Relevant bibliographies by topics / Phase Angle Bunching

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  2. Dissertations / Theses

Academic literature on the topic 'Phase Angle Bunching'

Author: Grafiati
Published: 6 September 2023
Last updated: 31 July 2025

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Journal articles on the topic "Phase Angle Bunching"

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Kleinherenbrink, Marcel, Anton Korosov, Thomas Newman, et al. "Estimating instantaneous sea-ice dynamics from space using the bi-static radar measurements of Earth Explorer 10 candidate Harmony." Cryosphere 15, no. 7 (2021): 3101–18. http://dx.doi.org/10.5194/tc-15-3101-2021.

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Abstract. This article describes the observation techniques and suggests processing methods to estimate dynamical sea-ice parameters from data of the Earth Explorer 10 candidate Harmony. The two Harmony satellites will fly in a reconfigurable formation with Sentinel-1D. Both will be equipped with a multi-angle thermal infrared sensor and a passive radar receiver, which receives the reflected Sentinel-1D signals using two antennas. During the lifetime of the mission, two different formations will be flown. In the stereo formation, the Harmony satellites will fly approximately 300 km in front an
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Albert, Jay M., Anton Artemyev, Wen Li, Longzhi Gan, and Qianli Ma. "Equations of Motion Near Cyclotron Resonance." Frontiers in Astronomy and Space Sciences 9 (June 16, 2022). http://dx.doi.org/10.3389/fspas.2022.910224.

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This work compares several versions of the equations of motion for a test particle encountering cyclotron resonance with a single, field-aligned whistler mode wave. The gyro-averaged Lorentz equation produces both widespread phase trapping (PT) and “positive phase bunching” of low pitch angle electrons by large amplitude waves. Approximations allow a Hamiltonian description to be reduced to a single pair of conjugate variables, which can account for PT as well as phase bunching at moderate pitch angle, and has recently been used to investigate this unexpected bahavior at low pitch angle. Here,
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Vargas, Alexander D., Anton V. Artemyev, Xiao-Jia Zhang, and Jay Albert. "Role of “positive phase bunching” effect for long-term electron flux dynamics due to resonances with whistler-mode waves." Physics of Plasmas 30, no. 11 (2023). http://dx.doi.org/10.1063/5.0169278.

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Resonant interactions with electromagnetic whistler-mode waves are a primary driver of energetic electron dynamics in the Earth's radiation belts. The most intense waves can resonate with electrons nonlinearly, and effects of such nonlinear resonant interactions significantly differ from the classical quasi-linear diffusion. There have been continuous efforts on the theoretical investigation and implementation of these effects into radiation belt models, but not all nonlinear effects have been revealed yet. The two most investigated effects are phase trapping and phase bunching, which are resp
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Gan, Longzhi, Wen Li, Miroslav Hanzelka, Qianli Ma, Jay M. Albert, and Anton V. Artemyev. "Electron precipitation caused by intense whistler-mode waves: combined effects of anomalous scattering and phase bunching." Frontiers in Astronomy and Space Sciences 10 (December 22, 2023). http://dx.doi.org/10.3389/fspas.2023.1322934.

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Resonant interactions with whistler-mode waves are a crucial mechanism that drives the precipitation of energetic electrons. Using test particle simulations, we investigated the impact of nonlinear interactions of whistler-mode waves on electron precipitation across a broad energy range (10 keV- 1 MeV). Specifically, we focused on the combined effects of conventional phase bunching and anomalous scattering, which includes anomalous trapping and positive bunching. It is shown that anomalous scattering transports electrons away from the loss cone and the only process directly causing precipitati
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Albert, Jay M., Anton Artemyev, Wen Li, Longzhi Gan, and Qianli Ma. "Analytical results for phase bunching in the pendulum model of wave-particle interactions." Frontiers in Astronomy and Space Sciences 9 (August 11, 2022). http://dx.doi.org/10.3389/fspas.2022.971358.

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Radiation belt electrons are strongly affected by resonant interactions with cyclotron-resonant waves. In the case of a particle passing through resonance with a single, coherent wave, a Hamiltonian formulation is advantageous. With certain approximations, the Hamiltonian has the same form as that for a plane pendulum, leading to estimates of the change at resonance of the first adiabatic invariant I, energy, and pitch angle. In the case of large wave amplitude (relative to the spatial variation of the background magnetic field), the resonant change in I and its conjugate phase angle ξ are not
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Zhou, Su, and Yongzhi Cai. "Influence of Initial Proton Energy on the Nonlinear Interactions Between Ring Current Protons and He+ Band EMIC Waves." Journal of Geophysical Research: Space Physics 129, no. 10 (2024). http://dx.doi.org/10.1029/2024ja032954.

