51 citations · 336 across the 10 of their papers we have counts for
10 papers
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…
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…
Effects of Solar Active Regions on Meridional Flows
Michal Svanda, Alexander G. Kosovichev, Junwei Zhao
The aim of this paper is to extend our previous study of the solar-cycle variations of the meridional flows and to investigate their latitudinal and longitudinal structure in the s…
Validating Time-Distance Far-side Imaging of Solar Active Regions through Numerical Simulations
Thomas Hartlep, Junwei Zhao, Nagi N. Mansour +1
Far-side images of solar active regions have become one of the routine products of helioseismic observations, and are of importance for space weather forecasting by allowing the de…
Influence of Non-Uniform Distribution of Acoustic Wavefield Strength on Time-Distance Helioseismology Measurements
Konstantin V. Parchevsky, Junwei Zhao, Alexander G. Kosovichev
By analyzing numerically simulated solar oscillation data, we study the influence of non-uniform distribution of acoustic wave amplitude, acoustic source strength, and perturbation…
Speed of Meridional Flows and Magnetic Flux Transport on the Sun
M. Svanda, A. G. Kosovichev, J. Zhao
We use the magnetic butterfly diagram to determine the speed of the magnetic flux transport on the solar surface towards the poles. The manifestation of the flux transport is clear…