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Intense duskside lower band chorus waves observed by Van Allen Probes: Generation and potential acceleration effect on radiation belt electrons

Su Z., H. Zhu, F. Xiao, H. Zheng, Y. Wang, Z. He, C. Shen, C. Shen, C. B. Wang, R. Liu, M. Zhang, S. Wang, C. A. Kletzing, W. S. Kurth, G. B. Hospodarsky, H. E. Spence, G. D. Reeves, H. O. Funsten, J. B. Blake, D. N. Baker, J. R. Wygant, (2014), Intense duskside lower band chorus waves observed by Van Allen Probes: Generation and potential acceleration effect on radiation belt electrons, J. of Geophys. Res. [Space Physics], 119, 4266-4273, doi:10.1002/2014JA019919

Abstract

AbstractLocal acceleration driven by whistler mode chorus waves largely accounts for the enhancement of radiation belt relativistic electron fluxes, whose favored region is usually considered to be the plasmatrough with magnetic local time approximately from midnight through dawn to noon. On 2 October 2013, the Van Allen Probes recorded a rarely reported event of intense duskside lower band chorus waves (with power spectral density up to 10−3nT2/Hz) in the low-latitude region outside of L=5. Such chorus waves are found to be generated by the substorm-injected anisotropic suprathermal electrons and have a potentially strong acceleration effect on the radiation belt energetic electrons. This event study demonstrates the possibility of broader spatial regions with effective electron acceleration by chorus waves than previously expected. For such intense duskside chorus waves, the occurrence probability, the preferential excitation conditions, the time duration, and the accurate contribution to the long-term evolution of radiation belt electron fluxes may need further investigations in future.

Authors (sorted by name)

Baker Blake Funsten He Hospodarsky Kletzing Kurth Reeves Shen Spence Su Wygant Xiao Zhang Zheng Zhu

Journal / Conference

Journal Of Geophysical Research (Space Physics)

Acknowledgments

The data for this paper are available at the following RBSP websites: EMFSIS, http://emfisis.physics.uiowa.edu/Flight/http://rbsp‐b_WFR‐spectral‐matrix_emfisis‐L2_20131002_v1.3.5.cdfhttp://rbsp‐a_WFR‐spectral‐matrix_emfisis‐L2_20131002_v1.3.6.cdfhttp://rbsp‐b_magnetometer_uvw_emfisis‐L2_20131002_v1.3.1.cdf, and http://rbsp‐a_magnetometer_uvw_emfisis‐L2_20131002_v1.3.1.cdf; ECT, http://www.rbsp‐ect.lanl.gov/data_pub/http://rbspb_rel02_ect‐hope‐PA‐L3_20131002_v4.0.0.cdf, and http://rbspb_rel02_ect-mageis‐merged‐L3_20131002_v3.0.0.cdf; EFW, http://rbsp.space.umn.edu/data/rbsp/http://rbspb_efw-l2_esvy_despun_20131002_v01.cdf. We acknowledge K. Ronnmark for the using of WHAMP code. This work was supported by the National Natural Science Foundation of China grants 41274169, 41274174, 41174125, 41131065, 41121003, 41074120, 41231066, and 41304134, the Chinese Academy of Sciences grants KZCX2‐EW‐QN510 and KZZD‐EW‐01‐4, the National Key Basic Research Special Foundation of China grant 2011CB811403, the Strategic Priority Research Program on Space Science of the Chinese Academy of Sciences grant XDA04060201, and the Fundamental Research Funds for the Central Universities WK2080000031. This work was also supported from JHU/APL contracts 921647 and 967399 under NASA Prime contract NAS5‐01072.

Grants

921647 967399 NAS5‐01072

Bibtex

@article{doi:10.1002/2014JA019919,
author = {Su, Zhenpeng and Zhu, Hui and Xiao, Fuliang and Zheng, Huinan and Wang, Yuming and He, Zhaoguo and Shen, Chao and Shen, Chenglong and Wang, C. B. and Liu, Rui and Zhang, Min and Wang, Shui and Kletzing, C. A. and Kurth, W. S. and Hospodarsky, G. B. and Spence, H. E. and Reeves, G. D. and Funsten, H. O. and Blake, J. B. and Baker, D. N. and Wygant, J. R.},
title = {Intense duskside lower band chorus waves observed by Van Allen Probes: Generation and potential acceleration effect on radiation belt electrons},
journal = {Journal of Geophysical Research: Space Physics},
volume = {119},
number = {6},
pages = {4266-4273},
year ={2014},
keywords = {radiation belt, wave-particle interaction, electron acceleration, chorus, plasma instability, diffusion coefficients},
doi = {10.1002/2014JA019919},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2014JA019919},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2014JA019919},
abstract = {AbstractLocal acceleration driven by whistler mode chorus waves largely accounts for the enhancement of radiation belt relativistic electron fluxes, whose favored region is usually considered to be the plasmatrough with magnetic local time approximately from midnight through dawn to noon. On 2 October 2013, the Van Allen Probes recorded a rarely reported event of intense duskside lower band chorus waves (with power spectral density up to 10−3nT2/Hz) in the low-latitude region outside of L=5. Such chorus waves are found to be generated by the substorm-injected anisotropic suprathermal electrons and have a potentially strong acceleration effect on the radiation belt energetic electrons. This event study demonstrates the possibility of broader spatial regions with effective electron acceleration by chorus waves than previously expected. For such intense duskside chorus waves, the occurrence probability, the preferential excitation conditions, the time duration, and the accurate contribution to the long-term evolution of radiation belt electron fluxes may need further investigations in future.}
}