Results 101 to 110 of about 253 (148)
Modeling of the sun based on helioseismology and investigation of the solar neutrino problem
, 1997 openaire +1 more source
A Full-Sun Magnetic Index from Helioseismology Inferences
Solar Physics, 2013 Solar magnetic indices are used to model the solar irradiance and ultimately to forecast it. However, the observation of such indices is generally limited to the Earth-facing hemisphere of the Sun. Seismic maps of the far side of the Sun have proven their capability to locate and track medium–large active regions at the non-visible hemisphere.
J. I. Gónzalez Hernández +6 more
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The ‘Standard’ Sun Modelling and Helioseismology
Space Science Reviews, 1998 The ‘standard’ solar model is based on a number of simplifying assumptions and depends on knowledge of the physical properties of matter in the Sun. Given these assumptions, the constraint that the model have the observed surface luminosity provides an estimate of the initial solar helium abundance. From helioseismic analyses further information can be
J. Christensen‐Dalsgaard
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Observational Results of Full-Disc Helioseismology: Implications for Seismology of Sun-like Stars
Solar Physics, 2004 A brief review of observational full-disc helioseismology is carried out with emphasis on issues of interest in the developing field of seismology of Sun-like stars. The frequency precision obtained from extended full-disc helioseismic data sets and the activity cycle variation of solar p-mode parameters are summarised and related to recent and ...
R. New
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Helioseismology—sound inside the sun
The Journal of the Acoustical Society of America, 2001In 1960, the solar surface was found to be moving radially with a period of 5 min. The cause of this effect was found to be the trapping of acoustic waves in the solar internal thermal gradient. Since the sound fills a resonant cavity, only specific oscillatory modes are present whose characteristics depend on the plasma properties.
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Solar-cycle dependence of the Sun's deep internal rotation shown by helioseismology
Nature, 1991HELIOSEISMOLOGY, the study of solar oscillations, yields information on the Sun's internal rotation and magnetism which is of great importance in understanding the 22-year solar cycle. We show here that helioseismic data suggest that the Sun's internal rotation rate, at depths greater than half the solar radius, has changed systematically during the ...
Philip R. Goode, W. A. Dziembowski
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The sun's internal differential rotation from helioseismology
2008Well-confirmed helioseismic data from several groups using various observational techniques at different sites have allowed us to determine the differential rotation in the outer half of the Sun's interior. The resulting rotation law is simple — the surface differential rotation persists through much of the convection zone with a transition toward ...
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The structure and dynamics of the sun from helioseismology, and the neutrino problem
2008The inversion of thousands of p-modes, identified with great accuracy, has clearly demonstrated the substantial correctness of the standard solar models. The use of the new equation of state and opacity tables, together with the element diffusion towards the central regions of the Sun, has allowed the construction of solar models which are consistent ...
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AIP Conference Proceedings, 2007
The recent downward revision of the solar CNO photospheric abundances now leads to severe inconsistencies between theoretical models for the Sun's internal structure and the results of helioseismology. There have been claims that the solar Ne abundance may be underestimated and that an increase in this ill‐defined quantity could alleviate (or even ...
Thierry Morel +5 more
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The recent downward revision of the solar CNO photospheric abundances now leads to severe inconsistencies between theoretical models for the Sun's internal structure and the results of helioseismology. There have been claims that the solar Ne abundance may be underestimated and that an increase in this ill‐defined quantity could alleviate (or even ...
Thierry Morel +5 more
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2002
Inverse and forward helioseismic approaches are reviewed. Chemical abundance profiles from a solar model generated by Takata and Shibahashi (1998) by inverse helioseismology are used in a forward approach. This forward model is referred to as the author’s ‘seismic’ solar model.
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Inverse and forward helioseismic approaches are reviewed. Chemical abundance profiles from a solar model generated by Takata and Shibahashi (1998) by inverse helioseismology are used in a forward approach. This forward model is referred to as the author’s ‘seismic’ solar model.
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