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A Wave Model and Diffusion Coefficients for Plasmaspheric Hiss Parameterized by Plasmapause Location

Malaspina D. M., H. Zhu, A. Y. Drozdov, (2020), A Wave Model and Diffusion Coefficients for Plasmaspheric Hiss Parameterized by Plasmapause Location, J. of Geophys. Res. [Space Physics], 125, e2019JA027415, doi:10.1029/2019JA027415, e2019JA027415 10.1029/2019JA027415

Abstract

Abstract The scattering of electrons via plasmaspheric hiss whistler-mode plasma waves has profound consequences for the dynamics of electrons in the inner terrestrial magnetosphere, including the radiation belts. Consequently, simulations of inner magnetospheric electron dynamics incorporate hiss wave models, though these models are often parameterized by quantities convenient to describe particle populations (e.g., L shell). However, recent studies have revealed that the spatial distribution of plasmaspheric hiss wave power is only weakly dependent on L shell. Instead, it is dictated by the density structure of the plasmasphere (including radial extent and azimuthal structure). In this work, we create a plasmaspheric hiss wave model, and corresponding particle diffusion coefficients, parameterized by plasmapause location instead of L shell, in order to quantify the importance of including plasmapause organization of hiss waves for inner magnetosphere models. Noticeable differences in electron scattering lifetimes are found when comparing L shell parameterized hiss and plasmapause-parameterized hiss wave models on the timescales of days for 1 MeV electrons. Comparison of the lifetimes calculated from diffusion around the loss cone also show differences between L shell- and plasmapause-parameterized hiss models. This implies that plasmapause parameterization of hiss waves may be important for modeling specific geomagnetic events.

Authors (sorted by name)

Drozdov Malaspina Zhu

Journal / Conference

Journal Of Geophysical Research (Space Physics)

Grants

80NSSC18K1034

Bibtex

@article{doi:10.1029/2019JA027415,
author = {Malaspina, David M. and Zhu, Hui and Drozdov, Alexander Y.},
title = {A Wave Model and Diffusion Coefficients for Plasmaspheric Hiss Parameterized by Plasmapause Location},
journal = {Journal of Geophysical Research: Space Physics},
volume = {125},
number = {2},
pages = {e2019JA027415},
keywords = {radiation belts, simulation, plasmaspheric hiss, plasmasphere, wave model, wave parameterization},
doi = {10.1029/2019JA027415},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JA027415},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019JA027415},
note = {e2019JA027415 10.1029/2019JA027415},
abstract = {Abstract The scattering of electrons via plasmaspheric hiss whistler-mode plasma waves has profound consequences for the dynamics of electrons in the inner terrestrial magnetosphere, including the radiation belts. Consequently, simulations of inner magnetospheric electron dynamics incorporate hiss wave models, though these models are often parameterized by quantities convenient to describe particle populations (e.g., L shell). However, recent studies have revealed that the spatial distribution of plasmaspheric hiss wave power is only weakly dependent on L shell. Instead, it is dictated by the density structure of the plasmasphere (including radial extent and azimuthal structure). In this work, we create a plasmaspheric hiss wave model, and corresponding particle diffusion coefficients, parameterized by plasmapause location instead of L shell, in order to quantify the importance of including plasmapause organization of hiss waves for inner magnetosphere models. Noticeable differences in electron scattering lifetimes are found when comparing L shell parameterized hiss and plasmapause-parameterized hiss wave models on the timescales of days for 1 MeV electrons. Comparison of the lifetimes calculated from diffusion around the loss cone also show differences between L shell- and plasmapause-parameterized hiss models. This implies that plasmapause parameterization of hiss waves may be important for modeling specific geomagnetic events.},
year = {2020}
}