Senior researchers of Abastumani Astrophysical Observatory: Vasil Kukhianidze, Teimuraz Zaqarashvili, George Ramishvili and Bidzina Shergelashvili have won the Collaborative Research Project:
Instability of magnetized jets in the solar atmosphere
Vasil Kukhianidze, Teimuraz Zaqarashvili
Heating of chromospheric/coronal plasma is still an unsolved problem in solar physics. Recently observed various magnetized jets may play significant role in the solution of the heating problem. These jets can be unstable to Kelvin-Helmholtz (KH) instability due to axial/azimuthal motions and to kink instability due to the magnetic twist. These instabilities may heat the ambient plasma and may destabilize prominences leading to Coronal Mass Ejections (CMEs).
The project will study KH and kink instabilities in solar twisted magnetized jets by theoretical and observational methods. Observations from Solar Dynamic Observatory and Swedish Solar Telescope (La Palma) will be used to study the instability of solar tornadoes and non-thermal broadening of chromospheric spectral lines (Hα and Ca II), respectively. The analytical and observational results will be verified numerically by performing large-scale, parallel numerical simulations.
Expected outcomes of the project will exert a tremendous influence on a further development of solar physics. KHI instability in partially ionized chromospheric jets (type II spicules, RBEs/RREs) may lead to their fast heating due to ion-neutral collisions and can explain observed fast disappearance of these structures in chromospheric spectral lines. This may appear as a clue for long-standing chromospheric heating problem. Kink instability of twisted jets may trigger secondary instabilities, formation of current sheets and consecutive energy release/heating of ambient plasma. The instability of tornadoes may destabilize prominences and trigger CMEs. Statistical relation of tornadoes and unstable prominences may lead to significant improvement of CME predictions and to further development of solar and space weather predictions.
Principal Investigator (compatriot): David Tsiklauri
Principal Investigator (local): Vasil Kukhianidze
Project Coordinator: Teimuraz Zaqarashvili
Key participant personnel: Irakli Mghebrishvili, Sergo Lomineishvili, Tamar Chagiashvili
Theoretical statistical modeling of the flow patterns in the solar atmosphere
George Ramishvili, Bidzina Shergelashvili
The solar and stellar surroundings host enormous number small (e.g. spicules, coronal jets), medium (e.g. in prominences, tornado type flows, flaring sites) and large (such as slow and fast wind patterns, Co-rotating Interaction Regions (CIRs), Coronal Mass Ejections (CMEs)) scale flow patterns. The proper understanding of the fundamental physical ground responsible for the formation of such structured solar (stellar) atmospheres and interplanetary flow configurations requires sturdies from both observational and analytical points of view. In this project we primarily address the fundamental analytical modeling of the adiabatic and driven solar flow patterns with their optical and radio observational implications. The results of the project correspond to ESA and NASA based global space weather awareness system, that are extremely important trend of services for protection of the multibillion ground and space based technological and life supporting assets in navigation, communication, energetic, public health and many other socio-economic branches potentially vulnerable for the influence from the space weather conditions on Earth and its surroundings.
Principal Investigator (compatriot): Alexander Taktakishvili
Principal Investigator (local):George Ramishvili
Project Coordinator: Bidzina Shergelashvili
Key participant personnel: Bagashvili Salome, Dididze Grigol, Dumbadze Gulsun, Philishvili Elena