Laboratory Excitation of the Kelvin‐Helmholtz Instability in an Ionospheric‐Like Plasma

Liu, Yu; Lei, Jiuhou; Yu, Peng; Ling, Yangrong; Zhang, Zhiqing Philippe; Liu, Pengfei; Cao, Jinxiang

doi:10.1029/2018gl077550

Cited by 13 publications

(5 citation statements)

References 49 publications

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“…and m = 4.5 × (0.4-0.8) ≈ 3 (Perez et al 2006;Liu et al 2017). The characteristics of KHI are similar with those reported in an early paper (Liu et al 2018a), and the KHI is suppressed as the ion-neutral collision frequency increases. As discussed previously, the collisional viscosity induced by the ion-neutral collisions can suppress the KHI by decreasing the sheared electric field (Khomenko 2016).…”

supporting

confidence: 85%

“…Numerous electrostatic and electromagnetic instabilities can be excited by the sheared E × B flow (Amatucci 1999;Tejero et al 2011;DuBois et al 2013;Liu et al 2017). For example, the transverse sheared E × B flow has been observed to trigger instabilities in a broad band frequency range, such as Kelvin-Helmholtz instability (Peñano & Ganguli 2000;Liu et al 2018a), inhomogeneous energy-density driven instability (Ganguli & Palmadesso 1988;Koepke et al 1994;Liu et al 2018b), and electron-ion hybrid (EIH) instability (Amatucci 1999;DuBois et al 2013;Liu et al 2014). In the laboratory, the sheared E × B flow and electron density gradient were usually generated using a biased concentric ring electrode, and plasma instabilities such as KHI were excited in different collision regimes (Zhang et al 2023).…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of the Response of Sheared E × B Flow to Varying Ion–Neutral Collisions

Zhang,

Liu,

Lei

et al. 2023

ApJ

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Partially ionized plasma is a common occurrence in astrophysical and space environments. The emergence and development of plasma instabilities are significantly impacted by the inelastic collisions between the ions and neutrals in the partially ionized plasma, such as the charge exchange. In this study, the effect of the ion–neutral collisions on the sheared E × B flow was experimentally investigated. In the weak collision range, the shear-driven plasma instability, such as Kelvin–Helmholtz instability, was excited by the velocity-sheared flow. However, increasing ion–neutral collisions resulted in a decrease in the magnitude of the sheared E × B flow due to charge exchange–induced drag forces. Consequently, the Kelvin–Helmholtz instability is suppressed, and the Rayleigh–Taylor instability is triggered. The underlying mechanism was elucidated through experimental findings and numerical analysis. The result of this study proposes that a transition between the two modes occurred with increasing ion–neutral collision strength. It could be applied to the study of the solar chromosphere and prominence and planetary ionospheres, where plasma is partially ionized and the sheared E × B flow is often encountered.

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confidence: 85%

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Response of Sheared E × B Flow to Varying Ion–Neutral Collisions

Zhang,

Liu,

Lei

et al. 2023

ApJ

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“…The experiments were performed using a ground‐based space plasma simulation platform: Keda Space Plasma EXperiment (KSPEX), which aims to investigate the partially ionized plasma physics encountered in the ionospheric environment (Liu et al., 2016; Liu et al., 2017; Liu, Lei, Yu, Liu, et al., 2018; Liu, Lei, Yu, Ling, et al., 2018). The main section of KSPEX is a stainless‐steel vacuum chamber, which is 3.5 m long and 0.5 m in diameter.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Laboratory Evidence of a Pre‐Existing Instability That Can Enhance the Ionospheric Heating Efficiency

