Results 51 to 60 of about 2,661,724 (245)

Wavenumber Analysis of EMIC Waves

Geophysical Research Letters, 2019
AbstractIt has been highly controversial as to whether and how efficient electromagnetic ion cyclotron (EMIC) waves can scatter sub–megaelectronvolt (MeV) to multi–megaelectron volt electrons into the atmospheric loss cone. The capability of EMIC wave scattering essentially depends on the wavenumber spectra, instead of readily available frequency ...
Lunjin Chen, Hui Zhu, Xiaojia Zhang
openaire   +1 more source

Occurrence characteristics of electromagnetic ion cyclotron waves at sub-auroral Antarctic station Maitri during solar cycle 24

Earth, Planets and Space, 2020
We present a statistical study of electromagnetic ion cyclotron (EMIC) waves observed at Antarctic station (geographic $$70.7{^\circ }\,\hbox {S}$$ 70.7 ∘ S , $$11.8{^\circ }\,\hbox {E}$$ 11.8 ∘ E , $$L=5$$ L = 5 ) on quiet and disturbed days during 2011–
Aditi Upadhyay, Bharati Kakad, Amar Kakad, Yoshiharu Omura, Ashwini Kumar Sinha   +4 more
doaj   +1 more source

Scattering of Ultra-relativistic Electrons in the Van Allen Radiation Belts Accounting for Hot Plasma Effects. [PDF]

, 2017
Electron flux in the Earth's outer radiation belt is highly variable due to a delicate balance between competing acceleration and loss processes. It has been long recognized that Electromagnetic Ion Cyclotron (EMIC) waves may play a crucial role in the ...
Cao, Xing, Ni, Binbin, Shprits, Yuri Y, Zhelavskaya, Irina S   +3 more
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Investigation of EMIC wave scattering as the cause for the BARREL 17 January 2013 relativistic electron precipitation event: A quantitative comparison of simulation with observations [PDF]

, 2014
Electromagnetic ion cyclotron (EMIC) waves were observed at multiple observatory locations for several hours on 17 January 2013. During the wave activity period, a duskside relativistic electron precipitation (REP) event was observed by one of the ...
Albert, Baker, Baker, Blake, Bortnik, Carson, Chappell, Chen, Chen, Chen, Chen, Comess, David M. Smith, Denton, Engebretson, Farrugia, Foat, Funsten, Gannon, Goldstein, Green, Harlan E. Spence, Hartley, Horne, Horwitz, Hu, Imhof, Jerry Goldstein, Joseph F. Fennell, Juan V. Rodriguez, Kletzing, Leslie A. Woodger, Li, Lorentzen, Loto'aniu, Lyons, Mark J. Engebretson, Mary K. Hudson, Mauk, Millan, Millan, Miyoshi, Onsager, Reiner Friedel, Robyn M. Millan, Rodger, Rodriguez, Sandanger, Spasojević, Spence, Summers, Summers, Takahashi, Thorne, Thorne, Thorne, Tsyganenko, Usanova, Vampola, West, Wygant, Yahnin, Young, Yue Chen, Zan Li   +64 more
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Simultaneous occurrence of four magnetospheric wave modes and the resultant combined scattering effect on radiation belt electrons

Earth and Planetary Physics, 2022
We report a representative concurrent event of four wave modes at L ≈ 5.0, including electrostatic electron cyclotron harmonic (ECH) waves, exohiss, magnetosonic (MS) waves, and electromagnetic ion cyclotron (EMIC) waves, based on the observations from ...
YiWen Zhao, Zheng Xiang, XuDong Gu, BinBin Ni, Xin Ma, YueQun Lou, LuHuai Jiao, RuoXian Zhou, DeYu Guo, YangXiZi Liu, JunHu Dong   +10 more
doaj   +1 more source

EMIC Wave Events During the Four GEM QARBM Challenge Intervals [PDF]

