ST3.7/AS4.54ST3.7/ AS4.54

Study of the middle and upper atmosphere irregularities to identify forcing mechanisms (co-organized) 
Convener: Lucilla Alfonsi  | Co-conveners: Elvira Astafyeva , Naomi Maruyama , Jøran I. Moen 
The study of the ionized and neutral atmosphere reveals to be an efficient diagnostic tool to understand the interaction among the geospheres and the impact of the solar wind on the Earth. Any variation from the expected behaviour can be helpful to identify various forcing mechanisms originated from below and above. The vertical coupling in the atmosphere involves the influence of the upper atmospheric layers on climate and the response of the ionosphere to the modification of neutral atmosphere chemistry and dynamics. An exacerbation in the space weather conditions, in turn, can cause changes in the neutral composition and in the electron density structuring. In addition, natural hazards, such as tsunami, earthquakes, thunderstorms can produce atmospheric acoustic gravity waves that result in electron density perturbations in the ionosphere.
The broad availability of instruments on board satellites and hosted at ground opens new opportunities of multi-disciplinary and multi-instruments collaboration to advance the current understanding in the field.
This session welcomes observational, theoretical, and modeling contributions on atmospheric irregularities to identify the coupling mechanisms within the atmosphere, between the atmosphere and the lithosphere, and between the atmosphere and the geospace.