Vortex Generation and Auroral Response to a Solar Wind Dynamic Pressure Increase: Event Analyses

Zhao, Jinyan; Shi, Quanqi; Tian, Anmin; Shen, Xiao-Chen; Weygand, J. M.; Wang, Huizi; Yao, Shutao; Ma, Xiao; Degeling, A. W.; Rae, I. J.; Zhang, Hui; Zhang, Xiaojia; Bai, Shaochun; Shang, Wensai; Park, Jongsun

doi:10.1029/2020ja028753

Cited by 6 publications

(3 citation statements)

References 79 publications

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“…A model is summarized and presented in Shi et al (2020). Later on, Zhao et al (2021) showed observational evidence for different variations in auroral intensity caused by FACs under solar wind dynamic pressure increase. Note that the illustration of the global response to sudden changes in the solar wind dynamic pressure proposed by Shi et al (2020) was mainly based on observations in the magnetosphere.…”

Section: Summary and Discussionmentioning

confidence: 99%

Ionospheric Flow Vortex Induced by the Sudden Decrease in the Solar Wind Dynamic Pressure

Jin,

Moen,

Spicher

et al. 2023

JGR Space Physics

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Abrupt changes in the solar wind dynamic pressure can greatly affect the Earth's magnetosphere‐ionosphere system. We present an ionospheric flow vortex in the morning sector during the sudden decrease in the solar wind dynamic pressure. The flow vortex was clearly observed by both the Hankasalmi radar and the azimuthal scan mode of the European Incoherent Scatter (EISCAT) Svalbard Radar (ESR). The flow vortex was first seen in the eastern field of view (FOV) of the Hankasalmi radar, and then propagated poleward and westward into the FOV of the ESR. During the passage of the flow vortex, a gradual decrease of electron density was observed by the field‐aligned ESR 42 m antenna. When the equatorward directed ionospheric flow reached the ESR site, weak and visible increases in the electron density and electron temperature were observed. This impact was likely caused by soft electron precipitation associated with the clockwise flow vortex and upward field‐aligned current. The azimuthal scan mode of the ESR 32 m radar at low elevation angle (30°) allowed us to measure key ionospheric parameters over a larger area (6° in latitude and 120° in azimuthal angle). The latitudinal scan of the electron temperature was used to proxy the equatorward auroral boundary, which shows that the flow vortex was located in the subauroral region. We further demonstrated that it is possible to study the weak increase of electron density by using GPS total electron content (TEC) data. A minor TEC increase was observed near the center of the flow vortex.

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Section: Summary and Discussionmentioning

confidence: 99%

Ionospheric Flow Vortex Induced by the Sudden Decrease in the Solar Wind Dynamic Pressure

Jin,

Moen,

Spicher

et al. 2023

JGR Space Physics

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“…Moving forward, it is imperative to conduct additional investigations and engage in theoretical analysis to advance our understanding of the intricate details of black auroras and their response to FLRs triggered by dynamic pressure pulses in the solar wind [29][30][31][32]. Additionally, we are eager to explore the response of auroras to plasma flow vortices and other related phenomena [33][34][35][36][37]. We plan to continue our research by gathering more observations from a variety of sources, including additional satellite and groundbased measurements, to improve our understanding of this intriguing and enigmatic phenomenon.…”

Section: Discussionmentioning

confidence: 99%

Poleward-Moving Black Aurora Associated with Impulse-Excited Field-Line Resonances in the Dawnside Sector: THEMIS and Ground Observations

et al. 2023

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The black aurora is a distinct phenomenon characterized by spatially well-defined regions where the diffuse auroral luminosity decreases notably. Typically, black auroras present as arcs moving at lower velocities, patches with higher moving speeds, and arc segments. However, the mechanism behind black auroras remains unclear. In this paper, we present a novel observation of a poleward-moving black auroral arc associated with impulse-excited field-line resonances in the dawnside sector from the multi-spacecraft THEMIS (Time History of Events and Macroscale Interactions during Substorms) mission, equivalent ionospheric currents, and a conjugated all-sky imager. The field-line resonance velocities exhibit periodic vorticity, which correspond to periodic poleward-moving bands of enhanced FACs. Based on the relatively large reduction in luminosity, we conclude that the poleward-moving black auroral arc was most likely caused by downward FACs associated with field-line resonances.

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“…Vortices are ubiquitous structures in astrophysical and space plasma environments such as the Sun, the planetary magnetosheath, magnetosphere, and ionosphere (e.g., Brandt et al., 1988; Nykyri et al., 2006; H. Zhang et al., 2011; J. Zhao et al., 2021). They play leading roles in the transfer and exchange of mass and energy.…”

Section: Introductionmentioning

confidence: 99%

Ion‐Vortex Magnetic Hole With Reversed Field Direction in Earth's Magnetosheath

Yao

Zong

et al. 2023

JGR Space Physics

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They play leading roles in the transfer and exchange of mass and energy. For instance, solar wind plasmas are transported into the planetary magnetosphere by rolled-up Kelvin-Helmholtz vortices (e.g., Hasegawa et al., 2004;Kivelson & Pu, 1984). Large vortices can also be produced in the planetary magnetosheath by disturbed flows, which could induce reconnection, and consequently, efficient plasma transport (e.g.,

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Vortex Generation and Auroral Response to a Solar Wind Dynamic Pressure Increase: Event Analyses

Abstract: Positive solar wind dynamic pressure (SW P dyn) pulse events, some originate from various solar wind structures, including the leading edge of HPS (

Cited by 6 publications

References 79 publications

Ionospheric Flow Vortex Induced by the Sudden Decrease in the Solar Wind Dynamic Pressure

Ionospheric Flow Vortex Induced by the Sudden Decrease in the Solar Wind Dynamic Pressure

Poleward-Moving Black Aurora Associated with Impulse-Excited Field-Line Resonances in the Dawnside Sector: THEMIS and Ground Observations

Ion‐Vortex Magnetic Hole With Reversed Field Direction in Earth's Magnetosheath

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