Slow drift mirror kinetic instability at a finite electron temperature in a nonmaxwellian space plasma

Feygin, F. Z.; Khabazin, Yu. G.

doi:10.1134/s0016793214060103

“…The magnetic strength varies antiphase with the plasma density inside the structure (Tsurutani et al, 2011). Mirror modes are normally stationary in the plasma flow frame, but drift‐mirror modes are able to be excited in the nonuniform plasma such as the magnetosphere (Feygin & Khabazin, 2014; Hasegawa, 1969; Klimushkin & Chen, 2006). They often look like peaks, dips (hereafter referred to as magnetic holes), or quasi‐sinusoidal fluctuations (Balikhin et al, 2010; Yao et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Statistical Properties of Sub‐Ion Magnetic Holes in the Solar Wind at 1 AU

Wang

¹

,

Zhang

²

,

Xiao

³

et al. 2020

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Sub-ion magnetic holes are rich in the terrestrial plasma sheet and magnetosheath. Here, we statistically investigate 60 sub-ion magnetic holes in the solar wind at 1 AU using the high-resolution data measured by the Magnetospheric Multiscale mission. We find that they are observed with a duration of 0.1-0.5 s, and the lengths of their cross-section are~0.1-0.6 ion gyroradius. These structures prefer to occur in the slow solar wind with a weak ambient magnetic field strength. They also prefer to occur in the marginally mirror stable or unstable environments. Electron vortices as well as an enhancement of the electron perpendicular temperature and electron fluxes at~90°pitch angle tend to be observed inside some magnetic holes with a large ambient magnetic field strength. By contrast, there are no clearly observational electron vortices as well as the electron fluxes at~90°pitch angle inside some magnetic holes with a weak ambient magnetic strength. The current density with a value of~10-50 nA/m 2 reveals that the corresponding maximum electron velocity is <10 km/s inside some magnetic holes, lower than the level of the observational electron velocity noise, which prevents the detection of the weak electron vortex. We suggest that electron vortices exist inside all the sub-ion magnetic holes in the solar wind. The generation of these sub-ion magnetic holes can be explained by the electron magnetohydrodynamics soliton and the electron vortex magnetic hole.

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“…The existence of drift compressional waves in the magnetosphere was confirmed [Chelpanov et al, 2016[Chelpanov et al, , 2018Rubtsov et al, 2018;Mager et al, 2019]. The ability of ULF waves to efficiently accelerate particles in the ring current and radiation belts was demonstrated [Zong et al, 2009[Zong et al, , 2012[Zong et al, , 2017Mann et al, 2013;Claudepierre et al, 2013;Foster et al, 2015;Hao et al, 2014Hao et al, , 2019Ren et al, 2017;Ren et al, 2019;Simms et al, 2021]. Understanding the structure of the radiation belts caused by diffusion across magnetic shells related to wave-particle resonance underwent significant advances Mann et al, 2012;Su et al, 2015;Lejosne and Kollmann, 2020].…”

Section: Discussionmentioning

confidence: 98%

“…For the energies characteristic of the outer radiation belt electrons (from several hundred kiloelectronvolt to several megaelectronvolt), drift resonance condition (21) can hold only for relatively low azimuthal wave numbers: m<10 for the Pc5 frequency range. This means that the waves responsible for the killer electron acceleration should have an external origin associated with the solar wind, like the solar wind dynamic pressure impulses [Potapov, 2013;Foster et al, 2015] and the Kelvin-Helmholtz instability [Mathie and Mann, 2001]. Such waves can also penetrate directly from the solar wind [Potapov et al, 2012[Potapov et al, , 2013.…”

