Results 111 to 120 of about 1,568 (212)

Helioseismology and Asteroseismology: Looking for Gravitational Waves in Acoustic Oscillations

, 2014
International audienceCurrent helioseismology observations allow the determination of the frequencies and surface velocity amplitudes of solar acoustic modes with exceptionally high precision. In some cases, the frequency accuracy is better than one part
Lopes, Ilídio, Silk, Joseph
core   +1 more source

Time-Distance Helioseismology With The Mdi Instrument: Initial Results

, 2007
. In time-distance helioseismology, the travel time of acoustic waves is measured between various points on the solar surface. To some approximation, the waves can be considered to follow ray paths that depend only on a mean solar model, with the ...
T. D. Tarbell, T. L. Duvall, J. L. R. Saba, Jr., A. G. Kosovichev, R. S. Bogart, J. Schou, C. De Forest, P. H. Scherrer, C. J. Wolfson, A. M. Title, R. I. Bush, J. T. Hoeksema   +12 more
core  

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., Alexander G. Kosovichev, Junwei Zhao, Zhao, Junwei   +3 more
core   +1 more source

A mixed solar core, solar neutrinos and helioseismology

, 1998
We consider a wide class of solar models with mixed core. Most of these models can be excluded as the sound speed profile that they predict is in sharp disagreement with helioseismic constraints.
S. DEGL'INNOCENTI, DEGL'INNOCENTI, SCILLA, Ricci B., RICCI, Barbara   +3 more
core   +1 more source

Inversion of full acoustic wavefield in local helioseismology: a study with synthetic data

, 2011
We present the first results from the inversion of full acoustic wavefield in the helioseismic context. In contrast to time-distance helioseismology, which involves analyzing the travel times of seismic waves propagating into the solar interior ...
Cobden, L.J., L. J. Cobden, Tong, Vincent C.H., Seismology, Tong, C.H., NERIES: Network of research infrastructures for European seismology, M. R. Warner, C. H. Tong, Warner, M.R., Research Programme in Earth Sciences Utrecht (DES / IVAU)   +9 more
core   +1 more source

Towards passive non-line-of-sight acoustic localization around corners using uncontrolled random noise sources. [PDF]

Sci Rep, 2023
Boger-Lombard J, Slobodkin Y, Katz O.
europepmc   +1 more source

Constraint on Light Dipole Dark Matter from Helioseismology

, 2014
International audienceWe investigate the effects of a magnetic dipole moment of asymmetric dark matter (DM) in the evolution of the Sun. The dipole interaction can lead to a sizable DM scattering cross section even for light DM, and asymmetric DM can ...
Lopes, Ilídio, Kadota, Kenji, Silk, Joseph   +2 more
core   +1 more source

Characterizing the Observational Properties of the Sun’s High-latitude m = 1 Inertial Mode

The Astrophysical Journal
Low- m inertial modes have been recently discovered in the Sun’s high-latitude regions. In this study, we characterize the observational properties of the m = 1 mode by analyzing time–distance subsurface flow maps.
Boyang Ding, Junwei Zhao, Ruizhu Chen, Matthias Waidele, Sushant S. Mahajan, Oana Vesa   +5 more
doaj   +1 more source

Juno spacecraft gravity measurements provide evidence for normal modes of Jupiter. [PDF]

Nat Commun, 2022
Durante D, Guillot T, Iess L, Stevenson DJ, Mankovich CR, Markham S, Galanti E, Kaspi Y, Zannoni M, Gomez Casajus L, Lari G, Parisi M, Buccino DR, Park RS, Bolton SJ.   +14 more
europepmc   +1 more source

The Sun’s Dark Core: Helioseismic and Neutrino Flux Constraints on a Compact Solar Center

The Astrophysical Journal
As dark matter appears to comprise most of the Galactic mass, some of it may accumulate in the cores of stars, thereby making the Sun a laboratory for constraining various dark matter theories.
Earl P. Bellinger, Matt E. Caplan
doaj   +1 more source