TY - CONF

T1 - New Features for the Empirical Canadian High Arctic Ionospheric Model (E-CHAIM) v4.0.0

AU - Themens, David

AU - Watson, Christopher A.

AU - Rogers, Neil

AU - Reid, Benjamin

AU - McCaffrey, Anthony

AU - Jayachandran, Periyadan T.

AU - Honary, Farideh

AU - Elvidge, Sean

AU - Ruck, Joshua

PY - 2022/12/16

Y1 - 2022/12/16

N2 - The Empirical Canadian High Arctic Ionospheric Model (E-CHAIM) is a 3D empirical model of the high latitude electron density designed as an alternative to the use of the International Reference Ionosphere (IRI) at high latitudes. The model was initially developed through Themens et al. [2017, 2018, and 2019] with climatological representations of the F2 peak, topside, and bottomside ionosphere, respectively. The model also includes a storm peak density model to accommodate the high latitude negative ionospheric response to storm-driven changes in thermospheric composition. Since the initial release of the model, auroral electron precipitation was added in v3.1 to account for enhancements in the auroral E-Region [Watson et al., 2021] and a climatological D-Region was added in v3.2 through the integration of the Faraday IRI-2018 [Friedrich and Torkar, 2018]. Here we will discuss the inclusion of solar energetic proton precipitation in the model and compare the resulting electron density enhancements with corresponding increases in riometer absorption and the electron density structures observed through Incoherent Scatter Radar (ISR). We will also conduct a validations of the performance of the auroral electron precipitation module.References:Friedrich, M., C. Pock, and K. Torkar (2018). FIRI-2018, an updated empirical model of the lower ionosphere. Journal of Geophysical Research: Space Physics, 123, 6737– 6751. https://doi.org/10.1029/2018JA025437Themens, D.R., P.T. Jayachandran, A.M. McCaffrey, B. Reid, and R.H. Varney (2019). A bottomside parameterization for the Empirical Canadian High Artic Ionospheric Model (E-CHAIM), Radio Sci., doi: 10.1029/2018RS006748Themens, D.R., et al. (2018). Topside Electron Density Representations for Middle and High Latitudes: A Topside Parameterization for E-CHAIM based on the NeQuick, J. Geophys. Res. Space Physics, 123, doi: 10.1002/2017JA024817Themens, D.R., P.T. Jayachandran, I. Galkin, and C. Hall (2017). The Empirical Canadian High Arctic Ionospheric Model (E-CHAIM): NmF2 and hmF2, J. Geophys. Res. Space Physics, doi: 10.1002/2017JA024398Watson, C., D.R. Themens, and P.T. Jayachandran (2021), Development and validation of precipitation enhanced densities for E-CHAIM, Space Weather, doi:10.1029/2021SW002779

AB - The Empirical Canadian High Arctic Ionospheric Model (E-CHAIM) is a 3D empirical model of the high latitude electron density designed as an alternative to the use of the International Reference Ionosphere (IRI) at high latitudes. The model was initially developed through Themens et al. [2017, 2018, and 2019] with climatological representations of the F2 peak, topside, and bottomside ionosphere, respectively. The model also includes a storm peak density model to accommodate the high latitude negative ionospheric response to storm-driven changes in thermospheric composition. Since the initial release of the model, auroral electron precipitation was added in v3.1 to account for enhancements in the auroral E-Region [Watson et al., 2021] and a climatological D-Region was added in v3.2 through the integration of the Faraday IRI-2018 [Friedrich and Torkar, 2018]. Here we will discuss the inclusion of solar energetic proton precipitation in the model and compare the resulting electron density enhancements with corresponding increases in riometer absorption and the electron density structures observed through Incoherent Scatter Radar (ISR). We will also conduct a validations of the performance of the auroral electron precipitation module.References:Friedrich, M., C. Pock, and K. Torkar (2018). FIRI-2018, an updated empirical model of the lower ionosphere. Journal of Geophysical Research: Space Physics, 123, 6737– 6751. https://doi.org/10.1029/2018JA025437Themens, D.R., P.T. Jayachandran, A.M. McCaffrey, B. Reid, and R.H. Varney (2019). A bottomside parameterization for the Empirical Canadian High Artic Ionospheric Model (E-CHAIM), Radio Sci., doi: 10.1029/2018RS006748Themens, D.R., et al. (2018). Topside Electron Density Representations for Middle and High Latitudes: A Topside Parameterization for E-CHAIM based on the NeQuick, J. Geophys. Res. Space Physics, 123, doi: 10.1002/2017JA024817Themens, D.R., P.T. Jayachandran, I. Galkin, and C. Hall (2017). The Empirical Canadian High Arctic Ionospheric Model (E-CHAIM): NmF2 and hmF2, J. Geophys. Res. Space Physics, doi: 10.1002/2017JA024398Watson, C., D.R. Themens, and P.T. Jayachandran (2021), Development and validation of precipitation enhanced densities for E-CHAIM, Space Weather, doi:10.1029/2021SW002779

KW - ionosphere

KW - Solar Energetic Particles

KW - aurora

M3 - Abstract

T2 - AGU Fall Meeting 2022

Y2 - 12 December 2022 through 16 December 2022

ER -