globalchange  > 科学计划与规划
DOI: 10.1002/2016GL069188
Multispacecraft analysis of dipolarization fronts and associated whistler wave emissions using MMS data
Author: Breuillard H.; Le Contel O.; Retino A.; Chasapis A.; Chust T.; Mirioni L.; Graham D.B.; Wilder F.D.; Cohen I.; Vaivads A.; Khotyaintsev Y.V.; Lindqvist P.-A.; Marklund G.T.; Burch J.L.; Torbert R.B.; Ergun R.E.; Goodrich K.A.; Macri J.; Needell J.; Chutter M.; Rau D.; Dors I.; Russell C.T.; Magnes W.; Strangeway R.J.; Bromund K.R.; Plaschke F.; Fischer D.; Leinweber H.K.; Anderson B.J.; Le G.; Slavin J.A.; Kepko E.L.; Baumjohann W.; Mauk B.; Fuselier S.A.; Nakamura R.
Source Publication: Geophysical Research Letters
ISSN: 0094-8880
EISSN: 1944-8611
Publishing Year: 2016
Volume: 43, Issue:14
pages begin: 7279
pages end: 7286
Language: 英语
Keyword: dipolarization fronts ; Earth magnetotail
Scopus Keyword: Atmospherics ; Electron emission ; Ions ; Magnetosphere ; Plasma sheaths ; Dipolarization ; Intersatellite distance ; Magnetospheric multiscale missions ; Magnetotails ; Plasma sheet dynamics ; Separation distances ; Temperature anisotropy ; Whistler wave emission ; Dynamics ; anisotropy ; dissipation ; electromagnetic wave ; electron ; geodynamics ; magnetotail ; plasma ; polarization ; satellite mission ; separation ; solar wind ; spacecraft
English Abstract: Dipolarization fronts (DFs), embedded in bursty bulk flows, play a crucial role in Earth's plasma sheet dynamics because the energy input from the solar wind is partly dissipated in their vicinity. This dissipation is in the form of strong low-frequency waves that can heat and accelerate energetic electrons up to the high-latitude plasma sheet. However, the dynamics of DF propagation and associated low-frequency waves in the magnetotail are still under debate due to instrumental limitations and spacecraft separation distances. In May 2015 the Magnetospheric Multiscale (MMS) mission was in a string-of-pearls configuration with an average intersatellite distance of 160 km, which allows us to study in detail the microphysics of DFs. Thus, in this letter we employ MMS data to investigate the properties of dipolarization fronts propagating earthward and associated whistler mode wave emissions. We show that the spatial dynamics of DFs are below the ion gyroradius scale in this region (∼500 km), which can modify the dynamics of ions in the vicinity of the DF (e.g., making their motion nonadiabatic). We also show that whistler wave dynamics have a temporal scale of the order of the ion gyroperiod (a few seconds), indicating that the perpendicular temperature anisotropy can vary on such time scales. ©2016. American Geophysical Union. All Rights Reserved.
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Document Type: 期刊论文
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Affiliation: Laboratoire de Physique des Plasmas (LPP/CNRS UMR), Paris, France

Recommended Citation:
Breuillard H.,Le Contel O.,Retino A.,et al. Multispacecraft analysis of dipolarization fronts and associated whistler wave emissions using MMS data[J]. Geophysical Research Letters,2016-01-01,43(14).
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