Alteration of Particle Drift Resonance Dynamics Near Poloidal Mode Field Line Resonance Structures

Degeling, A. W.; Rankin, R.; Wang, Y.; Shi, Quanqi; Zong, Q.

doi:10.1029/2019ja026946

Cited by 17 publications

(19 citation statements)

References 65 publications

(103 reference statements)

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“…Recent electron PSD compilations measured from both the Relativistic Electron‐Proton Telescope (REPT; Baker, Kanekal, Hoxie, Batiste, et al, ) and the MagEIS instruments on board the Van Allen Probes can be found, for instance, in Zhao et al () and Boyd et al (). Analytic solutions are possible only in simple configuration; for example, Degeling et al () in this collection calculate analytically ULF wave fields and drifting electron fluxes near a poloidal mode field line resonance in a dipole field.…”

Section: Particle Acceleration and Transport In The Inner And Outer Zmentioning

confidence: 99%

Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions

et al. 2020

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The past decade transformed our observational understanding of energetic particle processes in near‐Earth space. An unprecedented suite of observational systems was in operation including the Van Allen Probes, Arase, Magnetospheric Multiscale, Time History of Events and Macroscale Interactions during Substorms, Cluster, GPS, GOES, and Los Alamos National Laboratory‐GEO magnetospheric missions. They were supported by conjugate low‐altitude measurements on spacecraft, balloons, and ground‐based arrays. Together, these significantly improved our ability to determine and quantify the mechanisms that control the buildup and subsequent variability of energetic particle intensities in the inner magnetosphere. The high‐quality data from National Aeronautics and Space Administration's Van Allen Probes are the most comprehensive in situ measurements ever taken in the near‐Earth space radiation environment. These observations, coupled with recent advances in radiation belt theory and modeling, including dramatic increases in computational power, have ushered in a new era, perhaps a “golden era,” in radiation belt research. We have edited a Journal of Geophysical Research: Space Science Special Collection dedicated to Particle Dynamics in the Earth's Radiation Belts in which we gather the most recent scientific findings and understanding of this important region of geospace. This collection includes the results presented at the American Geophysical Union Chapman International Conference in Cascais, Portugal (March 2018) and many other recent and relevant contributions. The present article introduces and review the context, current research, and main questions that motivate modern radiation belt research divided into the following topics: (1) particle acceleration and transport, (2) particle loss, (3) the role of nonlinear processes, (4) new radiation belt modeling capabilities and the quantification of model uncertainties, and (5) laboratory plasma experiments.

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Section: Particle Acceleration and Transport In The Inner And Outer Zmentioning

confidence: 99%

Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions

et al. 2020

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“…These ULF waves, especially their poloidal-mode branches with electric field oscillations in the azimuthal direction, can accelerate or decelerate charged particles as they follow magnetic gradient and/or curvature drift orbits around Earth. In other words, this process provides an important energy source for particle acceleration and transportation in the Van Allen radiation belts Liu et al, 2016;Mann et al, 2016;Sarris et al, 2017;Hao et al, 2019;Degeling et al, 2019). This resonant process is called drift resonance (Southwood and Kivelson, 1981;Southwood and Kivelson, 1982;, during which particles can have a net energy gain (or loss, depending on the phase difference) from the ULF waves.…”

Section: Introductionmentioning

confidence: 99%

Drift‐Bounce Resonance Between Charged Particles and Ultralow Frequency Waves: Theory and Observations

Zhu

Zhou

et al. 2020

JGR Space Physics

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Ultralow frequency (ULF) waves have long been known to resonate with magnetospheric charged particles through their drift and bounce motions. Most research interest has focused on the resonance with drift motion, which can accelerate charged particles at very high energies. The role of the bounce motion, especially for particles with lower energies, has attracted less attention so far. Here we start from the general theory of wave-particle interactions to predict the characteristic, observable signatures of drift-bounce resonance. Such signatures can be described in the particle pitch angle spectrum as a series of inclined stripes, with the inclination angle depending on the latitude of the observing spacecraft. Each stripe is also twisted at two conjugated pitch angles, suggesting significant phase shifts across resonant pitch angles. These predicted signatures are found consistent with observations from the THEMIS (Time History of Events and Macroscale Interactions during Substorms) spacecraft, and therefore provide an identification of drift-bounce resonance together with a validated picture over the importance of particle's bounce motion in the ULF wave-particle interactions.