Section: The Role Of Ulf Waves In the Acceleration Of Radiation Belt Particlesmentioning

confidence: 99%

“…The simplest method of the electron acceleration by ULF waves can be summarized in the following way: a wave is excited by a source, an electron gets into a drift resonance with the wave due to interaction with its azimuthal electric field; the electron energy linearly increases with time according to (31). A number of articles have experimentally demonstrated this mechanism [Zong et al, 2009[Zong et al, , 2012Mann et al, 2013;Claudepierre et al, 2013;Foster et al, 2015;Hao et al, 2014Hao et al, , 2019. In this case, the wave source is usually associated with a solar wind pressure impulse.…”

Section: Acceleration In Drift Resonancementioning

confidence: 99%

“…Moreover, the instability threshold decreases with increasing pressure. The finite electron pressure and the finite Larmor radius of ions significantly influence the mirror instability development [Pokhotelov et al, 2000;Pokhotelov et al, 2005;Klimushkin and Chen, 2006;Feygin and Khabazin, 2014].…”

Section: Drift-mirror Modementioning

confidence: 99%

See 2 more Smart Citations

Interaction between long-period ULF waves and charged particle in the magnetosphere: theory and observations (overview)

Klimushkin

¹

,

Mager

²

,

Челпанов

³

et al. 2021

Solar-Terrestrial Physics

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The paper reviews the current state of the problem of interaction between long-period ultra-low-frequency (ULF) waves and high-energy particles. We consider elements of the theory of energy exchange between waves and particles, particle transport across magnetic shells under the influence of the electromagnetic field of a wave, the acceleration of radiation belt particles by both resonant and non-resonant mechanisms. We examine the mechanisms of generation of azimuthally-small-scale ULF waves due to instabilities arising from the wave–particle resonance. The cases of Alfvén, drift-compressional, and drift-mirror waves are analyzed. It is noted that due to the lack of a detailed theory of drift-mirror modes, the possibility of their existence in the magnetosphere cannot be taken as a proven fact. We summarize experimental data on the poloidal and compression ULF waves generated by unstable populations of high-energy particles. We investigate the mechanisms of modulation of energetic particle fluxes by ULF waves and possible observational manifestations of such modulation. Methods of studying the structure of waves across magnetic shells by recording fluxes of resonant particles with a finite Larmor radius are discussed.

show abstract

Interaction between long-period ULF waves and charged particle in the magnetosphere: theory and observations (overview)

Klimushkin

¹

,

Mager

²

,

Челпанов

³

et al. 2021

Solnechno-Zemnaya Fizika

0

View full text Add to dashboard Cite

The paper reviews the current state of the problem of interaction between long-period ultra-low-frequency (ULF) waves and high-energy particles. We consider elements of the theory of energy exchange between waves and particles, particle transport across magnetic shells under the influence of the electromagnetic field of a wave, the acceleration of radiation belt particles by both resonant and non-resonant mechanisms. We examine the mechanisms of generation of azimuthally-small-scale ULF waves due to instabilities arising from the wave–particle resonance. The cases of Alfvén, drift-compressional, and drift-mirror waves are analyzed. It is noted that due to the lack of a detailed theory of drift-mirror modes, the possibility of their existence in the magnetosphere cannot be taken as a proven fact. We summarize experimental data on the poloidal and compression ULF waves generated by unstable populations of high-energy particles. We investigate the mechanisms of modulation of energetic particle fluxes by ULF waves and possible observational manifestations of such modulation. Methods of studying the structure of waves across magnetic shells by recording fluxes of resonant particles with a finite Larmor radius are discussed.

show abstract

Slow drift mirror kinetic instability at a finite electron temperature in a nonmaxwellian space plasma

Cited by 3 publications

References 14 publications

Statistical Properties of Sub‐Ion Magnetic Holes in the Solar Wind at 1 AU

Statistical Properties of Sub‐Ion Magnetic Holes in the Solar Wind at 1 AU

Interaction between long-period ULF waves and charged particle in the magnetosphere: theory and observations (overview)

Interaction between long-period ULF waves and charged particle in the magnetosphere: theory and observations (overview)

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