globalchange  > 气候减缓与适应
DOI: 10.1029/2018JA025343
Scopus记录号: 2-s2.0-85050883426
论文题名:
Statistical Study of the Properties of Magnetosheath Lion Roars
作者: Giagkiozis S.; Wilson L.B.; Burch J.L.; Le Contel O.; Ergun R.E.; Gershman D.J.; Lindqvist P.-A.; Mirioni L.; Moore T.E.; Strangeway R.J.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:7
起始页码: 5435
结束页码: 5451
语种: 英语
英文关键词: lion roar properties ; lion roars ; magnetosheath emissions ; whistler waves
英文摘要: Lion roars are narrowband whistler wave emissions that have been observed in several environments, such as planetary magnetosheaths, the Earth's magnetosphere, the solar wind, downstream of interplanetary shocks, and the cusp region. We present measurements of more than 30,000 such emissions observed by the Magnetospheric Multiscale spacecraft with high-cadence (8,192 samples/s) search coil magnetometer data. A semiautomatic algorithm was used to identify the emissions, and an adaptive interval algorithm in conjunction with minimum variance analysis was used to determine their wave vector. The properties of the waves are determined in both the spacecraft and plasma rest frame. The mean wave normal angle, with respect to the background magnetic field (B0), plasma bulk flow velocity (Vb), and the coplanarity plane (Vb×B0) are 23°, 56°, and 0°, respectively. The average peak frequencies were ∼31% of the electron gyrofrequency (ωce) observed in the spacecraft frame and ∼18% of ωce in the plasma rest frame. In the spacecraft frame, ∼99% of the emissions had a frequency <ωce, while 98% had a peak frequency <0.72ωce in the plasma rest frame. None of the waves had frequencies lower than the lower hybrid frequency, ω. From the probability density function of the electron plasma βe, the ratio between the electron thermal and magnetic pressure, ∼99.6% of the waves were observed with βe<4 with a large narrow peak at 0.07 and two smaller, but wider, peaks at 1.26 and 2.28, while the average value was ∼1.25. ©2018. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113665
Appears in Collections:气候减缓与适应

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作者单位: Automatic Control and Systems Engineering, University of Sheffield, Sheffield, United Kingdom; Heliophysics Science Division, NASA Goddard Spaceflight Center, Greenbelt, MD, United States; Southwest Research Institute, San Antonio, TX, United States; Laboratoire de Physique des Plasmas, UMR7648, CNRS, Ecole Polytechnique, Sorbonne Universités, Université Paris-Sud, Observatoire de Paris, Paris, France; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; Fields and Particles, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Department of Astronomy, University of Maryland, College Park, MD, United States; Department of Space and Plasma Physics, KTH Royal Institute of Technology, Stockholm, Sweden; Laboratoire de Physique des Plasmas (LPP), CNRS/ Ecole Polytechnique/ Sorbonne Universités UPMC/ Paris-Sud 11, Palaiseau, France; Institute of Geophysics and Planetary Physics and Earth and Space Sciences, University of California, Los Angeles, CA, United States

Recommended Citation:
Giagkiozis S.,Wilson L.B.,Burch J.L.,et al. Statistical Study of the Properties of Magnetosheath Lion Roars[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(7)
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