A5000028680- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Astrophysics and Star Formation Studies
- Coastal and Marine Dynamics
- Fluid Dynamics Simulations and Interactions
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Fluid dynamics and aerodynamics studies
- Aeolian processes and effects
Tel Aviv University
2016-2021
Abstract Rossby waves are a pervasive feature of the large-scale motions Earth’s atmosphere and oceans. These (also known as planetary r-modes) also play an important role in dynamics different astrophysical objects such solar interior, discs, rapidly rotating stars, exoplanetary atmospheres. This paper provides review theoretical observational aspects on spatial temporal scales various settings. The physical played by Rossby-type associated instabilities is discussed context stellar...
When will a new cycle's sunspots appear? We demonstrate novel physical mechanism, namely, that "solar tsunami" occurring in the Sun's interior shear-fluid layer can trigger magnetic flux emergence at high latitudes, few weeks after cessation of old near equator. This tsunami is excited equator when dams, created by oppositely-directed toroidal field North and South hemispheres, break due to mutual annihilation there. The fluid supported these dams rushes equator; surplus cannot be contained...
The dynamical response of edge waves under the influence self-gravity is examined in an idealized two-dimensional model a proto-stellar disc, characterized steady state as rotating vertically infinite cylinder fluid with constant density except for single interface at some radius r0. basic prescribed to rotate Keplerian profile $\Omega_k(r)\sim r^{-3/2}$ modified by additional azimuthal sheared flow. A linear analysis shows that there are two azimuthally propagating waves, kin familiar...
A linear stability analysis on the dynamics of azimuthally symmetric swirling flows and emergence steady rotating polygons is presented. The different behaviors system are discussed as an interaction between horizontal inner centrifugal edge waves outer vertical gravity waves.
The vertical shear instability is an axisymmetric effect suggested to drive turbulence in the magnetically inactive zones of protoplanetary accretion disks. Here we examine its physical mechanism analytically tractable "minimal models" three settings that include a uniform density fluid, stratified atmosphere, and shearing-box section disk. Each these analyses show instability's essence similar slantwise convective symmetric mid-latitude Earth presence baroclinic jet stream, as well mixing...
We present an explicit analysis of wave-resonant instability swirling flows inside fast rotating cylindrical containers. The linear dynamics are decomposed into the interaction between horizontal inner centrifugal edge waves, outer vertical gravity waves with aim understanding waves. show how far field velocity induced respectively by and affect each other's propagation rates amplitude growth. follow this in terms a four wave interaction, two ones, explain why resonant can be obtained only...