Search Results - "Kosovichev, A."

BIPOLAR MAGNETIC REGIONS ON THE SUN: GLOBAL ANALYSIS OF THE SOHO/MDI DATA SET by STENFLO, J. O, KOSOVICHEV, A. G

“…The magnetic flux that is generated by dynamo processes inside the Sun emerges in the form of bipolar magnetic regions. The properties of these directly…”
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On the Origin of Solar Torsional Oscillations and Extended Solar Cycle by Pipin, V. V., Kosovichev, A. G.

“…We present a nonlinear mean-field model of the solar interior dynamics and dynamo, which reproduces the observed cyclic variations of the global magnetic field…”
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Effects of Emerging Bipolar Magnetic Regions in Mean-field Dynamo Model of Solar Cycles 23 and 24 by Pipin, V. V., Kosovichev, A. G., Tomin, V. E.

“…Abstract We model the physical parameters of Solar Cycles 23 and 24 using a nonlinear dynamical mean-field dynamo model that includes the formation and…”
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DIFFERENTIAL ROTATION IN SOLAR-LIKE STARS FROM GLOBAL SIMULATIONS by Guerrero, G, SMOLARKIEWICZ, P K, Kosovichev, A G, Mansour, N N

“…To explore the physics of large-scale flows in solar-like stars, we perform three-dimensional anelastic simulations of rotating convection for global models…”
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The Helioseismic and Magnetic Imager (HMI) Investigation for the Solar Dynamics Observatory (SDO) by Scherrer, P. H., Schou, J., Bush, R. I., Kosovichev, A. G., Bogart, R. S., Hoeksema, J. T., Liu, Y., Duvall, T. L., Zhao, J., Title, A. M., Schrijver, C. J., Tarbell, T. D., Tomczyk, S.

“…The Helioseismic and Magnetic Imager (HMI) instrument and investigation as a part of the NASA Solar Dynamics Observatory (SDO) is designed to study…”
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ON THE ROLE OF TACHOCLINES IN SOLAR AND STELLAR DYNAMOS by Guerrero, G., Smolarkiewicz, P. K., de Gouveia Dal Pino, E. M., Kosovichev, A. G., Mansour, N. N.

“…ABSTRACT Rotational shear layers at the boundary between radiative and convective zones, tachoclines, play a key role in the process of magnetic field…”
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What Sets the Magnetic Field Strength and Cycle Period in Solar-type Stars? by Guerrero, G., Zaire, B., Smolarkiewicz, P. K., de Gouveia Dal Pino, E. M., Kosovichev, A. G., Mansour, N. N.

“…Two fundamental properties of stellar magnetic fields have been determined by observations for solar-like stars with different Rossby numbers ( ), namely, the…”
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Leptocline as a shallow substructure of near-surface shear layer in 3D radiative hydrodynamic simulations by Kitiashvili, Irina N, Kosovichev, A G, Wray, A A, Sadykov, V M, Guerrero, G

“…ABSTRACT Understanding the effects driven by rotation in the solar convection zone is essential for many problems related to solar activity, such as the…”
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On the Origin of the Double-cell Meridional Circulation in the Solar Convection Zone by Pipin, V. V., Kosovichev, A. G.

“…Recent advances in helioseismology, numerical simulations and mean-field theory of solar differential rotation have shown that the meridional circulation…”
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Does Nonaxisymmetric Dynamo Operate in the Sun? by Pipin, V. V., Kosovichev, A. G.

“…We explore effects of random nonaxisymmetric perturbations of kinetic helicity (the effect) and diffusive decay of bipolar magnetic regions on generation and…”
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HIGH RESOLUTION OBSERVATIONS OF CHROMOSPHERIC JETS IN SUNSPOT UMBRA by YURCHYSHYN, V, Abramenko, V, Kosovichev, A, Goode, P

“…Recent observations of a sunspot's umbra have suggested that it may be finely structured on a subarcsecond scale representing a mix of hot and cool plasma…”
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Implicit Large-eddy Simulations of Global Solar Convection: Effects of Numerical Resolution in Nonrotating and Rotating Cases by Guerrero, G., Stejko, A. M., Kosovichev, A. G., Smolarkiewicz, P. K., Strugarek, A.

“…Abstract Simulating deep solar convection and its coupled mean-field motions is a formidable challenge where few observational results constrain models that…”
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Influence of stellar radiation pressure on flow structure in the envelope of hot-Jupiter HD 209458b by Cherenkov, A A, Bisikalo, D V, Kosovichev, A G

“…Abstract Close-in exoplanets are subjected to extreme radiation of their host stars. Photometric observations of the hot-Jupiter HD 209458b transit by HST/STIS…”
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The Asymmetry of Sunspot Cycles and Waldmeier Relations as a Result of Nonlinear Surface-shear Shaped Dynamo by Pipin, V. V, Kosovichev, A. G

“…The paper presents a study of a solar dynamo model operating in the bulk of the convection zone with the toroidal magnetic field flux concentrated in the…”
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EFFECTS OF LARGE-SCALE NON-AXISYMMETRIC PERTURBATIONS IN THE MEAN-FIELD SOLAR DYNAMO by Pipin, V. V., Kosovichev, A. G.

“…ABSTRACT We explore the response of a nonlinear non-axisymmetric mean-field solar dynamo model to shallow non-axisymmetric perturbations. After a relaxation…”
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DEPENDENCE OF STELLAR MAGNETIC ACTIVITY CYCLES ON ROTATIONAL PERIOD IN A NONLINEAR SOLAR-TYPE DYNAMO by Pipin, V. V., Kosovichev, A. G.

“…ABSTRACT We study the turbulent generation of large-scale magnetic fields using nonlinear dynamo models for solar-type stars in the range of rotational periods…”
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Numerical Convergence of 2D Solar Convection in Implicit Large-eddy Simulations by Nogueira, H. D., Guerrero, G., Smolarkiewicz, P. K., Kosovichev, A. G.

“…Abstract Large-eddy simulations (LES) and implicit LES (ILES) are wise and affordable alternatives to the unfeasible direct numerical simulations of turbulent…”
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ENERGY RELEASE AND INITIATION OF A SUNQUAKE IN A C-CLASS FLARE by Sharykin, I. N., Kosovichev, A. G., Zimovets, I. V.

“…ABSTRACT We present an analysis of the C7.0 solar flare from 2013 February 17, revealing a strong helioseismic response (sunquake) caused by a compact impact…”
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Application of Data Assimilation Method for Predicting Solar Cycles by Kitiashvili, I, Kosovichev, A. G

“…Despite the known general properties of the solar cycles, a reliable forecast of the 11 yr sunspot number variations is still a problem. The difficulties are…”
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Photospheric and Subphotospheric Dynamics of Emerging Magnetic Flux by Kosovichev, A. G.

“…Magnetic fields emerging from the Sun’s interior carry information about physical processes of magnetic field generation and transport in the convection zone…”
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