Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Hanasoge, S. M."'
Publikováno v:
A&A 652, A96 (2021)
Retrograde Rossby waves, measured to have significant amplitudes in the Sun, likely have notable implications for various solar phenomena. Rossby waves create small-amplitude, very-low frequency motions (on the order of the rotation rate and lower),
Externí odkaz:
http://arxiv.org/abs/2106.03971
Accurate inference of solar meridional flow is of crucial importance for the understanding of solar dynamo process. Wave travel times, as measured on the surface, will change if the waves encounter perturbations e.g. in the sound speed or flows, as t
Externí odkaz:
http://arxiv.org/abs/1807.00314
Recently, Duvall and Hanasoge ({\it Solar Phys.} {\bf 287}, 71-83, 2013) found that large distance $[\Delta]$ separation travel-time differences from a center to an annulus $[\delta t_{\rm{oi}}]$ implied a model of the average supergranular cell that
Externí odkaz:
http://arxiv.org/abs/1404.2533
Supergranulation is one of the most visible length scales of solar convection and has been studied extensively by local helioseismology. We use synthetic data computed with the Seismic Propagation through Active Regions and Convection (SPARC) code to
Externí odkaz:
http://arxiv.org/abs/1211.6886
Autor:
Jackiewicz, J., Birch, A. C., Gizon, L., Hanasoge, S. M., Hohage, T., Ruffio, J. -B., Svanda, M.
Publikováno v:
Solar Phys, 2012, 276, 19-33
Inversions for local helioseismology are an important and necessary step for obtaining three-dimensional maps of various physical quantities in the solar interior. Frequently, the full inverse problems that one would like to solve prove intractable b
Externí odkaz:
http://arxiv.org/abs/1109.2712
According to time-distance helioseismology, information about internal fluid motions is encoded in the travel times of solar waves. The inverse problem consists of inferring 3-D vector flows from a set of travel-time measurements. Here we investigate
Externí odkaz:
http://arxiv.org/abs/1104.4083
Autor:
Moradi, H., Hanasoge, S. M.
Publikováno v:
Magnetic Coupling between the Interior and Atmosphere of the Sun, edited by S.S. Hasan and R.J. Rutten; Astrophysics and Space Science Proceedings. Published by Springer Berlin Heidelberg; 2010, pp.378-385
In sequel to Moradi et al. [2009, ApJ, 690, L72], we employ two established numerical forward models (a 3D ideal MHD solver and MHD ray theory) in conjunction with time-distance helioseismology to probe the lateral extent of wave-speed perturbations
Externí odkaz:
http://arxiv.org/abs/1101.0125
Perfectly matched layers are a very efficient and accurate way to absorb waves in media. We present a stable convolutional unsplit perfectly matched formulation designed for the linearized stratified Euler equations. However, the technique as applied
Externí odkaz:
http://arxiv.org/abs/1003.0725
Autor:
Gizon, L., Schunker, H., Baldner, C. S., Basu, S., Birch, A. C., Bogart, R. S., Braun, D. C., Cameron, R., Duvall Jr., T. L., Hanasoge, S. M., Jackiewicz, J., Roth, M., Stahn, T., Thompson, M. J., Zharkov, S.
Publikováno v:
Space Science Reviews, Volume 144, Issue 1-4, page 249, 2009
Various methods of helioseismology are used to study the subsurface properties of the sunspot in NOAA Active Region 9787. This sunspot was chosen because it is axisymmetric, shows little evolution during 20-28 January 2002, and was observed continuou
Externí odkaz:
http://arxiv.org/abs/1002.2369
We constrain the velocity spectral distribution of global-scale solar convective cells at depth using techniques of local helioseismology. We calibrate the sensitivity of helioseismic waves to large-scale convective cells in the interior by analyzing
Externí odkaz:
http://arxiv.org/abs/1001.4508