Results 121 to 130 of about 1,260 (214)

Time-Distance Helioseismology with the MDI Instrument: Initial Results

, 1997
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 curvature
T. L. Duvall, Saba, J. L. R., Bush, R. I., A. G. Kosovichev, Bogart, R. S., Schou, J., R. S. Bogart, C. De Forest, Kosovichev, A. G., Milford, P. N., C. J. Wolfson, Wolfson, C. J., A. M. Title, Hoeksema, J. T., T. D. Tarbell, Title, A. M., DeForest, C., J. L. R. Saba, Duvall, T. L., Jr., Scherrer, P. H., J. Schou, Tarbell, T. D., P. N. Milford, P. H. Scherrer, R. I. Bush, J. T. Hoeksema   +25 more
core   +1 more source

The Shape of the Solar Tachocline

The Astrophysical Journal
Early helioseismic results have shown that the tachocline has a prolate shape. However, the models used in those studies constrained the tachocline to be either prolate or oblate.
Sarbani Basu, Sylvain G. Korzennik
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

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

Latitude-dependent Time Variations of the Solar Tachocline

The Astrophysical Journal
We have examined how the characteristics of the tachocline—i.e., the change in rotation rate δ Ω, or the “jump,” the position of the midpoint of the tachocline, r _d , and the width of the tachocline, w _d —change as a function of time at different ...
Sarbani Basu, Sylvain G. Korzennik, Sushanta C. Tripathy   +2 more
doaj   +1 more source

Solar Flare 1/f Fluctuations from Amplitude-Modulated Five-Minute Oscillation. [PDF]

Entropy (Basel), 2023
Morikawa M, Nakamichi A.
europepmc   +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  

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

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

Local Helioseismology: Three-Dimensional Imaging of the Solar Interior

, 2010
The Sun supports a rich spectrum of internal waves that are continuously excited by turbulent convection. The Global Oscillation Network Group (GONG) network and the SOHO/MDI (Solar and Heliospheric Observatory/Michelson Doppler Imager) space instrument ...
Gizon, Laurent, Spruit, H., Spruit, H. C., Laurent Gizon, Birch, A. C., Henk C. Spruit, Birch, Aaron C., Birch, A., Gizon, L., Spruit, H.C., Aaron C. Birch, Spruit, Henk C., Birch, A.C.   +12 more
core   +1 more source