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Exploring the Connection between Helioseismic Travel Time Anomalies and the Emergence of Large Active Regions during Solar Cycle 24
John Stefan, Alexander Kosovichev
We investigate deviations in the mean phase travel time of acoustic waves preceding the emergence of 46 large active regions observed by the Helioseismic and Magnetic Imager (HMI).…
Effects of Emerging Bipolar Magnetic Regions in Mean-field Dynamo Model of Solar Cycles 23 and 24
V. V. Pipin, A. G. Kosovichev, V. E. Tomin
We model the physical parameters of Solar Cycles 23 and 24 using a nonlinear dynamical mean-field dynamo model that includes the formation and evolution of bipolar magnetic regions…
Analysis and Modeling of High-Frequency Emission and Deep Seismic Sources of Sunquakes
John T. Stefan, Alexander G. Kosovichev
Recent work published by Lindsey et al find evidence for a deep and compact seismic source for the sunquake associated with the 2011 July 30 M9.3 flare, as well as seismic emission…
Implicit large eddy simulations of global solar convection: effects of numerical resolution in non-rotating and rotating cases
G. Guerrero, A. M. Stejko, A. G. Kosovichev +2
Simulating deep solar convection and its coupled mean-field motions is a formidable challenge where few observational results constrain models that suffer from the non-physical inf…
Spatial Scales and Time Variation of Solar Subsurface Convection
Alexander V. Getling, Alexander G. Kosovichev
Spectral analysis of the spatial structure of solar subphotospheric convection is carried out for subsurface flow maps constructed using the time--distance helioseismological techn…
Constraining Global Solar Models through Helioseismic Analysis
Andrey M. Stejko, Alexander G. Kosovichev, Nicholas A. Featherstone +4
Global hydrodynamic simulations of internal solar dynamics have focused on replicating the conditions for solar-like differential rotation and meridional circulation using the resu…