296 citations · 4.5k across the 162 of their papers we have counts for
13 papers · 1 filter
Detection of Supergranulation Alignment in Polar Regions of the Sun by Helioseismology
Kaori Nagashima, Junwei Zhao, Alexander G. Kosovichev +1
We report on a new phenomenon of `alignment' of supergranulation cells in the polar regions of the Sun. Recent high-resolution datasets obtained by the Solar Optical Telescope onbo…
Numerical MHD Simulations of Solar Magnetoconvection and Oscillations in Inclined Magnetic Field Regions
I. N. Kitiashvili, A. G. Kosovichev, N. N. Mansour +1
The sunspot penumbra is a transition zone between the strong vertical magnetic field area (sunspot umbra) and the quiet Sun. The penumbra has a fine filamentary structure that is c…
Towards Waveform Heliotomography: Observing Interactions of Helioseismic Waves with a Sunspot
Junwei Zhao, Alexander G. Kosovichev, Stathis Ilonidis
We investigate how helioseismic waves that originate from effective point sources interact with a sunspot. These waves are reconstructed from observed stochastic wavefields on the…
Excitation of acoustic waves by vortices in the quiet Sun
I. N. Kitiashvili, A. G. Kosovichev, N. N. Mansour +1
Five-minutes oscillations is one of the basic properties of solar convection. Observations show mixture of a large number of acoustic wave fronts propagating from their sources. We…
Local helioseismology of sunspot regions: comparison of ring-diagram and time-distance results
A. G. Kosovichev, S. Basu, R. Bogart +10
Local helioseismology provides unique information about the subsurface structure and dynamics of sunspots and active regions. However, because of complexity of sunspot regions loca…
Modeling of the subgrid-scale term of the filtered magnetic field transport equation
G. Balarac, A. G. Kosovichev, O. Brugière +2
Accurate subgrid-scale turbulence models are needed to perform realistic numerical magnetohydrodynamic (MHD) simulations of the subsurface flows of the Sun. To perform large-eddy s…