10.18453/rosdok_id00005166 Vellalassery, Ashique Ashique Vellalassery http://d-nb.info/gnd/1392749670 https://orcid.org/0000-0002-8587-6153 Universität Rostock 2024 530 Physics 2024 en https://purl.uni-rostock.de/rosdok/id00005166 urn:nbn:de:gbv:28-rosdok_id00005166-6 Noctilucent clouds (NLCs) are ice particle clouds found 80-85 km above Earth's surface in the cold (~130K) summer mesopause region. Their formation requires extremely low temperatures and water vapour (H2O). NLCs are sensitive to temperature and water vapour levels, making them useful tracers for atmospheric conditions in this region. This thesis investigates the 11-year solar cycle's impact on NLCs, water vapor, and temperatures using model simulations, covering 170 years (1849–2019). Results show water vapour response to the solar cycle is altitude-dependent.