Prefrontal squall lines are mesoscale convective systems that often cannot be linked to any preexisting organizing mechanism. This suggests the possibility that they are self-forced disturbances, driven by a cooperative interaction between convective and larger scales. To investigate this hypothesis, a wave-CISK model is developed for two-dimensional disturbances in a baroclinic basic state wit...

The interactive dynamics involving convective motions in a layer heated from below and internal wave motions in a contiguous, stably stratified layer is analyzed in the weakly nonlinear limit. A reduced dynamical system consisting of three coupled, nonlinear amplitude equations describing the intensity of convection co-existing with bi-directionally propagating long internal waves is derived. T...

We present a detailed bifurcation scenario of zero-Prandtl number Rayleigh-Bénard convection using direct numerical simulations (DNS) and a 27-mode low-dimensional model containing the most energetic modes of DNS. The bifurcation analysis reveals a rich variety of convective flow patterns and chaotic solutions, some of which are common to that of the 13-mode model of Pal et al. [EPL 87, 54003 (...

V. P. Karasyov, P. V. Kovalev, A. Z. Issagulov, V. Yu. Kulikov, Y. P. Chsherbakova. Saint-Petersburg State Polytechnic University, SaintPetersburg, Russia, Karaganda State Technical University, Karaganda, Kazakhstan There is considered the power operating mode of a high-power arc steelmaking furnaces (ASMF) in the period of the flat bath. It is revealed that electric energy is mainly spent for ...

The calculated intermediate and high degree p-mode frequencies of standard solar models show greater disagreement with the observations than low degree modes. This leads to the conclusion that the subatmospheric structure of the models has to be improved. We are presenting solar models with up-to-date input physics and controlled numerical accuracy of 10 5. For the outer boundary condition we u...

A paradigm for Hall discharge modeling is presented whereby only the time scale of the lowest-frequency mode is explicitly resolved. The ability of such a low-frequency model to reproduce with excellent accuracy the breathing mode is demonstrated through comparisons with a fully time-dependent numerical model. Based on this formalism, an approximate linearized model is derived which essentially...

Global gyrokinetic toroidal code (GTC) is used to study the low-frequency modes in tokamaks including geodesic acoustic mode (GAM) and beta-induced Alfvén eigenmode (BAE). GAM and BAE have the same frequency due to the geodesic curvature and thermal particle compressibility in toroidal plasmas. Important new insights include: the collisionless damping rate of the GAM is greatly enhanced by trap...

Vicarious calibration using different types of land surface and deep convective clouds is considered as a mode to monitor the sensor performance. Snow cover as the brightest and in many cases spatially uniform surface has a significant potential as a calibration target. Proposed in this presentation approach is based on the creation and implementation of analytical bidirectional reflectance dis...

A simple model to study interacting instabilities and textures of resulting patterns for thermal convection is presented. The model consisting of twelve-mode dynamical system derived for periodic square lattice describes convective patterns in the form of stripes and patchwork quilt. The interaction between stationary zig-zag stripes and standing patchwork quilt pattern leads to spatiotemporal ...