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Fast injection of the relativistic electrons into the inner zone and the formation of the split-zone structure during the Bastille Day storm in July 2000

Kim K., Y. Y. Shprits, J. B. Blake, (2016), Fast injection of the relativistic electrons into the inner zone and the formation of the split-zone structure during the Bastille Day storm in July 2000, J. of Geophys. Res. [Space Physics], 121, 8329-8342, doi:10.1002/2015JA022072

Abstract

Abstract During the July 2000 geomagnetic storm, known as the Bastille Day storm, Solar, Anomalous, and Magnetospheric Particle Explorer (SAMPEX)/Heavy Ion Large Telescope (HILT) observed a strong injection of ~1 MeV electrons into the slot region (L ~ 2.5) during the storm main phase. Then, during the following month, electrons were clearly seen diffusing inward down to L = 2 and forming a pronounced split structure encompassing a narrow, newly formed slot region around L = 3. SAMPEX observations are first compared with electron and proton observations on HEO-3 and NOAA-15 to validate that the observed unusual dynamics was not caused by proton contamination of the SAMPEX instrument. The time-dependent 3-D Versatile Electron Radiation Belt (VERB) simulation of 1 MeV electron flux evolution is compared with the SAMPEX/HILT observations. The results show that the VERB code predicts overall time evolution of the observed split structure. The simulated split structure is produced by pitch angle scattering into the Earth atmosphere of ~1 MeV electrons by plasmaspheric hiss.

Authors (sorted by name)

Blake Shprits

Journal / Conference

Journal Of Geophysical Research (Space Physics)

Acknowledgments

We thank the GSFC/SPDF OMNIWeb for provision of the solar wind parameters and geomagnetic activity indices used in this report. We thank Josef Koller for the provision of the LANL* code. HEO‐3 particle data were provided to the Virtual Radiation Belt Observatory (ViRBO) by the Aerospace Corporation. SAMPEX particle data were provided from the SAMPEX Data Center at Caltech. We would like to thank Juan Rodriguez for making NOAA‐15 particle data available at ftp://satdat.ngdc.noaa.gov/sem/poes/data/. All diffusion coefficients used in this study are available at http://rbm.epss.ucla.edu/.

Bibtex

@article{doi:10.1002/2015JA022072,
author = {Kim, Kyung-Chan and Shprits, Yuri Y. and Blake, J. Bernard},
title = {Fast injection of the relativistic electrons into the inner zone and the formation of the split-zone structure during the Bastille Day storm in July 2000},
year = {2016},
journal = {Journal of Geophysical Research: Space Physics},
volume = {121},
number = {9},
pages = {8329-8342},
keywords = {inner radiation zone and slot region, Bastille Day geomagnetic storm, 3-D diffusion simulation, plasmaspheric hiss},
doi = {10.1002/2015JA022072},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2015JA022072},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2015JA022072},
abstract = {Abstract During the July 2000 geomagnetic storm, known as the Bastille Day storm, Solar, Anomalous, and Magnetospheric Particle Explorer (SAMPEX)/Heavy Ion Large Telescope (HILT) observed a strong injection of ~1 MeV electrons into the slot region (L ~ 2.5) during the storm main phase. Then, during the following month, electrons were clearly seen diffusing inward down to L = 2 and forming a pronounced split structure encompassing a narrow, newly formed slot region around L = 3. SAMPEX observations are first compared with electron and proton observations on HEO-3 and NOAA-15 to validate that the observed unusual dynamics was not caused by proton contamination of the SAMPEX instrument. The time-dependent 3-D Versatile Electron Radiation Belt (VERB) simulation of 1 MeV electron flux evolution is compared with the SAMPEX/HILT observations. The results show that the VERB code predicts overall time evolution of the observed split structure. The simulated split structure is produced by pitch angle scattering into the Earth atmosphere of ~1 MeV electrons by plasmaspheric hiss.}
}