Journal of Geophysical Research: Space Physics, 2018
AbstractThis paper presents observations of electromagnetic ion cyclotron (EMIC) waves from multiple data sources during the four Geospace Environment Modeling challenge events in 2013 selected by the Geospace Environment Modeling Quantitative Assessment of Radiation Belt Modeling focus group: 17 and 18 March (stormtime enhancement), 31 May to 2 June ...
M. J. Engebretson, J. L. Posch, D. J. Braun, W. Li, Q. Ma, A. C. Kellerman, C.‐L. Huang, S. G. Kanekal, C. A. Kletzing, J. R. Wygant, H. E. Spence, D. N. Baker, J. F. Fennell, V. Angelopoulos, H. J. Singer, M. R. Lessard, R. B. Horne, T. Raita, K. Shiokawa, R. Rakhmatulin, E. Dmitriev, E. Ermakova   +21 more
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Ionospheric Modulation by EMIC Wave‐Driven Proton Precipitation: Observations and Simulations

Journal of Geophysical Research: Space Physics, 2023
AbstractProtons of tens of keV can be resonantly scattered by electromagnetic ion cyclotron (EMIC) waves excited in the magnetosphere, resulting in proton precipitation down to the upper atmosphere. In this study, we report for the first time the ionospheric height‐dependent ionization in response to EMIC‐associated isolated proton aurora (IPA) using ...
Xingbin Tian, Yiqun Yu, Fan Gong, Longxing Ma, Jinbin Cao, Stanley C. Solomon, P. R. Shreedevi, Kazuo Shiokawa, Yuichi Otsuka, Shin‐ichiro Oyama, Yoshizumi Miyoshi   +10 more
openaire   +2 more sources

Rapid Loss of Relativistic Electrons by EMIC Waves in the Outer Radiation Belt Observed by Arase, Van Allen Probes, and the PWING Ground Stations

Geophysical Research Letters, 2018
There has been increasing evidence for pitch angle scattering of relativistic electrons by electromagnetic ion cyclotron (EMIC) waves. Theoretical studies have predicted that the loss time scale of MeV electrons by EMIC waves can be very fast, suggesting
S. Kurita, Y. Miyoshi, K. Shiokawa, N. Higashio, T. Mitani, T. Takashima, A. Matsuoka, I. Shinohara, C. A. Kletzing, J. B. Blake, S. G. Claudepierre, M. Connors, S. Oyama, T. Nagatsuma, K. Sakaguchi, D. Baishev, Y. Otsuka   +16 more
doaj   +1 more source

High-resolution in situ observations of electron precipitation-causing EMIC waves [PDF]

, 2015
Electromagnetic ion cyclotron (EMIC) waves are thought to be important drivers of energetic electron losses from the outer radiation belt through precipitation into the atmosphere. While the theoretical possibility of pitch angle scattering-driven losses
Aaron T. Hendry, Baker, Blake, Blum, Carson, Chen, Clilverd, Clilverd, Cornwall, Craig A. Kletzing, Craig J. Rodger, Drozdov, Engebretson, Evans, Geoffrey D. Reeves, Gurnett, Hendry, James B. Brundell, Kennel, Kletzing, Kurth, Mark A. Clilverd, Meredith, Ni, Omura, Paulson, Rodger, Rodger, Rodger, Rodger, Roederer, Saikin, Sandanger, Shprits, Sibeck, Summers, Thorne, Thorne, Ukhorskiy, Usanova, Xiao, Yando   +41 more
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Observations of coincident EMIC wave activity and dusk-side energetic electron precipitation on 18-19 January 2013 [PDF]

, 2015
Electromagnetic ion cyclotron (EMIC) waves have been suggested to be a cause of radiation belt electron loss to the atmosphere. Here simultaneous, magnetically conjugate measurements are presented of EMIC wave activity, measured at geosynchronous orbit ...
A. Halford, Anderson, Anderson, Blum, Blum, Bortnik, Carson, Chen, Clilverd, Comess, Cornwall, Cornwall, Denton, Engebretson, Erlandson, Foat, G. Reeves, Gendrin, Goldstein, Goldstein, H. Singer, Halford, Halford, Imhof, J. Goldstein, J. W. Bonnell, Jordanova, Jordanova, Keika, L. W. Blum, Li, Li, Lorentzen, Lyons, M. Clilverd, M. Engebretson, M. Ohnsted, M. Usanova, Mann, McCollough, McCollough, Meredith, Millan, Millan, Millan, Min, Miyoshi, Nakamura, Olson, R. Millan, Sandanger, Soria-Santacruz, Summers, Thorne, Tsyganenko, Ukhorskiy, Usanova, Vampola, Wang, Woodger, X. Li   +60 more
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