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AbstractThe energy of ring current protons is believed to influence the pitch angle scattering due to electromagnetic ion cyclotron (EMIC) waves and is typically analyzed using quasi‐linear theory. However, nonlinear behavior becomes significant as the wave amplitude intensifies. In this study, we aim to explore how the nonlinear behavior depends on the initial proton energy under various background plasma density conditions. The frequency of EMIC waves is 0.96ΩHe (where ΩHe is the gyrofrequency of He+ at the equator). It is found that the higher energy protons with nonlinear phase trapping ex
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Artemyev, Anton V., Anatoly I. Neishtadt, Alexei A. Vasiliev, Xiao-Jia Zhang, Didier Mourenas, and Dmitri Vainchtein. "Long-term dynamics driven by resonant wave–particle interactions: from Hamiltonian resonance theory to phase space mapping." Journal of Plasma Physics 87, no. 2 (2021). http://dx.doi.org/10.1017/s0022377821000246.

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In this study we consider the Hamiltonian approach for the construction of a map for a system with nonlinear resonant interaction, including phase trapping and phase bunching effects. We derive basic equations for a single resonant trajectory analysis and then generalize them into a map in the energy/pitch-angle space. The main advances of this approach are the possibility of considering effects of many resonances and to simulate the evolution of the resonant particle ensemble on long time ranges. For illustrative purposes we consider the system with resonant relativistic electrons and field-a
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Zhou, Su, Xiaoli Luan, Shangchun Teng, Zhiwei Wang, and Shengting Zhu. "Nonlinear Effects of Ring Current Protons: Impacts of EMIC Wave Amplitude, Frequency, and Propagation Angle." Journal of Geophysical Research: Space Physics 130, no. 3 (2025). https://doi.org/10.1029/2024ja033593.

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AbstractNonlinear cyclotron resonance is known to cause the scattering of ring current protons to deviate from the predictions of quasi‐linear theory, when wave‐induced motion dominates over adiabatic motion. This study employed a test‐particle simulation to investigate the nonlinear processes of ring current protons and their dependence on the amplitude, frequency, and wave normal angle ψ of electromagnetic ion cyclotron (EMIC) waves. As the equatorial pitch angle αeq increases, proton motion becomes dominated by the wave's electromagnetic force and responds nonlinearly. When wave‐induced mot
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Kamaletdinov, Sergei R., Ivan Y. Vasko, and Anton V. Artemyev. "Nonlinear electron scattering by electrostatic waves in collisionless shocks." Journal of Plasma Physics 90, no. 2 (2024). http://dx.doi.org/10.1017/s0022377824000217.

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We present a theoretical analysis of electron pitch-angle scattering by ion-acoustic electrostatic fluctuations present in the Earth's bow shock and, presumably, collisionless shocks in general. We numerically simulate electron interaction with a single wave packet to demonstrate the scattering through phase bunching and phase trapping and quantify electron pitch-angle scattering in dependence on the wave amplitude and wave normal angle to the local magnetic field. The iterative mapping technique is used to model pitch-angle scattering of electrons by a large number of wave packets, which have
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Hanzelka, Miroslav, Wen Li, and Qianli Ma. "Parametric analysis of pitch angle scattering and losses of relativistic electrons by oblique EMIC waves." Frontiers in Astronomy and Space Sciences 10 (April 19, 2023). http://dx.doi.org/10.3389/fspas.2023.1163515.

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This study analyzes the effects of electromagnetic ion cyclotron (EMIC) waves on relativistic electron scattering and losses in the Earth’s outer radiation belt. EMIC emissions are commonly observed in the inner magnetosphere and are known to reach high amplitudes, causing significant pitch angle changes in primarily >1 MeV electrons via cyclotron resonance interactions. We run test-particle simulations of electrons streaming through helium band waves with different amplitudes and wave normal angles and assess the sensitivity of advective and diffusive scattering behaviors to these two para
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Dissertations / Theses on the topic "Phase Angle Bunching"

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Kumar, Avnish. "Beamforming and Target Tracking Methods for Active RF Phased Array Seekers." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6174.

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The end game guidance and control of an interceptor for neutralization of a hypersonic vehicle or a maneuvering aerial target is a challenging problem. This problem can be addressed in two ways: through faster autopilot coupled with faster lateral error correction and through the use of better on-board homing sensor. The former demands not only sophisticated control and guidance algorithms, but also faster control mechanisms such as larger control surfaces driven through faster and bigger actuators, bulky reaction control systems or thrust vector control systems. All these options lead to incr
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