296 citations · 4.5k across the 162 of their papers we have counts for
8 papers · 1 filter
Travel Time Shifts due to Amplitude Modulation in Time-Distance Helioseismology
R. Nigam, A. G. Kosovichev
Correct interpretation of acoustic travel times measured by time-distance helioseismology is essential to get an accurate understanding of the solar properties that are inferred fr…
High Resolution Helioseismic Imaging of Subsurface Structures and Flows of A Solar Active Region Observed by Hinode
Junwei Zhao, Alexander G. Kosovichev, Takashi Sekii
We analyze a solar active region observed by the Hinode CaII H line using the time-distance helioseismology technique, and infer wave-speed perturbation structures and flow fields…
The quest for the solar g modes
T. Appourchaux, K. Belkacem, A. M. Broomhall +18
Solar gravity modes (or g modes) -- oscillations of the solar interior for which buoyancy acts as the restoring force -- have the potential to provide unprecedented inference on th…
Imaging the Solar Tachocline by Time-Distance Helioseismology
Junwei Zhao, Thomas Hartlep, A. G. Kosovichev +1
The solar tachocline at the bottom of the convection zone is an important region for the dynamics of the Sun and the solar dynamo. In this region, the sound speed inferred by globa…
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…