气候变化领域集成服务门户(CCPortal): Detection of Hertz Frequency Multiharmonic Field Line Resonances at Low-L (L = 1.1–1.5) During Van Allen Probe Perigee Passes

CCPortal

DOI	10.1029/2020GL090632
	Detection of Hertz Frequency Multiharmonic Field Line Resonances at Low-L (L = 1.1–1.5) During Van Allen Probe Perigee Passes
	Lena F.R.; Ozeke L.G.; Wygant J.R.; Tian S.; Breneman A.W.; Mann I.R.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:1
英文摘要	We present new and previously unreported in situ observations of Hertz frequency multiharmonic mode field line resonances detected by the Electric Field and Waves instrument on-board the NASA Van Allen probes during low-L perigee passes. Spectral analysis of the spin-plane electric field data reveals the waves in numerous perigee passes, in sequential passes of probes A and B, and with harmonic frequency structures from ∼0.5 to 3.5 Hz which vary with L-shell, altitude, and from day-to-day. Comparing the observations to wave models using plasma mass density values along the field line given by empirical power laws and from the International Reference Ionosphere model, we conclude that the waves are standing Alfvén field line resonances and that only odd-mode harmonics are excited. The model eigenfrequencies are strongly controlled by the density close to the apex of the field line, suggesting a new diagnostic for equatorial ionospheric density dynamics. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Electric fields; Ionosphere; NASA; Probes; Resonance; Spectrum analysis; Eigen frequencies; Field line resonances; Harmonic frequency; In-situ observations; International reference ionospheres; Mode fields; Multiharmonic; Plasma mass density; Electric lines
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169274
作者单位	Department of Physics, University of Alberta, Edmonton, AB, Canada; Sao Carlos School of Engineering, University of Sao Paulo, Sao Carlos, Sao Paulo, Brazil; School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, United States
推荐引用方式 GB/T 7714	Lena F.R.,Ozeke L.G.,Wygant J.R.,等. Detection of Hertz Frequency Multiharmonic Field Line Resonances at Low-L (L = 1.1–1.5) During Van Allen Probe Perigee Passes[J],2021,48(1).
APA	Lena F.R.,Ozeke L.G.,Wygant J.R.,Tian S.,Breneman A.W.,&Mann I.R..(2021).Detection of Hertz Frequency Multiharmonic Field Line Resonances at Low-L (L = 1.1–1.5) During Van Allen Probe Perigee Passes.Geophysical Research Letters,48(1).
MLA	Lena F.R.,et al."Detection of Hertz Frequency Multiharmonic Field Line Resonances at Low-L (L = 1.1–1.5) During Van Allen Probe Perigee Passes".Geophysical Research Letters 48.1(2021).