Zobrazeno 1 - 10
of 262
pro vyhledávání: '"Duvall JR"'
Publikováno v:
A&A 649, A59 (2021)
Understanding convection is important in stellar physics, for example as an input in stellar evolution models. Helioseismic estimates of convective flow amplitudes in deeper regions of the solar interior disagree by orders of magnitude among themselv
Externí odkaz:
http://arxiv.org/abs/2102.08603
Autor:
Hanson, Chris S., Duvall Jr., Thomas L., Birch, Aaron C., Gizon, Laurent, Sreenivasan, Katepalli R.
Publikováno v:
A&A 644, A103 (2020)
Context: Giant-cell convection is believed to be an important component of solar dynamics. For example, it is expected to play a crucial role in maintaining the Sun's differential rotation. Aims: We re-examine early reports of giant convective cells
Externí odkaz:
http://arxiv.org/abs/2010.13052
Publikováno v:
A&A 643, A168 (2020)
Context. The frequencies, lifetimes, and eigenfunctions of solar acoustic waves are affected by turbulent convection, which is random in space and in time. Since the correlation time of solar granulation and the periods of acoustic waves ($\sim$5 min
Externí odkaz:
http://arxiv.org/abs/2010.01174
Publikováno v:
A&A 635, A181 (2020)
Context. The spatial power spectrum of supergranulation does not fully characterize the underlying physics of turbulent convection. For example, it does not describe the non-Gaussianity in the horizontal flow divergence. Aims. Our aim is to statistic
Externí odkaz:
http://arxiv.org/abs/2002.08262
Publikováno v:
A&A 626, A3 (2019)
Context. Solar Rossby waves (r modes) have recently been discovered in the near-surface horizontal flow field using the techniques of granulation-tracking and ring-diagram analysis applied to six years of SDO/HMI data. Aims. Here we apply time-distan
Externí odkaz:
http://arxiv.org/abs/1812.07413
Publikováno v:
A&A 619, A99 (2018)
The south-north travel-time differences are measured by applying time-distance helioseismology to the MDI and HMI medium-degree Dopplergrams covering May 1996-April 2017. Our data analysis corrects for several sources of systematic effects: P-angle e
Externí odkaz:
http://arxiv.org/abs/1808.08874
Autor:
Kosovichev, A. G., Duvall Jr, T. L.
Publikováno v:
SCORe'96: Solar Convection and Oscillations and their Relationship, Eds.: F.P. Pijpers, J. Christensen-Dalsgaard, and C.S. Rosenthal, Kluwer (Astrophysics and Space Science Library Vol. 225), p. 241-260, 1997
We present a new method for helioseismic diagnostics of the three-dimensional structure of sound speed, magnetic fields and flow velocities in the convection zone by inversion of acoustic travel-time data. The data are measurements of the time for ac
Externí odkaz:
http://arxiv.org/abs/1806.03273
Previous helioseismology of sunspots has been sensitive to both the structural and magnetic aspects of sunspot structure. We aim to develop a technique that is insensitive to the magnetic component so the two aspects can be more readily separated. We
Externí odkaz:
http://arxiv.org/abs/1806.01032
Autor:
Löptien, Björn, Gizon, Laurent, Birch, Aaron C., Schou, Jesper, Proxauf, Bastian, Duvall Jr., Thomas L., Bogart, Richard S., Christensen, Ulrich R.
Publikováno v:
Nature Astronomy (2018)
The Sun's complex dynamics is controlled by buoyancy and rotation in the convection zone and by magnetic forces in the atmosphere and corona. While small-scale solar convection is well understood, the dynamics of large-scale flows in the solar convec
Externí odkaz:
http://arxiv.org/abs/1805.07244