1. A NEW ASSIMILATIVE MODEL FOR INTERMEDIATE SCALE IONOSPHERIC STRUCTURE by Charles Rino, Charles Carrano, and Keith Groves URSI AT-RASC Gran Canaria May 19, 2015

2. For both modeling and data assimilation quasi-deterministic and stochastic elements must be considered The following representation of electron density explicitly identifies both components A standard approach assumes that is purely stochastic and characterized by a spectral density function Although the approach can accommodate field-aligned anisotropy there is nothing in the underlying physics that tells us how to make the partition. Moreover, there is nothing that constrains stochastic model to conform to the underlying physics Configuration-space models start with striations as elemental structure building blocks. Striations defined in magnetic coordinates by two profile functions Introduction

3. Model Realizations Summation of Fourier components Summation of Striations

4. Successive Bifurcation Successive Bifurcation Rule: The number of striations at any given level is twice the number of the next larger level Successive bifurcation provides a simple rule for generating a distribution of randomly located striation that will produce any desired power law for the size range. The scheme can be extended multi-component power laws.

5. Single Component Realization

6. Two Component Realization

7. Highly Disturbed C/NOSF Example Uniform spatial scale derived by interpolation of uniform time sampling 400 km altitude variation 1,349,950 samples at 14.03 m 12

8. Preliminary Data Model Comparisons

9. Summary and Conclusions We have shown that configuration space models can be constructed with a small set of defining parameters that reproduce the range of reported intermediate-scale spectral characteristics The model is efficient and consistent with the physics that cause structure formation Configuration space models effectively reintroduce the textural component of structure realizations, which is lost when spectral characteristics are imposed on white noise Configuration space models are well suited for planned high-latitude experiments that will use a configuration of Cubesats to make simultaneous space- time measurements.