Modulation of ionospheric outflow ions by EMIC waves in the dayside outer magnetosphere

Shi, Chen; Zhao, Jinsong; Huang, Chaoyan; Wang, Tieyan; Dunlop, Malcolm

doi:10.1063/1.5142686

Cited by 6 publications

(7 citation statements)

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“…In this event, MMS was located in the outer duskside magnetosphere (GSE [6.2, 7.8, 1.0] Earth radius, L-shell = 10.3 and magnetic local time = 15.1 h), and approximately south of the magnetic equator. This event has been reported previously for studying cold (<100 eV) H + ion motion in EMIC waves 16 . Here, we investigate how cross-scale wave–particle interactions control energy flow in this event.…”

Section: Resultssupporting

confidence: 67%

“…Here, the cold ions are dominated by H + ions, which have a gyro-frequency (0.7 Hz) three times larger than the EMIC wave (0.22 Hz). Therefore, as for ULF waves, the motion of cold H + ions in the EMIC wave fields can be approximated by their drift 16 , as supported by the observations of ion bulk velocity that are nearly equal to the calculated drift velocity (Supplementary Fig. 5d ).…”

Section: Resultssupporting

confidence: 63%

“…3c ). A singular value decomposition analysis reveals that the 0.22 Hz waves are left-hand circularly polarized and propagating anti-parallel to the background magnetic field 16 . Hence, the 0.22 Hz waves fit the classification reserved for EMIC waves.…”

Section: Resultsmentioning

confidence: 99%

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Simultaneous macroscale and microscale wave–ion interaction in near-earth space plasmas

et al. 2022

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Identifying how energy transfer proceeds from macroscales down to microscales in collisionless plasmas is at the forefront of astrophysics and space physics. It provides information on the evolution of involved plasma systems and the generation of high-energy particles in the universe. Here we report two cross-scale energy-transfer events observed by NASA’s Magnetospheric Multiscale spacecraft in Earth’s magnetosphere. In these events, hot ions simultaneously undergo interactions with macroscale (~$${10}^{5}$$ 10 5 km) ultra-low-frequency waves and microscale ($$\sim {10}^{3}$$ ~ 10 3 km) electromagnetic-ion-cyclotron (EMIC) waves. The cross-scale interactions cause energy to directly transfer from macroscales to microscales, and finally dissipate at microscales via EMIC-wave-induced ion energization. The direct measurements of the energy transfer rate in the second event confirm the efficiency of this cross-scale transfer process, whose timescale is estimated to be roughly ten EMIC-wave periods about (1 min). Therefore, these observations experimentally demonstrate that simultaneous macroscale and microscale wave-ion interactions provide an efficient mechanism for cross-scale energy transfer and plasma energization in astrophysical and space plasmas.

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Section: Resultssupporting

confidence: 67%

Section: Resultssupporting

confidence: 63%

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Simultaneous macroscale and microscale wave–ion interaction in near-earth space plasmas

et al. 2022

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“…The magnetospheric multiscale (MMS) mission (Burch et al., 2015) provides unprecedented high‐resolution measurements in the near‐Earth plasma environment which have enabled studying the kinetic interaction of cold and hot protons in detail, and have recently shown the cold proton ability to remain magnetized inside spatial structures larger than their gyroradius (Alm et al., 2019; André et al., 2016; Shi et al., 2020; Toledo‐Redondo et al, 2016, 2018).…”

Section: Introductionmentioning

confidence: 99%

Kinetic Interaction of Cold and Hot Protons With an Oblique EMIC Wave Near the Dayside Reconnecting Magnetopause

Toledo‐Redondo

Lee

Vines

et al. 2021

Geophysical Research Letters

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“…The magnetospheric multiscale (MMS) mission (Burch et al, 2015) provides unprecedented high-resolution measurements in the near-Earth plasma environment which have enabled studying the kinetic interaction of cold and hot protons in detail, and have recently shown the cold proton ability to remain magnetized inside spatial structures larger than their gyroradius (Alm et al, 2019;André et al, 2016;Shi et al, 2020;Toledo-Redondo et al, 2016, 2018.…”

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confidence: 99%

Kinetic interaction of cold and hot protons with an oblique EMIC wave near the dayside reconnecting magnetopause

Toledo‐Redondo

Lee

Vines

et al. 2021

Preprint

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<p>We report observations of the ion dynamics inside an Alfven branch wave that propagates near the reconnecting dayside magnetopause. The measured frequency, wave normal angle and polarization are within 1% with the predictions of a dispersion solver, and indicate that the wave is an electromagnetic ion cyclotron wave with very oblique wave vector. The magnetospheric plasma contains hot protons (keV), cold protons (eV), plus some heavy ions. The cold protons follow the magnetic field fluctuations and remain frozen-in, while the hot protons are at the limit of magnetization.</p><p>The cold proton velocity fluctuations contribute to balance the Hall term in Ohm's law, allowing the wave polarization to be highly-elliptical and right-handed, a necessary condition for propagation at oblique wave normal angles. The dispersion solver indicates that increasing the cold proton density facilitates generation and propagation of these waves at oblique angles, as it occurs for the observed wave.</p>

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Modulation of ionospheric outflow ions by EMIC waves in the dayside outer magnetosphere

Abstract: This is a copy of the published version, or version of record, available on the publisher's website. This version does not track changes, errata, or withdrawals on the publisher's site.

Cited by 6 publications

References 44 publications

Simultaneous macroscale and microscale wave–ion interaction in near-earth space plasmas

Simultaneous macroscale and microscale wave–ion interaction in near-earth space plasmas

Kinetic Interaction of Cold and Hot Protons With an Oblique EMIC Wave Near the Dayside Reconnecting Magnetopause

Kinetic interaction of cold and hot protons with an oblique EMIC wave near the dayside reconnecting magnetopause

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