Article
Geosciences, Multidisciplinary
S. Teng, N. Liu, Q. Ma, X. Tao, W. Li
Summary: This study demonstrates that ring-like proton distributions can generate both magnetosonic (MS) waves and electromagnetic ion cyclotron (EMIC) waves, providing direct observational evidence for previous theoretical predictions. By comparing linear growth rates and proton distribution evolution, the study reveals the generation mechanisms and relationship between these waves.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
S. Teng, Q. Ma, X. Tao
Summary: By analyzing data from the Van Allen Probes, researchers have determined the global distribution of simultaneous occurrence of Magnetosonic (MS) and Electromagnetic ion cyclotron (EMIC) waves in the magnetosphere. Their study also quantitatively analyzes the combined effects of these waves on protons and electrons, showing the importance of high-frequency EMIC waves and intense MS waves for proton acceleration and electron loss. This research provides new insights into understanding the distribution of MS and EMIC waves and evaluating their combined effects on energetic particles.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
D. Nunn, X-J Zhang, D. Mourenas, A. Artemyev
Summary: Researchers analyzed statistics of lower-band chorus waves in the inner magnetosphere and found that moderately intense short wave packets can be formed by superposing two or more waves with a sufficiently large frequency difference near the magnetic equator.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Jiwon Choi, Dong-Hun Lee
Summary: Standing poloidal Alfven waves are excited by wave-particle interaction in the magnetosphere, with ultralow frequency radial oscillations. Through magnetohydrodynamic simulations, it has been shown that the long-lasting poloidal waves depend on the local Alfven frequency gradient being negligible. Two necessary conditions for the existence of persistent poloidal modes have been derived, which are consistent with statistical observations.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Mechanics
Nicholas Liu, Matthew Durey, John W. M. Bush
Summary: We present the results of a theoretical investigation on the stability of a hydrodynamic analogue of Landau levels, focusing on circular orbits formed when a millimetric droplet self-propels along the surface of a vibrating, rotating liquid bath. The stability diagram characterizing the critical memory at which circular orbits destabilize and the form of instability are elucidated. Our study explains the prevalence of resonant wobbling instabilities reported in prior experimental works, and explores the physical mechanism responsible for the onset of instability.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Geosciences, Multidisciplinary
Z. Y. Liu, B. Wang, Q. G. Zong, S. T. Yao, C. J. Pollock, G. Le
Summary: Understanding electron behavior in whistler waves is crucial for comprehending their role in energizing electrons in space. Observations indicate that whistler waves can effectively trap thermal electrons, causing them to bunch and rotate in perpendicular and parallel directions, respectively.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
A. J. Halford, K. Garcia-Sage, I. R. Mann, D. L. Turner, A. W. Breneman
Summary: On 7 January 2014, a solar storm caused compression of Earth's magnetosphere and resulted in the generation and enhancement of chorus waves. These waves induced the precipitation of electrons from 10 s eV to 100 s keV. This study provides observations of a low energy cutoff in the precipitation spectrum, which is accurately predicted by theoretical calculations using wave and plasma data from Van Allen Probe B. This is the first time a single spacecraft has demonstrated the accuracy of theoretical predictions for chorus wave-induced precipitation and its low energy cutoff.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Shan Wang, Daniel B. Graham, Xin An, Li Li, Qiu-Gang Zong, Xu-Zhi Zhou, Wen-Ya Li, Zhi-Yang Liu
Summary: This study investigates electrostatic waves in a magnetopause reconnection event, specifically focusing on their coupling with lower-frequency electromagnetic waves. The anisotropy of energized electrons in the reconnection exhaust excites whistler waves, which in turn modulates parallel electron beam-mode waves near the current sheet mid-plane. In the separatrix region, parallel propagating electrostatic waves associated with field-aligned electron beams and perpendicular propagating electron cyclotron harmonic waves with loss cone distributions exhibit modulation frequencies in the lower-hybrid wave frequency range. These findings enhance our understanding of the characteristics and mechanisms of electrostatic waves in reconnection.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Review
Engineering, Biomedical
A. G. Guex, N. Di Marzio, D. Eglin, M. Alini, T. Serra
Summary: Novel approaches that combine technology, biomaterial design, and cutting-edge cell culture have been increasingly recognized as important for advancing tissue engineering and regenerative medicine. Acoustic manipulation, which uses sound-induced forces to control cellular organization within a carrier matrix remotely, has emerged as a particularly promising method in the last decade. This manipulation has evolved from arranging micro- or nanoparticles in 2D to assembling multiple cell types or organoids into highly complex in vitro tissues.
