Results 41 to 50 of about 994 (229)

Ray tracing of whistler-mode chorus elements: implications for generation mechanisms of rising and falling tone emissions [PDF]

Annales Geophysicae, 2013
Using a well-established magnetospheric very-low-frequency (VLF) ray tracing method, in this work we trace the propagation of individual rising- and falling-frequency elements of VLF chorus from their generation point in the equatorial region of the ...
K. Yamaguchi, T. Matsumuro, Y. Omura, D. Nunn, D. Nunn   +4 more
doaj   +1 more source

Ducted Chorus Waves Cause Sub‐Relativistic and Relativistic Electron Microbursts

Geophysical Research Letters, 2022
AbstractDuring magnetospheric storms, radiation belt electrons are produced and then removed by collisions with the lower atmosphere on varying timescales. An efficient loss process is microbursts, strong, transient precipitation of electrons over a wide energy range, from tens of keV to sub‐relativistic and relativistic energies (100s keV and above ...
Lunjin Chen, Xiao‐Jia Zhang, Anton Artemyev, Vassilis Angelopoulos, Ethan Tsai, Colin Wilkins, Richard B. Horne   +6 more
openaire   +2 more sources

Nonlinear Coupling Between Whistler‐Mode Chorus and Electron Cyclotron Harmonic Waves in the Magnetosphere

Geophysical Research Letters, 2018
Electromagnetic whistler‐mode chorus and electrostatic electron cyclotron harmonic (ECH) waves can contribute significantly to auroral electron precipitation and radiation belt electron acceleration.
Zhonglei Gao, Zhenpeng Su, Fuliang Xiao, Danny Summers, Nigang Liu, Huinan Zheng, Yuming Wang, Fengsi Wei, Shui Wang   +8 more
doaj   +1 more source

Ensemble Modeling of Radiation Belt Electron Acceleration by Chorus Waves: Dependence on Key Input Parameters

Space Weather, 2023
We perform ensemble simulations of radiation belt electron acceleration using the quasi‐linear approach during the storm on 9 October 2012, where chorus waves dominated electron acceleration at L = 5.2.
Man Hua, Jacob Bortnik, Adam C. Kellerman, Enrico Camporeale, Qianli Ma   +4 more
doaj   +1 more source

Electron diffusion by chorus waves: effects of latitude-dependent wave power spectrum

Frontiers in Astronomy and Space Sciences, 2023
In the present paper, we investigate the effects of latitude-dependent wave power spectrum on the interactions of chorus with electrons. Great errors in evaluating the electron diffusion coefficients and the resultant electron temporal evolutions are introduced by the widely adopted latitudinally constant model, compared with the latitudinally varying ...
Jiang Yu, Jing Wang, Zhaoguo He, Zhaoguo He, Zhaoguo He, Zuzheng Chen, Liuyuan Li, Jun Cui, Jun Cui, Jinbin Cao   +9 more
openaire   +2 more sources

Van Allen Probes Observations of Chorus Wave Vector Orientations: Implications for the Chorus‐to‐Hiss Mechanism [PDF]

Geophysical Research Letters, 2019
AbstractUsing observations from the Van Allen Probes EMFISIS instrument, coupled with ray tracing simulations, we determine the fraction of chorus wave power with the conditions required to access the plasmasphere and evolve into plasmaspheric hiss.
D. P. Hartley, C. A. Kletzing, L. Chen, R. B. Horne, O. Santolík   +4 more
openaire   +3 more sources

Magion 5 observations of chorus-like emissions and their propagation features as inferred from ray-tracing simulation [PDF]

Annales Geophysicae, 2003
After reviewing briefly the present state of knowledge about chorus-like emissions, we present an overview of Magion 5 satellite observations of these emissions in the inner magnetosphere of the Earth.
J. Chum, F. Jiříček, J. Šmilauer, D. Shklyar   +3 more
doaj   +1 more source

Analytical Chorus Wave Model Derived from Van Allen Probe Observations [PDF]

Journal of Geophysical Research: Space Physics, 2019
AbstractChorus waves play an important role in the dynamic evolution of energetic electrons in the Earth's radiation belts and ring current. Using more than 5 years of Van Allen Probe data, we developed a new analytical model for upper‐band chorus (UBC; 0.5fce < f < fce) and lower‐band chorus (LBC; 0.05fce < f < 0.5fce) waves, where fce is ...
Dedong Wang, Yuri Y. Shprits, Irina S. Zhelavskaya, Oleksiy V. Agapitov, Alexander Y. Drozdov, Nikita A. Aseev   +5 more
openaire   +4 more sources

Multiple time-scale beats in aurora: precise orchestration via magnetospheric chorus waves [PDF]

Scientific Reports, 2020
AbstractThe brightness of aurorae in Earth’s polar region often beats with periods ranging from sub-second to a few tens of a second. Past observations showed that the beat of the aurora is composed of a superposition of two independent periodicities that co-exist hierarchically.
K. Hosokawa, Y. Miyoshi, M. Ozaki, S.-I. Oyama, Y. Ogawa, S. Kurita, Y. Kasahara, Y. Kasaba, S. Yagitani, S. Matsuda, F. Tsuchiya, A. Kumamoto, R. Kataoka, K. Shiokawa, T. Raita, E. Turunen, T. Takashima, I. Shinohara, R. Fujii   +18 more
openaire   +3 more sources

On–Off Switchable Micromotors for Use in Steerable Microvehicles

Advanced Robotics Research, EarlyView.
Electrically controllable micromotors and microvehicles are developed by tuning the diffusion of the fuel. Self‐propelled micromotors using bubble propulsion show great promise for miniaturized devices with multiuse purposes such as cargo delivery and sensing. However, there is currently no method to electrically switch the micromotors on or off. Here,
Hugo Severinsson, Eswaran Murugasen, Jose G. Martinez, Edwin W. H. Jager   +3 more
wiley   +1 more source