Spatio-temporal Dynamics of Fast Electrons and Plasma Turbulence in an Inhomogeneous Flare Plasma

Vatagin, P. V.; Kudryavtsev, I. V.

doi:10.1134/s001679322108020x

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…Such a pitch‐angle reflection from the loss cone has been found by Inan et al. (1978), Lundin & Shkliar (1977) and described for EMIC waves in Grach and Demekhov (2020) as force bunching . This pitch‐angle increase is described by the second term on the right‐hand side of Equation : the direct influence of Lorentz force on the particle phase is strong for small p ⊥ and can exceed the inertial (or kinematic) bunching effect ∼Δ, the first term in Equation .…”

Section: Simulation Setup and Resultssupporting

confidence: 60%

“…Electrons with small initial pitch angles show a significant 〈Δα eq 〉 > 0 at the resonant energy that increases with time (with the resonant latitudes where the wave-packet intensity maximizes) from 1 to 1.5 MeV (see red regions in Figure 3e). Such a pitch-angle reflection from the loss cone has been found by Inan et al (1978), Lundin & Shkliar (1977) and described for EMIC waves in Grach and Demekhov (2020) as force bunching. This pitch-angle increase is described by the second term on the right-hand side of Equation 3: the direct influence of Lorentz force on the particle phase is strong for small p ⊥ and can exceed the inertial (or kinematic) bunching effect ∼Δ, the first term in Equation 3.…”

Section: Simulation Setup and Resultsmentioning

confidence: 61%

See 1 more Smart Citation

Relativistic Electron Precipitation by EMIC Waves: Importance of Nonlinear Resonant Effects

Grach

Artemyev

Демехов

et al. 2022

Geophysical Research Letters

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Section: Simulation Setup and Resultssupporting

confidence: 60%

Section: Simulation Setup and Resultsmentioning

confidence: 61%

Relativistic Electron Precipitation by EMIC Waves: Importance of Nonlinear Resonant Effects

Grach

Artemyev

Демехов

et al. 2022

Geophysical Research Letters

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“…Figures 3e, 3f, 4e, and 4f show that force bunching (Bortnik et al., 2022; Grach & Demekhov, 2020; Grach et al., 2021, 2022; Kitahara & Katoh, 2019; Lundin & Shkliar, 1977) is effective at

E={E}_{\text{min}}^{\text{SD}}

–

{E}_{\text{max}}^{\text{SD}}

: precipitation from small pitch angles near the loss cone is substituted by precipitation of electrons at higher α eq0 (see discussions in Grach et al., 2022; Hanzelka, Li, & Ma, 2023), which are precipitated due to interactions in the linear regime, with possible contributions from nonlinear phase trapping that is less effective for shorter packets (see discussions in Grach et al., 2022).…”

Section: Simulation Setup and Resultsmentioning

confidence: 99%

Electron Precipitation Driven by EMIC Waves: Two Types of Energy Dispersion

Grach,

Artemyev,

Demekhov

et al. 2024

Geophysical Research Letters

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Electromagnetic ion cyclotron (EMIC) waves can very rapidly and effectively scatter relativistic electrons into the atmosphere. EMIC‐driven precipitation bursts can be detected by low‐altitude spacecraft, and analysis of the fine structure of such bursts may reveal unique information about the near‐equatorial EMIC source region. In this study, we report, for the first time, observations of EMIC‐driven electron precipitation exhibiting energy, E, dispersion as a function of latitude (and hence L‐shell): two predominant categories exhibit dE/dL > 0 and dE/dL < 0. We interpret precipitation with dE/dL < 0 as due to the typical inward radial gradient of cold plasma density and equatorial magnetic field (∼65% of the statistics). Precipitation with dE/dL > 0 is interpreted as due to an outward radial gradient of the equatorial magnetic field, likely produced by energetic ions freshly injected into the ring current (∼35% of the statistics). The observed energy dispersion of EMIC‐driven electron precipitation was reproduced in simulations.

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“…The theoretical model for generation of harmonic emissions of Type III solar radio bursts in strongly inhomogeneous plasmas is proposed in [37]. In work [38], the evolution of the electron distribution function and the spectral energy density of Langmuir turbulence with a pulsed injection of electrons in an inhomogeneous flare plasma is studied.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations of a continuously injected relativistic electron beam relaxation into a plasma with large-scale density gradients

Annenkov¹,

Volchok²

2022

Preprint

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In this paper the influence of large-scale decreasing and increasing gradients of the density of magnetized plasma on the relaxation process of a continuously injected relativistic electron beam with an energy of 660 keV (𝑣 𝑏 = 0.9𝑐) and a pitch-angle distribution is studied using particle-in-cell numerical simulations. It is found that for the selected parameters in the case of a smoothly decreasing gradient and in a homogeneous plasma the formation of spatially limited plasma oscillations of large amplitude occurs. In such cases, modulation instability develops and a long-wave longitudinal modulation of the ion density is formed. In addition, the large amplitude of plasma waves accelerates plasma electrons to energies on the order of the beam energy. In the case of increasing and sharply decreasing gradients, a significant decrease in the amplitude of plasma oscillations and the formation of a turbulent ion density spectrum are observed. The possibility of acceleration of beam electrons to energies more than 2 times higher than the initial energy of the beam particles is also demonstrated. This process takes place not only during beam propagation in growing plasma density, but also in homogeneous plasma due to interaction of beam particles with plasma oscillations of large amplitude.

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Spatio-temporal Dynamics of Fast Electrons and Plasma Turbulence in an Inhomogeneous Flare Plasma

Cited by 6 publications

References 19 publications

Relativistic Electron Precipitation by EMIC Waves: Importance of Nonlinear Resonant Effects

Relativistic Electron Precipitation by EMIC Waves: Importance of Nonlinear Resonant Effects

Electron Precipitation Driven by EMIC Waves: Two Types of Energy Dispersion

Numerical simulations of a continuously injected relativistic electron beam relaxation into a plasma with large-scale density gradients

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