MATERIALS TODAY BIO
(2021)
Article
Geosciences, Multidisciplinary
Yangyang Shen, Lunjin Chen, Xiao-Jia Zhang, Anton Artemyev, Vassilis Angelopoulos, Christopher M. Cully, H. Gordon James, Andrew W. Yau, Andrew D. Howarth, Jacob Bortnik, Jiashu Wu, Sheng Tian, Michael D. Hartinger, Martin Connors, Richard B. Horne
Summary: The study on ducted chorus waves suggests that they may play a crucial role in driving relativistic electron precipitation. This observation provides important insights into the transport process of electrons from the magnetosphere to the atmosphere.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
He Zhang, Zhihong Zhong, Rongxin Tang, Xiaohua Deng, Haimeng Li, Dedong Wang
Summary: The study reveals the presence of quasi-periodic whistler-mode waves at the center of a macroscale magnetic hole near Earth's magnetopause, corresponding to electron temperature anisotropy. These waves are accompanied by a significant ultra-low frequency wave of the background magnetic field, exacerbating the evolution of the magnetic hole and contributing to the formation of electron pitch angle distribution.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Mechanics
Andrey Pototsky, Alexander Oron, Michael Bestehorn
Summary: We find that a small floating liquid drop has two stable shapes under terrestrial gravity, both with different radii of the triple-phase contact line. Static stability analysis shows that both shapes could be stable if the drop volume is below a certain critical value. Experiments demonstrate the existence of multiple contact line radii for floating water drops on commercial oil.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Multidisciplinary
Yang Chang, Wang ZongQiang, Xiao FuLiang, He ZhaoGuo, Xie YanQiong, Zhang Sai, He YiHua, Liu Si, Zhou QingHua
Summary: During the geomagnetic storm in September 2015, the Van Allen Probes observed enhanced EMIC waves, a decrease in fluxes of tens of keV protons, and a significant increase in precipitating protons at ionospheric altitudes.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Mitsunori Ozaki, Satoshi Yagitani, Kazuo Shiokawa, Yoshimasa Tanaka, Yasunobu Ogawa, Keisuke Hosokawa, Yoshiya Kasahara, Yusuke Ebihara, Yoshizumi Miyoshi, Kousuke Imamura, Ryuho Kataoka, Shin-ichiro Oyama, Teppei Chida, Akira Kadokura
Summary: Flash aurora affected by an isolated chorus element can be a useful ionospheric indicator, with the contraction time increasing more than the expansion time in patchy auroral variations. The contraction time particularly depends on higher-frequency chorus waves due to cyclotron resonance with lower-energy electrons.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Mechanics
S. Dehe, M. Hartmann, A. Bandopadhyay, S. Hardt
Summary: The instability of the interface between a dielectric and conducting liquid under a spatially homogeneous interface-normal time-periodic electric field is studied. Experimental and theoretical methods are used to investigate the spatial structure of the excited Faraday waves and the influence of liquid viscosities on the instability. The study confirms good agreement with theoretical predictions and provides insights into controlling electrostatically driven instabilities.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Multidisciplinary Sciences
Sung-Ha Hong, Jean-Baptiste Gorce, Horst Punzmann, Nicolas Francois, Michael Shats, Hua Xia
Article
Multidisciplinary Sciences
Jean-Baptiste Gorce, Konstantin Y. Bliokh, Hua Xia, Nicolas Francois, Horst Punzmann, Michael Shats
Summary: This study reports self-guided propulsion of fast-spinning magnetic particles on a liquid surface, forming composite spinner-vortex quasiparticles with nontrivial dynamics. These spinner-vortices are attracted and dynamically trapped near boundaries, propagating along any shaped wall like liquid wheels. The propulsion velocity and distance to the wall are controlled by the spinner's angular velocity through balance between forces.
Article
Physics, Multidisciplinary
M. Davoodianidalik, H. Punzmann, H. Kellay, H. Xia, M. Shats, N. Francois
Summary: This study provides experimental evidence for the existence of fluctuation-induced forces mediated by turbulent fluctuations in confined turbulence. The strength of this long-range interaction is dependent on the wall separation and energy injection rate in the turbulent flow. The mechanism of force generation is rooted in the nontrivial fluid-wall coupling, where coherent flow structures are guided by the cavity walls.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Konstantin Y. Bliokh, Horst Punzmann, Hua Xia, Franco Nori, Michael Shats
Summary: This article introduces the fundamental concepts of spin and momentum in quantum particles or fields, and their specific manifestations in wave fields. It demonstrates, through experiments, the natural generation of the Belinfante-Rosenfeld construction in gravity waves and explores the universality of these concepts and the significance of a new research platform.
Article
Chemistry, Physical
F. M. Schaller, H. Punzmann, G. E. Schroeder-Turk, M. Saadatfar
Summary: This paper explains the observations of a study on the X-ray computed tomography of granular ellipsoidal packings using a fundamental theoretical relationship for mixture distributions. The main finding is that the bi-disperse ellipsoidal packings studied can be interpreted as a mixture of two uncorrelated mono-disperse packings, insensitive to the compaction protocol.
Article
Physics, Fluids & Plasmas
Mahdi Davoodianidalik, Hamid Kellay, Nicolas Francois
Summary: This study reveals the emergence of a fluctuation-induced force observed in wave-driven turbulence, which is influenced by the energy and anisotropy of the wave motion. The results contribute to the research on aggregation processes in the presence of turbulence and the accumulation of plastic debris in coastal marine ecosystems, as well as the modeling of planetary formation.
