ST3.3Ionospheric Outflow From Earth and Other Terrestrial Planets - The Dynamic Ionosphere
|Convener: Massimo Materassi | Co-Conveners: Lukas Maes , Elena Kronberg , Stein Haaland , Manuel Hernandez-Pajares , Hans Nilsson|
On every terrestrial planet with an atmosphere, EUV radiation creates ions in the upper atmosphere that may flow upward. If the ions are energized enough, they can escape the gravitational potential. Depending on the presence and nature of the planetary magnetic field, there may be many similar or different mechanisms causing ionospheric outflow, and the final fate of these ions will be affected by this.
This session will investigate all the processes controlling ionospheric upflow and outflow, the fate of the ions as well as their effect on the dynamics of the (possibly induced) magnetosphere on Earth, Venus, and Mars.
The Earth’s ionosphere should be recognized and studied as a dynamical system with signatures of complexity: on the one hand, the system is robust in its overall configuration, with smooth space-time patterns of daily, seasonal and Solar Cycle variability; on the other hand, it shows a hierarchy of interactions among its sub-systems, yielding apparent unpredictability, space-time irregularity, turbulence.
The interplay of these two aspects leads both to the possibility of constructing realistic models of the average ionosphere, incorporating the increasing knowledge and predictability of high variability components; and to the difficulty of dealing with the worst cases of ionospheric disturbances.
This session is devoted to the presentation of studies addressing the description of the Earth's ionosphere as such a complex dynamical system, in which tools and techniques borrowed from the theory of classical and stochastic dynamics, information theory, signal processing, fluid dynamics and turbulence science are applied to the Earth’s ionosphere.
In particular, the session is dedicated, but not limited, to:
• irregularities and radio scintillation;
• Medium Scale Travelling Ionospheric Disturbances and geoeffective Solar Flare footprint (from GNSS and not only);
• ionospheric turbulence;
• non-linear time series analysis of ionospheric proxies;
• information theory and causality analysis of space-ionosphere connection;
• relationship between large scale and small scale space-time structures of the ionosphere;
• new data-driven models for different ionospheric variability phenomena.