globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024869
Scopus记录号: 2-s2.0-85041215977
论文题名:
Van Allen Probes Observations of Second Harmonic Poloidal Standing Alfvén Waves
作者: Takahashi K.; Oimatsu S.; Nosé M.; Min K.; Claudepierre S.G.; Chan A.; Wygant J.; Kim H.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:1
起始页码: 611
结束页码: 637
语种: 英语
英文关键词: bounce and drift-bounce resonances ; energetic protons ; plasmasphere ; poloidal ULF waves ; second harmonic ; Van Allen Probes
英文摘要: Long-lasting second-harmonic poloidal standing Alfvén waves (P2 waves) were observed by the twin Van Allen Probes (Radiation Belt Storm Probes, or RBSP) spacecraft in the noon sector of the plasmasphere, when the spacecraft were close to the magnetic equator and had a small azimuthal separation. Oscillations of proton fluxes at the wave frequency (∼10 mHz) were also observed in the energy (W) range 50–300 keV. Using the unique RBSP orbital configuration, we determined the phase delay of magnetic field perturbations between the spacecraft with a 2nπ ambiguity. We then used finite gyroradius effects seen in the proton flux oscillations to remove the ambiguity and found that the waves were propagating westward with an azimuthal wave number (m) of ∼−200. The phase of the proton flux oscillations relative to the radial component of the wave magnetic field progresses with W, crossing 0 (northward moving protons) or 180° (southward moving protons) at W ∼ 120 keV. This feature is explained by drift-bounce resonance (mωd ∼ ωb) of ∼120 keV protons with the waves, where ωd and ωb are the proton drift and bounce frequencies. At lower energies, the proton phase space density (FH+) exhibits a bump-on-tail structure with ∂FH+/∂W >0 occurring in the 1–10 keV energy range. This FH+ is unstable and can excite P2 waves through bounce resonance (ω ∼ ωb), where ω is the wave frequency. ©2018. American Geophysical Union. All Rights Reserved.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114744
Appears in Collections:气候减缓与适应

Files in This Item:

There are no files associated with this item.


作者单位: The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States; Graduate School of Science, Kyoto University, Kyoto, Japan; Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University, Kyoto, Japan; Space Sciences Department, The Aerospace Corporation, Los Angeles, CA, United States; Department of Physics and Astronomy, Rice University, Houston, TX, United States; School of Physics and Astronomy, University of Minnesota, Twin Cities, Minneapolis, MN, United States; Center for Solar-Terrestrial Research, New Jersey Institute of Technology, Newark, NJ, United States

Recommended Citation:
Takahashi K.,Oimatsu S.,Nosé M.,et al. Van Allen Probes Observations of Second Harmonic Poloidal Standing Alfvén Waves[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Takahashi K.]'s Articles
[Oimatsu S.]'s Articles
[Nosé M.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Takahashi K.]'s Articles
[Oimatsu S.]'s Articles
[Nosé M.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Takahashi K.]‘s Articles
[Oimatsu S.]‘s Articles
[Nosé M.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.