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Statistical properties of the radiation belt seed population

Boyd A. J., H. E. Spence, C. -. Huang, G. D. Reeves, D. N. Baker, D. L. Turner, S. G. Claudepierre, J. F. Fennell, J. B. Blake, Y. Y. Shprits, (2016), Statistical properties of the radiation belt seed population, J. of Geophys. Res. [Space Physics], 121, 7636-7646, doi:10.1002/2016JA022652

Abstract

Abstract We present a statistical analysis of phase space density data from the first 26 months of the Van Allen Probes mission. In particular, we investigate the relationship between the tens and hundreds of keV seed electrons and >1 MeV core radiation belt electron population. Using a cross-correlation analysis, we find that the seed and core populations are well correlated with a coefficient of ≈0.73 with a time lag of 10–15 h. We present evidence of a seed population threshold that is necessary for subsequent acceleration. The depth of penetration of the seed population determines the inner boundary of the acceleration process. However, we show that an enhanced seed population alone is not enough to produce acceleration in the higher energies, implying that the seed population of hundreds of keV electrons is only one of several conditions required for MeV electron radiation belt acceleration.

Authors (sorted by name)

Baker Blake Reeves Shprits Spence Turner

Journal / Conference

Journal Of Geophysical Research (Space Physics)

Acknowledgments

This work was supported by RBSP‐ECT funding provided by JHU/APL contract 967399 under NASA's Prime contract NAS5‐01072. RBSP‐ECT data are available at http://www.rbsp‐ect.lanl.gov. EMFISIS data are available at http://emfisis.physics.uiowa.edu.

Grants

967399 NAS5‐01072

Bibtex

@article{doi:10.1002/2016JA022652,
author = {Boyd, A. J. and Spence, H. E. and Huang, C.-L. and Reeves, G. D. and Baker, D. N. and Turner, D. L. and Claudepierre, S. G. and Fennell, J. F. and Blake, J. B. and Shprits, Y. Y.},
title = {Statistical properties of the radiation belt seed population},
year={2016},
journal = {Journal of Geophysical Research: Space Physics},
volume = {121},
number = {8},
pages = {7636-7646},
keywords = {radiation belt, seed population, phase space density},
doi = {10.1002/2016JA022652},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2016JA022652},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2016JA022652},
abstract = {Abstract We present a statistical analysis of phase space density data from the first 26 months of the Van Allen Probes mission. In particular, we investigate the relationship between the tens and hundreds of keV seed electrons and >1 MeV core radiation belt electron population. Using a cross-correlation analysis, we find that the seed and core populations are well correlated with a coefficient of ≈0.73 with a time lag of 10–15 h. We present evidence of a seed population threshold that is necessary for subsequent acceleration. The depth of penetration of the seed population determines the inner boundary of the acceleration process. However, we show that an enhanced seed population alone is not enough to produce acceleration in the higher energies, implying that the seed population of hundreds of keV electrons is only one of several conditions required for MeV electron radiation belt acceleration.}
}