დოქტორანტის სახელი და გვარი: მარიამ ალბექიონი
ფაკულტეტი: საბუნებისმეტყველო მეცნიერებებისა და მედიცინის ფაკულტეტი
ხელმძღვანელი ილიაუნი: ვასილ კუხიანიძე
ხელმძღვანელი გოტინგენი: ლორან ჟიზონი

Rossby waves (also known as planetary waves and r-modes), arise due to latitudinal variation of Coriollis parameter and they govern the large scale dynamics of the Earth’s atmosphere and oceans. Rossby waves are generally propagate in the opposite direction of rotation and hence are retrograde with regards to the rotating sphere. Rossby waves can also play an important role in large scale dynamics of the solar atmosphere and interior. For example, Rossby waves may govern the dynamics of upper convection zone and internal layers of the Sun.

Rossby waves have been suggested to explain observed mid-range periodicities in solar activity. Recent observational evidence of Rossby waves in the dynamics of coronal bright points and subphotospheric layers (Löptien et al. 2018) significantly increase the interest towards the waves in the solar context. Namely, Löptien et al. (2018) found a transition from turbulence-like to wave-like dynamics around certain wavenumbers, which might explain the deficit of kinetic energy of convection at large spatial scales.

The main goal of the doctoral thesis is to study the dynamics of large-scale Rossby waves in the conditions of the solar internal layers, their stability and the interaction with solar convection. For achieving this goal we will use analytical and numerical methods. Analytical methods include solving shallow-water HD and MHD equations in the presence of solar latitudinal rotation. Numerical code will be used to model interaction of global Rossby waves with rotating convection in rotating convection zone. Also, stability of the Rossby modes will be studied analytically and numerically.

სამეცნიერო სტატიები:

• Albekioni, M., V. Zaqarashvili, and V. Kukhianidze. “Rossby waves on stellar equatorial beta-planes: uniformly rotating radiative stars.” arXiv preprint arXiv:2301.07446 (2023)
• Rossby Waves in Astrophysics T.V. Zaqarashvili, Albekioni, J.L. Ballester, Y. Bekki4,L. Biancofiore, A.C. Birch, M. Dikpati, L. Gizon, E. Gurgenashvili, E. Heifetz, A.F. Lanza, S.W. McIntosh, L. Ofman, R. Oliver, B. Proxauf, O.M. Umurhan, R. Yellin-Bergovoy. Space Sci Rev (2021) 217:15
• Gizon, Laurent, Damien Fournier, and Albekioni. “Effect of latitudinal differential rotation on solar Rossby waves: Critical layers, eigenfunctions, and momentum fluxes in the equatorial β plane.” Astronomy & Astrophysics642 (2020): A178.
• Zaqarashvili, T. V., Albekioni, J. L. Ballester, Y. Bekki, Luca Biancofiore, A. C. Birch, M. Dikpati et al. “Rossby waves in astrophysics.” Space Science Reviews 217 (2021): 1-93.