WORK BY ILIAUNI PROFESSOR TEIMURAZ ZAKARASHVILI PUBLISHED IN INFLUENTIAL SIENTIFIC JOURNAL NATURE PHYSICS
In influential scientific journal Nature Physics, scientific work called Alfvén wave dissipation in the solar chromosphere has been published by co-authorship of Ilia State University professor and researcher of Abastumani Astrophysical Observatory, Teimuraz Zakarashvili.
In the work, Ilia State University scientist, together with his British and American colleagues, first showed the observations of plasma wave dissipation in the solar atmosphere, which is a scientific breakthrough.
The sun has a great impact on the atmosphere of the earth and further scientific-technical development of our civilization. The temperature of the sun surface (photosphere) is several thousand degrees, while in the upper atmosphere (corona) it hits several million degrees. A plasma heating mechanism has been unknown so far, while one of the possible corona heating mechanisms envisage plasma Alfvén wave dissemination and dissipation. Study of Alfvén waves has been underway for half a century, however, their observation is rather complicated.
As a result of joint observations by Dunn Solar Telescope (USA), a unique vertical-axis solar telescope, and NASA Solar Dynamic Observatoryhas been made possible to directly observe Alfvén waves and the process of its dissipation in the solar chromosphere for the first time.
“The upper solar atmosphere plasma would grow cold without outer sources in a couple of hours, which is why Alfven wave observation is a real breakthrough in resolving the issue of heating the solar atmosphere,” maintains the study co-author Teimuraz Zakarashvili. “A raise in temperature when waves disseminate is most interesting since it directly indicates wave dissipation,” he adds.
S. T. D. Grant, D. B. Jess, T. V. Zaqarashvili, C. Beck, H. Socas-Navarro, M. J. Aschwanden, P. H. Keys, D. J. Christian, S. J. Houston, and R. L. Hewitt. Dissipation of Alfvén waves in the solar chromosphere. Nature Physics, 10.1038/s41567-018-0058-3, 2018
Associate professor at Ilia State University
Researcher at Abastumani Astrophysical Observatory