Master of science Tinna Lif Gunnarsdottir will Wednesday November 15th, 2023, at 12:15 hold her disputas for the PhD degree in Science. The title of her thesis is:
"Mesospheric Dust – radar applications for detection and investigation"
Summary:
Large amounts of meteoric particles ablate globally into the Earth’s atmosphere each day, and they interact with the atmosphere through several processes in the mesosphere and below. These processes include dust charging, where dust is expected to influence the charge balance in the D-region of the ionosphere. Consequently, the charged dust particles can influence the incoherent scatter that is observed from the ionospheric plasma with radar. Dust also plays a role in the formation of ice particles, and charge interactions of these ice particles take part in a process that forms coherent radar echoes called Polar Mesospheric Summer Echoes (PMSEs). Therefore, radar investigations offer the possibility to investigate the dust and its interactions. Based on observations with the EISCAT VHF radar, this thesis deals with different radar methods and their possibilities to examine dust particles throughout the year, both looking at dust signatures in incoherent scatter signals as well as dust encased in ice in the cold summer mesosphere and its influence on PMSEs.
Evaluation Committee
- Docent Dr. Linda Magner, Meteorological Institute, Stockholm University, Sweden (1. Opponent)
- Professor Noora Partamies, UNIS, Svalbard (2. Opponent)
- Professor Unni Pia Løvhaug, Department of Physics and Technology, UiT (intern member and leader of the committee)
The Disputas will be led by Professor Peik Haugen, head of the department of Chemistry at the faculty of Science and Technology at UiT.
Supervisors
- Professor Ingrid Mann, Department of Physics and Technology, UiT (main supervisor)
- Professor Rune Graversen, Department of Physics and Technology, UiT
- Professor Wojciecs Miloch, Department of Physics, UiO
Streaming site
The disputas and trial lecture will be streamed from these sites:
Thesis
The thesis is available through
Munin.