HAO Colloquium - Jonathan Snively, Embry-Riddle Aeronautical University

Modeling of Acoustic and Gravity Wave Processes and Observables in the Ionosphere, Thermosphere, and Mesosphere

Acoustic and gravity waves with short periods (~few to 10s of minutes) and small scales (~10s to 100s of kilometers) are routinely observed in the Earth's ionosphere, thermosphere, and mesosphere (ITM) and are well-known to impose localized variability in addition to cumulative effects at larger scales. Waves within this part of the spectrum are generated by tropospheric convection and secondary forcing mechanisms, and as responses to impulsive forcing events. Signatures of their perturbations are readily measured in airglow and species layers (~80-100 km) and the bottomside F-region ionosphere (~150-250 km), providing insight into their sources, propagation, and impacts. Here, they are investigated using new versions of the 2D and 3D high-resolution, nonlinear, compressible, Model for Acoustic and Gravity wave Interactions and Coupling (MAGIC). Results include coupled responses of species densities, airglow layers, and the ionosphere to short-period wave processes, thus enabling comparisons with data. Modeling case studies elucidate scenarios of wave propagation, nonlinear evolutions, and effects within and outside the observable layers of the ITM. Details of the specific numerical methodology, plus recent results, are reviewed.

Date and time: 
Friday, October 12, 2018 - 2:00pm to 3:00pm
2139 - Capt. Mary