Ling

Lei

et al. 2021

Geophysical Research Letters

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Ionospheric heating by high-power high-frequency (HF) waves has been widely recognized as a powerful tool to modify the ionosphere (P. Bernhardt et al., 2010). Such modifications have practical applications in the radio-communications and the regulation of high energy electrons to protect spacecraft in geospace. On the other hand, interactions between the injected electromagnetic (EM) waves and the ionosphere can effectively turn the ionosphere into a plasma laboratory without walls, to explore fundamental physical processes of plasma in the near-Earth space environment. Therefore, since the 1970s, the heating experiments by ground-based powerful HF facilities sprang up all over the world, such as the Arecibo, EISCAT, SUDA and HAARP (Gordon & Carlson, 1974;Rietveld et al., 2000). Numerous scientific observations have been obtained with these facilities, along with theoretical explanations which have been commonly accepted (Rietveld et al., 2016;Streltsov et al., 2018).The parametric decay instability (PDI) is one of the most fundamental and predominant physical processes generated in the ionospheric heating experiment, which can convert the ground-transmitted incident pump wave into another high-frequency-wave mode (EM or electrostatic wave) and a low-frequency-wave mode (Fejer, 1979;Gurevich, 2007;Robinson, 1989;Wang et al., 2016). As consequences of energy and momentum conservation, these waves must allow frequency and wavenumber matching relations, that is, f H ± f L = f pump , k H ± k L = k pump , where the subscripts H, L, and pump refer to the high-frequency-wave mode, the simultaneous low-frequency-wave mode, and the incident pump wave, respectively. f is the

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“…Compared to a satellite mission or rocket campaign, laboratory experiments (Figure 18) have many advantages, such as reproducibility, controllability, diagonality, and reconfigurability. Liu Y et al (2018a, b) designed and performed controlled experiments to simulate the ionospheric collisional plasma environment, providing evidences that the low frequency plasma instabilities such as the Kelvin–Helmholtz instability (KHI) can be generated in an ionospheric‐like plasma. Through their experimental work, theoretical mechanisms can be more confidently applied to explain the excitation of ionospheric irregularities.…”

Section: Ionospheric Irregularity and Scintillationmentioning

confidence: 99%

Recent ionospheric investigations in China (2018–2019)

Liu

Wan

2020

Earth and Planetary Physics

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Key Points:Ionospheric observations have continuously accumulated with increasing GNSS receivers being installed q Studies of ionospheric climatology and space weather highlight new physical understanding q Study of ionospheric irregularities/scintillations reports interesting features q Abstract: Since the release of the 2018 National Report of China on ionospheric research ( Liu LB and Wan WX, 2018) to the Committee on Space Research (COSPAR), scientists from Mainland China have made many new fruitful investigations of various ionospheric-related issues. In this update report, we briefly introduce more than 130 recent reports ( [2018][2019]. The current report covers the following topics: ionospheric space weather, ionospheric structures and climatology, ionospheric dynamics and couplings, ionospheric irregularity and scintillation, modeling and data assimilation, and radio wave propagation in the ionosphere and sounding techniques. ΔV para (m/s) SYM-H (nT) V para (m/s) V para (m/s) ΔV para (m/s) Figure 2. (a) The SYM-H index on 13-17 July 2012. The blue line marks the storm onset (at 06:42 UT on 15 July); yellow and gray areas indicate the 24-hour storm-time and 24-hour quiet-time intervals. (b) The blue dots denote the storm-time equatorial field-aligned plasma drifts observed by C/NOFS with red curve representing median and red lines denoting upper and lower quartile values. (c) Same as panel (b), but for the 24-hour quiet time interval. (d) The difference between (b) and (c). (e-h) Same as panels (a-d), but for the case on 7-11 July 2012 where the 24-hour quiet and storm intervals start at 04:12 UT on 7 and 9 July, respectively, after Zhang R et al. (2018). Earth and Planetary Physics

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Laboratory Excitation of the Kelvin‐Helmholtz Instability in an Ionospheric‐Like Plasma

Cited by 13 publications

References 49 publications

Experimental Study of the Response of Sheared E × B Flow to Varying Ion–Neutral Collisions

Experimental Study of the Response of Sheared E × B Flow to Varying Ion–Neutral Collisions

Laboratory Evidence of a Pre‐Existing Instability That Can Enhance the Ionospheric Heating Efficiency

Recent ionospheric investigations in China (2018–2019)

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