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“…Therefore, reverse-boomerang stripes on electron pitch angle distributions can be observed by Van Allen channels. [Li et al, 2018] A nonlinear theory of drift resonance has been developed to formulate the charged particle motion due to the ULF wave of a large amplitude [Li et al, 2018, 2020, Degeling et al, 2019. Observable signatures such as rolled-up structures in the energy spectrum are predicted.…”

Section: Ulf Waves' Interaction With Ionospheric Outflow: Mass Spectrometermentioning

confidence: 99%

“…In the traditional drift or drift-bounce resonance theory, the weak ULF wave-particle interaction is assumed and charged particle trajectories are unperturbed, thus, a linearization theory can be applied. However, the observed ULF waves in the magnetosphere are usually with a larger magnitude, therefore, the traditional theory needs to be extended into a nonlinear regime since charged particle trajectories are strongly disturbed [Li et al, 2018, Degeling et al, 2019. In this section, the concepts on the nonlinear and multiple drift/drift-bounce resonances will be presented.…”

Section: Nonlinear and Multiple Drift/drift -Bounce Resonancesmentioning

confidence: 99%

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Magnetospheric Response to Solar Wind Forcing: ULF Wave – Particle Interaction Perspective

Zong

2021

Preprint

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Abstract. Solar wind forcing, e.g. interplanetary shock and/or solar wind dynamic pressure pulses impact on the Earth’s magnetosphere manifests many fundamental important space physics phenomena including producing electromagnetic waves, plasma heating and energetic particle acceleration. This paper summarizes our present understanding of the magnetospheric response to solar wind forcing in the aspects of radiation belt electrons, ring current ions and plasmaspheric plasma physics based on in situ spacecraft measurements, ground-based magnetometer data, MHD and kinetic simulations. Magnetosphere response to solar wind forcing, is not just a “one-kick” scenario. It is found that after the impact of solar wind forcing on the Earth’s magnetosphere, plasma heating and energetic particle acceleration started nearly immediately and could last for a few hours. Even a small dynamic pressure change of interplanetary shock or solar wind pressure pulse can play a non-negligible role in magnetospheric physics. The impact leads to generate series kind of waves including poloidal mode ultra-low frequency (ULF) waves. The fast acceleration of energetic electrons in the radiation belt and energetic ions in the ring current region response to the impact usually contains two contributing steps: (1) the initial adiabatic acceleration due to the magnetospheric compression; (2) followed by the wave-particle resonant acceleration dominated by global or localized poloidal ULF waves excited at various L-shells. Generalized theory of drift and drift-bounce resonance with growth or decay localized ULF waves has been developed to explain in situ spacecraft observations. The wave related observational features like distorted energy spectrum, boomerang and fishbone pitch angle distributions of radiation belt electrons, ring current ions and plasmaspheric plasma can be explained in the frame work of this generalized theory. It is worthy to point out here that poloidal ULF waves are much more efficient to accelerate and modulate electrons (fundamental mode) in the radiation belt and charged ions (second harmonic) in the ring current region. The results presented in this paper can be widely used in solar wind interacting with other planets such as Mercury, Jupiter, Saturn, Uranus and Neptune, and other astrophysical objects with magnetic fields.

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Alteration of Particle Drift Resonance Dynamics Near Poloidal Mode Field Line Resonance Structures

Cited by 17 publications

References 65 publications

Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions

Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions

Drift‐Bounce Resonance Between Charged Particles and Ultralow Frequency Waves: Theory and Observations

Magnetospheric Response to Solar Wind Forcing: ULF Wave – Particle Interaction Perspective

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