Gu X., Y. Y. Shprits, B. Ni, (2012), Parameterized lifetime of radiation belt electrons interacting with lower-band and upper-band oblique chorus waves, Geophysical Research Letters, 39, doi:10.1029/2012GL052519
Abstract
In order to evaluate the electron lifetimes from quasi-linear bounce-averaged diffusion coefficients, a large amount of CPU time is required to compute scattering rates. To reduce computation time, we assume that the electron loss rates are a function of L shell and electron energy, allowing us to derive the parameterization of electron lifetime using a linear regression technique. We also present the parameterizations of lifetimes as a function of electron energy and ratios of plasma frequency to electron gyrofrequency at a fixed L shell. By considering the net loss rates due to lower-band (0.05–0.5 |Ωce|) and upper-band (0.5–0.7 |Ωce|) chorus waves propagating obliquely with respect to the ambient magnetic field, the parameterizations of electron lifetime for energies between 1 keV and 2 MeV are investigated in the outer radiation belt. The parameterized lifetimes indicate a strong functional dependence on electron energy, L shell, and the level of geomagnetic activity (Kp index), and are also dependent on the ratios of plasma frequency to electron gyrofrequency. During the storm time, the lifetimes for higher energy ([more than]100 keV) electrons range from hours to days in the heart of the radiation belts. In contrast, the lifetimes for lower energy (Authors (sorted by name)
Gu Ni ShpritsJournal / Conference
Geophysical Research LettersAcknowledgments
This research was supported by NASA grants NNX09AF51G and NNX10AK996 and by the Lab Fees Research Program. BN acknowledges the support by NASA grant NNX12AD12G. We would like to thank the reviewers for valuable comments and suggestions.Grants
12-LR-235337 NNX09AF51G NNX10AK996 NNX12AD12GBibtex
@article{doi:10.1029/2012GL052519,
author = {Gu, Xudong and Shprits, Yuri Y. and Ni, Binbin},
title = {Parameterized lifetime of radiation belt electrons interacting with lower-band and upper-band oblique chorus waves},
year = {2012},
journal = {Geophysical Research Letters},
volume = {39},
number = {15},
pages = {},
keywords = {chorus waves, electron lifetime, lower band chorus, parameterization},
doi = {10.1029/2012GL052519},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2012GL052519},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2012GL052519},
abstract = {In order to evaluate the electron lifetimes from quasi-linear bounce-averaged diffusion coefficients, a large amount of CPU time is required to compute scattering rates. To reduce computation time, we assume that the electron loss rates are a function of L shell and electron energy, allowing us to derive the parameterization of electron lifetime using a linear regression technique. We also present the parameterizations of lifetimes as a function of electron energy and ratios of plasma frequency to electron gyrofrequency at a fixed L shell. By considering the net loss rates due to lower-band (0.05–0.5 |Ωce|) and upper-band (0.5–0.7 |Ωce|) chorus waves propagating obliquely with respect to the ambient magnetic field, the parameterizations of electron lifetime for energies between 1 keV and 2 MeV are investigated in the outer radiation belt. The parameterized lifetimes indicate a strong functional dependence on electron energy, L shell, and the level of geomagnetic activity (Kp index), and are also dependent on the ratios of plasma frequency to electron gyrofrequency. During the storm time, the lifetimes for higher energy ([more than]100 keV) electrons range from hours to days in the heart of the radiation belts. In contrast, the lifetimes for lower energy (}
}