Results 91 to 100 of about 6,507 (247)

Helioseismic Signature of Parker Fragmentation of Magnetic Flux beneath Sunspot Photospheres

The Astrophysical Journal Letters
Standard 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, Angel Mart Cifuentes, Alina-Catalina Donea, Charles Lindsey   +3 more
doaj   +1 more source

New Results on Standard Solar Models

, 2009
We describe the current status of solar modelling and focus on the problems originated with the introduction of solar abundance determinations with low CNO abundance values.
A. Weiss, Aldo M. Serenelli, B. Aharmim, B. Aharmim, C. Allende Prieto, C. Arpesella, C. Fröhlich, C.H. Lin, F. Delahaye, H.M. Antia, H.M. Antia, I.W. Roxburgh, J. Guzik, J.A. Guzik, J.C. Christensen-Dalsgaard, J.C. Christensen-Dalsgaard, J.C. Christensen-Dalsgaard, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.N. Bahcall, J.W. Ferguson, M. Asplund, M. Castro, N. Grevesse, N. Grevesse, N.R. Badnell, Q.R. Ahmad, S. Basu, S. Basu, S. Basu, S. Turck-Chiéze, W.C. Haxton, W.J. Chaplin   +37 more
core   +1 more source

Seismic Sounding of Convection in the Sun

, 2015
Our Sun, primarily composed of ionized hydrogen and helium, has a surface temperature of 5777~K and a radius $R_\odot \approx 696,000$ km. In the outer $R_\odot/3$, energy transport is accomplished primarily by convection.
Gizon, Laurent, Hanasoge, Shravan, Sreenivasan, Katepalli R.   +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 Letters
Helioseismology 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, Armand Leclerc, Guillaume Laibe, Pierre Delplace, Antoine Venaille   +4 more
doaj   +1 more source

Outgoing modal solutions for Galbrun's equation in helioseismology

, 2021
Hélène Barucq, Florian Faucher, D. Fournier, L. Gizon, Ha Pham   +4 more
openalex   +1 more source

Stray Light Correction for the Helioseismic and Magnetic Imager

The Astrophysical Journal Supplement Series
We report a point-spread function (PSF) and deconvolution procedure to remove stray light from the Helioseismic and Magnetic Imager (HMI) data. Prelaunch calibration observations, postlaunch Venus transit, and lunar transit data were used to develop the ...
A. A. Norton, T. L. Duvall Jr., J. Schou, R. S. Bogart, Junwei Zhao, M. C. Rabello-Soares, P. J. Levens, J. T. Hoeksema, C. S. Baldner   +8 more
doaj   +1 more source

A Review of Space Helioseismology [PDF]

Symposium - International Astronomical Union, 1997
The helioseismology started in 1960 with the discovery of oscillations of the velocity field on the solar surface by Leighton, 1960. The mechanism producing these oscillations remained unexplained for the next ten years until Ulrich, 1970, and independently Leibacher and Stein, 1971, demonstrated that acoustic waves trapped beneath the solar surface ...
openaire   +1 more source

Editorial: The Future of Asteroseismology

Frontiers in Astronomy and Space Sciences, 2021
Joyce Ann Guzik, Markus Roth
doaj   +1 more source

Determining the initial helium abundance of the Sun

, 2010
We determine the dependence of the initial helium abundance and the present-day helium abundance in the convective envelope of solar models ($\yim$ and $\ysm$ respectively) on the parameters that are used to construct the models.
Aldo M. Serenelli, Asplund, Bahcall, Bahcall, Bahcall, Bahcall, Basu, Basu, Boothroyd, Caffau, Carigi, Casagrande, Christensen-Dalsgaard, Fiorentini, Gennaro, Grevesse, Guzik, Haxton, Izotov, Larson, Lodders, Ludwig, Peimbert, Pietrinferni, Pinsonneault, Renzini, Sarbani Basu, Schaller, Serenelli, Spergel, Turcotte, Yi   +31 more
core   +1 more source

Constraints on proton-proton fusion from helioseismology [PDF]

, 2002
Kevin I. T. Brown, M. N. Butler, D. B. Guenther   +2 more
openalex   +1 more source