Results 91 to 100 of about 1,568 (212)

Understanding the Travel-time Asymmetry of Acoustic Waves in Sunspots with Time–Distance Helioseismology

The Astrophysical Journal
Mapping the subsurface structure and flow field of sunspots has been a challenging task for helioseismology. In this work, we investigate the propagation of acoustic waves in a sunspot in NOAA active region 11312 using time–distance helioseismology ...
Haiyu Li, Tobías Felipe, Elena Khomenko, Hui Tian, S. P. Rajaguru, Yuhang Gao   +5 more
doaj   +1 more source

Local helioseismology and correlation tracking analysis of surface structures in realistic simulations of solar convection

, 2007
Time-distance helioseismology, scale simulations of solar convection Udgivelsesdato ...
Stein, Robert F., Kosovichev, Alexander, Georgobiani, Dali, Zhao, Junwei, Nordlund, Åke, Benson, David   +5 more
core   +1 more source

Application of Fano profiles to asymmetric resonances in helioseismology

, 2001
Parallels are drawn between the asymmetric resonance profiles observed in global helioseismology and the Fano theory for autoionisation profiles in atomic spectroscopy.
P. Boumier, S. Thiery, A. H. Gabriel, J.-P. Connerade   +3 more
core   +1 more source

Time-dependence of Subsurface Solar Convection Using the Time–Distance Deep-focus Method

The Astrophysical Journal
We 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, Alexander G. Kosovichev, Gustavo Guerrero, Andrey M. Stejko   +3 more
doaj   +1 more source

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

Editorial: The Future of Asteroseismology

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

Full Waveform Inversion for Time-Distance Helioseismology

, 2014
Inferring interior properties of the Sun from photospheric measurements of the seismic wavefield constitutes the helioseismic inverse problem. Deviations in seismic measurements (such as wave travel times) from their fiducial values estimated for a given
Tromp, J., Tromp, Jeroen, Hanasoge, S., Hanasoge, Shravan M   +3 more
core   +1 more source

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, Elsworth, Yvonne, Broomhall, Anne-marie   +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

Helioseismology

, 1988
Many of the oscillations observed at the solar surface have been identified with resonant normal modes of the entire solar body. Accurate measurements of frequencies' of these modes enable us to study the internal structure and dynamics of the Sun ...
Antia, H. M.
core