Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Duvall Jr., Thomas L."'
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 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:
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
Publikováno v:
A&A 601, A46 (2017)
Time-distance helioseismology is one of the primary tools for studying the solar meridional circulation. However, travel-time measurements of the subsurface meridional flow suffer from a variety of systematic errors, such as a center-to-limb variatio
Externí odkaz:
http://arxiv.org/abs/1704.00475
As large--distance rays (say, 10\,-\,$24 ^\circ$) approach the solar surface approximately vertically, travel times measured from surface pairs for these large separations are mostly sensitive to vertical flows, at least for shallow flows within a fe
Externí odkaz:
http://arxiv.org/abs/1207.6075
Convection in the solar interior is thought to comprise structures on a spectrum of scales. This conclusion emerges from phenomenological studies and numerical simulations, though neither covers the proper range of dynamical parameters of solar conve
Externí odkaz:
http://arxiv.org/abs/1206.3173
Measuring the depth variation of the meridional flows is important for understanding the solar cycle, at least according to a number of dynamo models. While attempting to extend the early observations of \citet{giles_thesis} of time-distance measurem
Externí odkaz:
http://arxiv.org/abs/0905.3132