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Controlling effect of the pitch angle scattering rates near the edge of the loss cone on electron lifetimes

Shprits Y. Y., W. Li, R. M. Thorne, (2006), Controlling effect of the pitch angle scattering rates near the edge of the loss cone on electron lifetimes, J. of Geophys. Res. [Space Physics], 111, doi:10.1029/2006JA011758

Abstract

Intense interest currently exists in quantification of the loss of relativistic electrons in the outer radiation belts. Using diffusion coefficients computed for parallel propagating chorus waves, the evolution of the electron pitch angle distribution is examined. Sensitivity numerical experiments show that electron lifetimes are most sensitive to the value of the pitch angle scattering rate near the edge of the loss cone. When the scattering rates do not drop by more than an order of magnitude of the value near the edge of the loss cone for a 30 degree range of pitch angles, we find that the pitch angle distribution reaches an equilibrium shape within hours of the simulations and then decays exponentially with the same rate at all equatorial pitch angles. Implications of the results for combined scattering by EMIC and chorus or hiss waves are discussed as well as implications for future modeling and comparison with observations.

Authors (sorted by name)

Li Shprits Thorne

Journal / Conference

Journal Of Geophysical Research (Space Physics)

Acknowledgments

This research was supported by the NASA LWS grants NNX06AB84G and NNG04GN44G and NSF GEM grant ATM‐0603191.

Grants

ATM‐0603191 NNG04GN44G NNX06AB84G

Bibtex

@article{doi:10.1029/2006JA011758,
author = {Shprits, Y. Y. and Li, W. and Thorne, R. M.},
title = {Controlling effect of the pitch angle scattering rates near the edge of the loss cone on electron lifetimes},
journal = {Journal of Geophysical Research: Space Physics},
volume = {111},
year = {2006},
number = {A12},
pages = {},
keywords = {chorus waves, radiation belts, wave-particle interaction},
doi = {10.1029/2006JA011758},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2006JA011758},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2006JA011758},
abstract = {Intense interest currently exists in quantification of the loss of relativistic electrons in the outer radiation belts. Using diffusion coefficients computed for parallel propagating chorus waves, the evolution of the electron pitch angle distribution is examined. Sensitivity numerical experiments show that electron lifetimes are most sensitive to the value of the pitch angle scattering rate near the edge of the loss cone. When the scattering rates do not drop by more than an order of magnitude of the value near the edge of the loss cone for a 30 degree range of pitch angles, we find that the pitch angle distribution reaches an equilibrium shape within hours of the simulations and then decays exponentially with the same rate at all equatorial pitch angles. Implications of the results for combined scattering by EMIC and chorus or hiss waves are discussed as well as implications for future modeling and comparison with observations.}
}