A three-dimensional stochastic structure model derived from high-resolution isolated equatorial plasma bubble simulations

Abstract

Ionospheric structure is characterized by the space–time variation of electron density. However, our understanding of the physical processes that initiate and sustain intermediate-scale structure development does not relate directly to statistical measures that characterize the structure. Consequently, high-resolution physics-based equatorial plasma bubble simulations are essential for identifying systematic relations between statistical structure measures and the underlying physics that initiates and sustains the structure evolution. An earlier paper summarized the analysis of simulated equatorial plasma bubble (EPB) structure initiated with a quasi-periodic bottom-side perturbation that generated five plasma bubbles. The results are representative of real environments. However, the association of the structure development with individual EPBs was difficult to ascertain. This paper summarizes the analysis of new results from single isolated EPB realizations with varying parameters that affect the structure development. The evolution of the single isolated EPB realizations reveal what we have identified as a canonical structure evolution pattern manifest in the space–time development of four quantitative spectral parameters. The onset of structure occurs when the plasma bubble penetrates the F-region peak. The parameter evolution from the initiation point have a fish-like appearance. The three-dimensional structure model can be used to interpret in situ and remote diagnostic measurements as well as predicting the deleterious effects of propagation disturbances on satellite communication, navigation, and surveillance systems. Graphical Abstract

Can Numerical Simulations of Equatorial Plasma Bubble Plume Structures be Simplified for Operational and Practical Usage?

“…This approach has been previously utilized in the context of scintillation due to ionospheric irregularities inside EPBs along radio occultation ray paths, but with the use of a simple Gaussian-shaped spatial envelope representing the EPB plume (Carrano et al, 2011;Ludwig-Barbossa et al, 2023). In such cases, one would have "direction-dependent" C L k values that are highly sensitive to the precise geometrical orientation of the LOS to GNSS satellites and how they intersect the EPB plumes, thus emulating major factors governing the nonstationarity and directional dependence of low-latitude scintillations (Anderson & Strauss, 2005;Abadi et al, 2014;Rino et al, 2023). The formulation and construction of such a spatiotemporally varying C k suitable for this purpose will be the subject of future work.…”