-pack samplings of ring diagrams
We report on large-scale horizontal flows in the solar convection zone and their variability in time and space using a local-helioseismology technique known as ring-diagram analysis. By performing this analysi...
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Article
Phase inversion of one-dimensional artificial seismic data
Oscillations of an inhomogeneous one-dimensional loop have been simulated for the purpose of examining the effect of excitation and dam** on the sound-speed inversion based on phase analysis. It has been dem...
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Chapter
Solar Shear Flows Deduced From Helioseismic Dense-Pack Samplings of Ring Diagrams
We report on large-scale horizontal flows in the solar convection zone and their variability in time and space using a local-helioseismology technique known as ring-diagram analysis. By performing this analysi...
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Chapter
Time Variability of Rotation in Solar Convection Zone From SOI-MDI
The variation of rotation in the convection zone over a period of two years from mid-1996 is studied using inversions of SOI-MDI data. We confirm the existence of near-surface banded zonal flows migrating towa...
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Article
Organized Subsurface Flows near Active Regions
Local helioseismic techniques, such as ring analysis and time-distance helioseismology, have already shown that large-scale flows near the surface converge towards major active regions. Ring analysis has furth...
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Article
Prospects and Challenges for Helioseismology
Helioseismology has advanced considerably our knowledge of the interior of the Sun over the past three decades. Our understanding of the Sun’s internal structure, its dynamics, rotation, convection and magneti...
