globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024054
Scopus记录号: 2-s2.0-85040719770
论文题名:
The Quasi-monochromatic ULF Wave Boundary in the Venusian Foreshock: Venus Express Observations
作者: Shan L.; Mazelle C.; Meziane K.; Romanelli N.; Ge Y.S.; Du A.; Lu Q.; Zhang T.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:1
起始页码: 374
结束页码: 384
语种: 英语
英文关键词: foreshock ; ULF wave ; Venus ; wave boundary
英文摘要: The location of ultralow-frequency (ULF) quasi-monochromatic wave onset upstream of Venus bow shock is explored using Venus Express magnetic field data. We report the existence of a spatial foreshock boundary behind which ULF waves are present. We have found that the ULF wave boundary at Venus is sensitive to the interplanetary magnetic field (IMF) direction like the terrestrial one and appears well defined for a cone angle larger than 30°. In the Venusian foreshock, the inclination angle of the wave boundary with respect to the Sun-Venus direction increases with the IMF cone angle. We also found that for the IMF nominal direction (θBX = 36°) at Venus' orbit, the value of this inclination angle is 70°. Moreover, we have found that the inferred velocity of an ion traveling along the ULF boundary is in a qualitative agreement with a quasi-adiabatic reflection of a portion of the solar wind at the bow shock. For an IMF nominal direction at Venus, the inferred bulk speed of ions traveling along this boundary is 1.07 VSW, sufficiently enough to overcome the solar wind convection. This strongly suggests that the backstreaming ions upstream of the Venusian bow shock provide the main energy source for the ULF waves. ©2017. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114754
Appears in Collections:气候减缓与适应

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作者单位: Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; CAS Key Laboratory of Lunar and Deep Space Exploration, Beijing, China; Institutions of Earth Science, Chinese Academy of Sciences, Beijing, China; IRAP, Université de Toulouse, CNRS, UPS, CNES, Toulouse, France; Physics Department, University of New Brunswick, Fredericton, NB, Canada; LATMOS, Université Pierre et Marie Curie, Paris, France; College of Earth Sciences, University of Chinese Academy of Sciences, Beijing, China; CAS Key Lab of Geospace Environment, University of Science and Technology of China, Hefei, China; Space Research Institute, Austrian Academy of Sciences, Graz, Austria

Recommended Citation:
Shan L.,Mazelle C.,Meziane K.,et al. The Quasi-monochromatic ULF Wave Boundary in the Venusian Foreshock: Venus Express Observations[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)
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