4 papers · 1 filter
Traveling Waves of Magnetoconvection and the Origin of the Evershed Effect in Sunspots
Irina N. Kitiashvili, Alexander G. Kosovichev, Alan A. Wray +1
Discovered in 1909 the Evershed effect represents strong mass outflows in sunspot penumbra, where the magnetic field of sunspots is filamentary and almost horizontal. These flows p…
Helioseismic Signature of Chromospheric Downflows in Acoustic Travel-Time Measurements from Hinode
Kaori Nagashima, Takashi Sekii, Alexander G. Kosovichev +2
We report on a signature of chromospheric downflows in two emerging-flux regions detected by time-distance helioseismology analysis. We use both chromospheric intensity oscillation…
Realistic Numerical Modeling of Solar Magnetoconvection and Oscillations
Irina Kitiashvili, Laetitia Jacoutot, Alexander Kosovichev +2
We have developed 3D, compressible, non-linear radiative MHD simulations to study the influence of the magnetic field of various strength and geometry on the turbulent convective c…
Signatures of emerging subsurface structures in the sun
T. Hartlep, A. G. Kosovichev, J. Zhao +1
The complex dynamics that lead to the emergence of active regions on the sun are poorly understood. One possibility is that magnetic structures (flux tubes, etc.) rise from below t…