Characteristics of Electron Precipitation Directly Driven by Poloidal ULF Waves

Yin, Ze‐Fan; Zhou, X.‐Z.; Li, W.; Shen, Xiaochen; Rankin, R.; Liu, Ji; Hu, Zejun; Liu, Jianjun; Zong, Q.; Li, Li; Wang, Yong‐Fu

doi:10.1029/2022ja031163

Cited by 3 publications

(3 citation statements)

References 83 publications

(117 reference statements)

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“…It has also been shown that the poloidal‐mode waves can drive the electron precipitation within a wide energy range, although the Yin et al. (2023) study mainly focuses on more energetic electrons. It is needed for future works to study the relative roles of the FLR‐associated azimuthal and parallel electric fields in the electron precipitation driven by poloidal‐mode ULF waves.…”

Section: Discussionmentioning

confidence: 99%

“…During this event, however, the amplitude of the ground‐based magnetic field pulsations in the east‐west direction are larger than those in the north‐south direction, which indicates the dominance of poloidal‐mode waves. Since the direction of the poloidal‐mode wave‐carried electric field coincides with the electron drift motion, it has been proposed that the azimuthal electric field and its induced acceleration could play a role in the electron precipitation (Yin et al., 2023). It has also been shown that the poloidal‐mode waves can drive the electron precipitation within a wide energy range, although the Yin et al.…”

Section: Discussionmentioning

confidence: 99%

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Multi‐Band Periodic Poleward‐Moving Auroral Arcs at the Postdawn Sector: A Case Study

Yin,

Zhou,

et al. 2023

JGR Space Physics

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Poleward‐moving auroral arcs (PMAAs) with recurrence periods on the order of minutes have been established as a distinct form of auroral activities. Their origin and characteristics, especially those on the dayside, are less understood due to the paucity of observations. Here, we investigate a periodic PMAA event at the postdawn sector based on optical measurements from the high‐latitude Yellow River Station and magnetic measurements from multiple ground‐based stations. The optical observations demonstrate a long duration (∼2.5 hours) of the periodic auroral arcs at not only the well‐established red‐line but also the green‐ and the blue‐lines. This multi‐band feature, together with images at far‐ultraviolet wavelengths, demonstrates a wide energy range of precipitating electrons from hundreds of eV to several keV, with a characteristic energy of ∼2 keV. The auroral luminosity variations at different wavebands show a consistent periodicity within 1.67‐3mHz, which is also shown in the ground‐based magnetic pulsations. The auroral arc and magnetic field observations display signatures of field line resonance, which are likely driven by perturbations at the magnetopause boundary layer. These results complement our knowledge of the dayside periodic PMAAs and improve our understanding of their relationship with ultra‐low frequency waves.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Multi‐Band Periodic Poleward‐Moving Auroral Arcs at the Postdawn Sector: A Case Study

Yin,

Zhou,

et al. 2023

JGR Space Physics

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“…Besides, ULF waves can modulate the emission of lower‐band chorus waves and electrostatic electron cyclotron harmonic waves, periodically scattering energetic electrons into the loss cone, thereby giving rise to pulsating auroras (e.g., Li et al., 2023; Motoba et al., 2019; Motoba et al., 2021). ULF waves can also induce direct particle precipitation by altering the size of the loss cone (Rae et al., 2018) or the altitude of the mirror point (Yin, Zhou, Li, et al., 2023). Nonetheless, there is limited research on how ULF waves affect the formation of spatial periodic auroral structures.…”

Section: Introductionmentioning

confidence: 99%

Mesoscale Auroral Curls in Antarctica

Li,

Zong,

et al. 2024

Geophysical Research Letters

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The morphology and motion of auroras have been widely studied due to their indications on magnetospheric processes. Here, we report a new kind of “auroral curls,” which have wavelengths in the mesoscale (∼100 km) and propagate azimuthally. Utilizing data from the Chinese Antarctic Zhongshan Station (the all‐sky imager and the high‐frequency radar), the Active Magnetosphere and Planetary Electrodynamics Response Experiment and the Defense Meteorological Satellite Program, we analyze an event occurred on 23 April 2019. We find these curls are fine structures in the poleward boundary of multiple arcs. Corresponding field‐aligned currents manifest as a series of longitudinally arranged pairs, while ionospheric flow velocities nearby oscillate with periods in the Pc 5 band. Observational evidence suggests these curls are connected with ultra‐low frequency (ULF) waves, which opens the possibility of using auroras to globally image ULF waves.

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Large-scale magnetic field oscillations and their effects on modulating energetic electron precipitation

Qin,

Li,

et al. 2024

Front. Astron. Space Sci.

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In this study, we present simultaneous multi-point observations of magnetospheric oscillations on a time scale of tens of minutes (forced-breathing mode) and modulated whistler-mode chorus waves, associated with concurrent energetic electron precipitation observed through enhanced BARREL X-rays. Similar fluctuations are observed in X-ray signatures and the compressional component of magnetic oscillations, spanning from ∼9 to 12 h in MLT and 5 to 11 in L shell. Such magnetospheric oscillations covering an extensive region in the pre-noon sector have been suggested to play a potential role in precipitating energetic electrons by either wave scattering or loss cone modulation, showing a high correlation with the enhancement in X-rays. In this event, the correlation coefficients between chorus waves (smoothed over 8 min), ambient magnetic field oscillations and X-rays are high. We perform an in-depth quasi-linear modeling analysis to evaluate the role of magnetic field oscillations in modulating energetic electron precipitation in the Earth’s magnetosphere through modulating whistler-mode chorus wave amplitude, resonance condition between chorus waves and electrons, as well as loss cone size. Model results further show that the modulation of chorus wave amplitude plays a dominant role in modulating the electron precipitation. However, the effect of the modulation in the resonant energy between chorus waves and energetic electrons due to the background magnetic field oscillations cannot be neglected. The bounce loss cone modulation, affected by the magnetic oscillations, has little influence on the electron precipitation modulation. Our results show that the low frequency magnetospheric oscillations could play a significant role in modulating the electron precipitation through modulating chorus wave intensity and the resonant energy between chorus waves and electron.

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Characteristics of Electron Precipitation Directly Driven by Poloidal ULF Waves

Cited by 3 publications

References 83 publications

Multi‐Band Periodic Poleward‐Moving Auroral Arcs at the Postdawn Sector: A Case Study

Multi‐Band Periodic Poleward‐Moving Auroral Arcs at the Postdawn Sector: A Case Study

Mesoscale Auroral Curls in Antarctica

Large-scale magnetic field oscillations and their effects on modulating energetic electron precipitation

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