Results 91 to 100 of about 1,260 (214)
Reconstruction of Solar Subsurfaces by Local Helioseismology
, 2016 Local helioseismology has opened new frontiers in our quest for understanding of the internal dynamics and dynamo on the Sun. Local helioseismology reconstructs subsurface structures and flows by extracting coherent signals of acoustic waves traveling ...
Kosovichev, Alexander G. +3 more
core +1 more source
, 1992 The observed deficit of $\rm ^8B$ solar neutrinos may call for an improved standard model of the sun or an expanded standard model of particle physics ({\it e.g.,} with neutrino masses and mixing). In the former case, contemporary fluid motions and thermal fluctuations in the sun's core may modify nuclear reaction rates and restore agreement.
De Rújula, A., Glashow, S. L.
openaire +2 more sources
Time-dependence of Subsurface Solar Convection Using the Time–Distance Deep-focus Method
The Astrophysical JournalWe reexamine the deep-focus methodology of time–distance helioseismology previously used to estimate the power spectrum of the solar convection at a depth of about 30 Mm, which was found to be significantly weaker than predicted by theory and simulations.
John T. Stefan +3 more
doaj +1 more source
Time-Distance Helioseismology: Noise Estimation
, 2004 As in global helioseismology, the dominant source of noise in time-distance helioseismology measurements is realization noise due to the stochastic nature of the excitation mechanism of solar oscillations.
Gizon, Laurent +3 more
core +1 more source
Bulletin de la Société Royale des Sciences de Liège, 2020 Helioseismology is one of the most successful fields of astrophysics. The observation and character-ization of solar oscillation has allowed solar seismologists to study the internal structure and dynamics of the Sun with unprecedented thoroughness. Ground-based networks and dedicated space missions have delivered data of exquisite quality, enabling ...
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Helioseismic Signature of Parker Fragmentation of Magnetic Flux beneath Sunspot Photospheres
The Astrophysical Journal LettersStandard local helioseismic diagnostics of large sunspots show the signature of anomalously strong compact scatterers of p -modes within about 1 Mm beneath their photospheres.
Elena G. Broock +3 more
doaj +1 more source
, 2010 Time-distance helioseismology is a method of ambient noise imaging using the solar oscillations. The basic realization that led to time-distance helioseismology was that the temporal cross correlation of the signals at two 'surface' (or photospheric ...
Duvall, Thomas L., Jr.
core
Helioseismology - a clear view of the interior [PDF]
, 2011 Helioseismology is a very powerful tool that allows us to explore the interior of the Sun. Here we give particular emphasis to the justification for the likely location of the zone that is most sensitive to cycle-related changes. For the low degree modes
Chaplin, William +2 more
core +1 more source
A Core-sensitive Mixed f/g-mode of the Sun Predicted by Wave Topology and Hydrodynamical Simulation
The Astrophysical Journal LettersHelioseismology has revolutionized our understanding of the Sun by analyzing its global oscillation modes. However, the solar core remains elusive, limiting a full understanding of its evolution.
Arthur Le Saux +4 more
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New Solar Metallicity Measurements
Atoms, 2019 In the past years, a systematic downward revision of the metallicity of the Sun has led to the “solar modeling problem„, namely the disagreement between predictions of standard solar models and inferences from helioseismology.
Sunny Vagnozzi
doaj +1 more source