| A parameterized technique is developed for predicting the formation of the primary large-scale plasma structures of the storm-time mid- to high-latitude F-layer known as Density Structure Parameterization. It makes possible real-time and simultaneous specifications of the first order location, morphology, and intensity of storm-enhanced density, tongues of ionization, polar holes, and large-scale density troughs, using visual inspection of electric field potential patterns and solar terminator location as the sole predictive reference tools. The technique is based on studies using the Utah State University Time Dependent Ionospheric Model, including first-ever runs driven by Assimilative Mapping of Ionospheric Electrodynamics electric fields. Defense Meteorological Satellite Program data is used for validation. The storm study day is January 14, 1988.; Guided by first principles theory, we devise a plotting procedure of model output that demonstrates the physical processes key to ionospheric density simulations. The dominant processes are specified as parameters. Each parameter is subsequently associated with straightforward visual characteristics of electric field potential patterns and solar terminator location. Thus, the Density Structure Parameterization technique combines the simplicity of parameterization with physically meaningful information content from theory and numerical model results.; The technique is a valuable tool to increase scientific understanding. Of particular importance, it makes possible a spatially comprehensive and readily understandable visualization of physical processes occurring throughout the mid- to high-latitude F-layer. Thus, using the theoretical framework of the technique, we posit and substantiate the central role vertical E x B drift plays in the development of the many high-latitude, storm-time plasma density structures, including storm-enhanced density, tongues of ionization, and polar holes. We are also able to account for temporal and spatial variability in the appearance of these structures. The technique also provides a sufficient theoretical framework to allow standardized classification of large-scale plasma features. Additionally, we hypothesize the existence of new ionospheric density structures based on the concepts of the Density Structure Parameterization methodology. Finally, the technique shows utility as a research tool used when used in conjunction with in situ satellite density measurements, allowing critical assessment of morphological differences between independent modeled electric field potential patterns. |
