Results 171 to 180 of about 1,264 (214)
Helioseismology and solar abundances [PDF]
Physics Reports, 2008 To appear in Physics Reports.
Sarbani Basu, H M Antia
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Recent Developments in Local Helioseismology [PDF]
Solar Physics, 2008 Local helioseismology is providing new views of subphotospheric flows from supergranulation to global-scale meridional circulation and for studying structures and dynamics in the quiet Sun and active regions. In this short review we focus on recent developments, and in particular on a number of current issues, including the sensitivity of different ...
Zharkov S, S Zharkov, Thompson M J
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Outstanding problems in local helioseismology [PDF]
Astronomische Nachrichten, 2007 Time‐distance helioseismology and related techniques show great promise for probing the structure and dynamics of the subphotospheric layers of the Sun. Indeed time‐distance helioseismology has already been applied to make inferences about structures and
Laurent Gizon
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Local helioseismology using ring diagram analysis [PDF]
Astronomische Nachrichten, 2007 Ring diagram analysis is an extension of global helioseismology that is applied to small areas on the Sun. It can be used to infer the horizontal components of large scale flows as well as the structure, and variations thereof, in the outer convection ...
H M Antia
exaly +2 more sources
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EAS Publications Series, 2007
Helioseismic inferences have demonstrated very clearly the importance of including element diffusion and settling in solar modelling: models incorporating these processes are in substantially better agreement with the inferred solar sound speed than are models that neglect them.
Christensen-Dalsgaard, Jørgen; id_orcid 0000-0001-5137-0966 +1 more
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Helioseismic inferences have demonstrated very clearly the importance of including element diffusion and settling in solar modelling: models incorporating these processes are in substantially better agreement with the inferred solar sound speed than are models that neglect them.
Christensen-Dalsgaard, Jørgen; id_orcid 0000-0001-5137-0966 +1 more
openaire +2 more sources
Science, 1991
Globally coherent oscillation modes were discovered in the sun about a decade ago, providing a unique seismological probe of the solar interior. Current observations detect modes that are phase-coherent for up to 1 year, with surface velocity amplitudes as low as 2 millimeters per second, and thousands of mode frequencies have been ...
Libbrecht, K. G., Woodard, M. F.
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Globally coherent oscillation modes were discovered in the sun about a decade ago, providing a unique seismological probe of the solar interior. Current observations detect modes that are phase-coherent for up to 1 year, with surface velocity amplitudes as low as 2 millimeters per second, and thousands of mode frequencies have been ...
Libbrecht, K. G., Woodard, M. F.
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An Introduction to Helioseismology
2000In no other case has stellar variability been honed to such a sharp astrophysical tool as for the Sun. The extreme richness of oscillation data available for the Sun, as a result of its proximity and the nature of the excitation processes responsible for the oscillations, provides us with a scalpel which allows us to dissect in minute detail, layer by ...
Christensen-Dalsgaard, J.; id_orcid 0000-0001-5137-0966 +3 more
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Perspectives in Helioseismology
Science, 1996Helioseismology is probing the interior structure and dynamics of the sun with ever-increasing precision, providing a well-calibrated laboratory in which physical processes can be studied under conditions that are unattainable on Earth. Nearly 10 million resonant modes of oscillation are observable in the solar atmosphere, and their frequencies need to
, Gough +3 more
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Solar Models and Helioseismology
2000Helioseismic results put very important constraints on structure of the solar models, which can not be reachable by another way. These constraints lead toward what we should do to obtain a solar model in good agreement with the Sun. In this connection, diffusion of chemical elements took its indispensable part in the standard solar models.
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Laser heterodyne spectrometer for helioseismology
Applied Optics, 1986The technique of laser heterodyne spectroscopy has been applied to the measurement of solar oscillations. Coherent mixing of solar radiation with the output of a frequency-stabilized CO2 laser permits the measurement of fully resolved profiles of solar absorption lines with high spectral purity and excellent frequency stability. This technique has been
D A, Glenar +4 more
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