globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024551
Scopus ID: 2-s2.0-85042310063
The Properties of Lion Roars and Electron Dynamics in Mirror Mode Waves Observed by the Magnetospheric MultiScale Mission
Author: Breuillard H.; LeContel O.; Chust T.; Berthomier M.; Retino A.; Turner D.L.; Nakamura R.; Baumjohann W.; Cozzani G.; Catapano F.; Alexandrova A.; Mirioni L.; Graham D.B.; Argall M.R.; Fischer D.; Wilder F.D.; Gershman D.J.; Varsani A.; Lindqvist P.-A.; Khotyaintsev Y.V.; Marklund G.; Ergun R.E.; Goodrich K.A.; Ahmadi N.; Burch J.L.; Torbert R.B.; Needell G.; Chutter M.; Rau D.; Dors I.; Russell C.T.; Magnes W.; Strangeway R.J.; Bromund K.R.; Wei H.; Plaschke F.; Anderson B.J.; Le G.; Moore T.E.; Giles B.L.; Paterson W.R.; Pollock C.J.; Dorelli J.C.; Avanov L.A.; Saito Y.; Lavraud B.; Fuselier S.A.; Mauk B.H.; Cohen I.J.; Fennell J.F.
Source Publication: Journal of Geophysical Research: Space Physics
ISSN: 21699380
Publishing Year: 2018
Volume: 123, Issue:1
pages begin: 93
pages end: 103
Language: 英语
Keyword: lion roars ; magnetosheath ; mirror modes ; nonlinear waves ; particle trapping ; wave-particle interaction
English Abstract: Mirror mode waves are ubiquitous in the Earth's magnetosheath, in particular behind the quasi-perpendicular shock. Embedded in these nonlinear structures, intense lion roars are often observed. Lion roars are characterized by whistler wave packets at a frequency ∼100 Hz, which are thought to be generated in the magnetic field minima. In this study, we make use of the high time resolution instruments on board the Magnetospheric MultiScale mission to investigate these waves and the associated electron dynamics in the quasi-perpendicular magnetosheath on 22 January 2016. We show that despite a core electron parallel anisotropy, lion roars can be generated locally in the range 0.05–0.2fce by the perpendicular anisotropy of electrons in a particular energy range. We also show that intense lion roars can be observed up to higher frequencies due to the sharp nonlinear peaks of the signal, which appear as sharp spikes in the dynamic spectra. As a result, a high sampling rate is needed to estimate correctly their amplitude, and the latter might have been underestimated in previous studies using lower time resolution instruments. We also present for the first-time 3-D high time resolution electron velocity distribution functions in mirror modes. We demonstrate that the dynamics of electrons trapped in the mirror mode structures are consistent with the Kivelson and Southwood (1996) model. However, these electrons can also interact with the embedded lion roars: first signatures of electron quasi-linear pitch angle diffusion and possible signatures of nonlinear interaction with high-amplitude wave packets are presented. These processes can lead to electron untrapping from mirror modes. ©2017. American Geophysical Union. All Rights Reserved.
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被引频次[WOS]:13   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:气候减缓与适应

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Affiliation: Laboratoire de Physique des Plasmas, UMR7648, CNRS, Ecole Polytechnique, UPMC Univ Paris 06, Univ. Paris-Sud, Observatoire de Paris, Paris, France; Space Sciences Department, The Aerospace Corporation, El Segundo, CA, United States; Space Research Institute, Austrian Academy of Sciences, Graz, Austria; Swedish Institute of Space Physics, Uppsala, Sweden; Department of Physics and Space Science Center, University of New Hampshire, Durham, NH, United States; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Royal Institute of Technology, Stockholm, Sweden; Southwest Research Institute, San Antonio, TX, United States; Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA, United States; Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD, United States; Institute for Space and Astronautical Science, Sagamihara, Japan; Institut de Recherche en Astrophysique et Planétologie, CNRS UMR5277/Université Paul Sabatier, Toulouse, France

Recommended Citation:
Breuillard H.,LeContel O.,Chust T.,et al. The Properties of Lion Roars and Electron Dynamics in Mirror Mode Waves Observed by the Magnetospheric MultiScale Mission[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)
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