Evening Side EMIC Waves and Related Proton Precipitation Induced by a Substorm

Yahnin, A. G.; Попова, Т. А.; Демехов, А. Г.; Lubchich, A. A.; Matsuoka, A.; Asamura, Kazushi; Miyoshi, Yoshizumi; Yokota, Shoichiro; Kasahara, Satoshi; Keika, K.; Hori, Tomoaki; Tsuchiya, Fuminori; Kumamoto, Atsushi; Kasahara, Yoshiya; Motomizu, Shoji; Kasaba, Yasumasa; Nakamura, Satoko; Shinohara, I.; Kim, H.; Noh, S. J.; Raita, Tero

doi:10.1029/2020ja029091

Cited by 16 publications

(21 citation statements)

References 111 publications

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“…The above analysis focused on the IB location determined based on proton flux observations of only one energy channel (i.e., 39 keV). However, the scattering and subsequent precipitation due to FLCS are energy‐dependent (Yahnin et al., 2021; Yu et al., 2020; Yue et al., 2014; Zhang et al., 2010). Therefore, we further utilize the higher energy channel data (i.e., 115 keV) on POES satellites to conduct the same analysis and yield empirical formulas for the IB location at different energies.…”

Section: Resultsmentioning

confidence: 99%

An Empirical Model of the Proton Isotropic Boundary (IB)

Tian

et al. 2022

JGR Space Physics

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Low-Earth-Orbit (LEO) satellite missions, such as DMSP and NOAA/Polar Operational Environmental Satellites (POES) that monitor the low-altitude regions often detect a zone where the precipitating proton flux is large and even comparable to the trapped flux. These precipitating protons are believed to be scattered from the central plasma sheet, due to either resonant interactions between particles and electromagnetic ion cyclotron (EMIC) waves (

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Section: Resultsmentioning

confidence: 99%

An Empirical Model of the Proton Isotropic Boundary (IB)

Tian

et al. 2022

JGR Space Physics

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“…Yahnin et al. (2021) examined a non‐storm EMIC event but it was related to a substorm event, thus, not strictly quiet time event. They showed that the proton flux enhancement coincided with EMIC wave enhancement or appearance.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Ionospheric Compressional Waves and Electron Density Oscillation During Storm Periods Using Swarm Observations

Wang

Lühr

2022

JGR Space Physics

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Using Swarm satellite observations, we aimed to examine compressional electromagnetic ion cyclotron (EMIC) waves and concurrent plasma density oscillations during storm periods (2014–2018). Compressional waves were accompanied by precipitated energetic proton fluxes, which can lead to increased electron density in the F‐layer. Approximately one‐third of compressional waves were accompanied by electron density (Ne) oscillations. The Ne oscillation occurred more frequently during stronger magnetic storms and with EMIC wave events of larger power density. The morning sector and South Atlantic Anomaly region revealed high occurrence rates of Ne oscillations. Its peak occurrence region showed a local time drift during the storm evolution. These variations with magnetic local time and storm phases are consistent with those of EMIC waves. Phases of the EMIC compressional waves and Ne oscillations exhibited a strong correlation. The phases of EMIC waves and Ne oscillations were linearly related, apart from a bias of ∼17.5° or 200.5°. The relative amplitude ratio of most Ne oscillations to the compressional EMIC wave showed a strong correlation with the local Alfven velocity. When the Alfven velocity increased, the relative amplitude ratio also increased, and there appeared a saturation of the relative amplitude ratio at large Alfven velocity.

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“…The wave growth rates and cut-off frequencies of each sub-band are determined by the hot ion temperature anisotropy, ion composition, and cold plasma density (Kozyra et al, 1984). As the EMIC wave instability evolves, the initially unstable proton distribution isotropizes due to pitch-angle scattering and loss of protons into the atmosphere (e.g., Usanova et al, 2010;Søraas et al, 2013;Yahnin et al, 2021). This process is incorporated in global ring current models (Jordanova et al, 2012) which showed its contribution to a gradual recovery of magnetic storms.…”

Section: How Do Ulf Waves Couple To the Ring Current?mentioning

confidence: 99%

ULF Wave Modeling, Effects, and Applications: Accomplishments, Recent Advances, and Future

Hartinger

Takahashi

Drozdov

et al. 2022

Front. Astron. Space Sci.

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Ultra Low Frequency (ULF) waves play important roles in magnetosphere-ionosphere coupling, ring current and radiation belt dynamics, and modulation of higher frequency wave modes and energetic particle precipitation. The “ULF wave modeling, effects, and applications” (UMEA) focus group - part of the Geospace Environment Modeling effort from 2016 to 2021 - sought to improve understanding of the physics of ULF waves and their specification in geospace models. Through a series of in person and virtual meetings the UMEA focus group brought modelers and experimentalists together to compare ULF wave outputs in different models, plan observation campaigns focused on ULF waves, discuss recent advances in ULF wave research, and identify unresolved ULF wave science questions. This article summarizes major discussion points and accomplishments in the UMEA focus group over the last 6 years, recent advances and their connection to Richard Thorne and Peter Gary’s significant contributions to ULF wave research, and the future of ULF wave research.

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Evening Side EMIC Waves and Related Proton Precipitation Induced by a Substorm

Cited by 16 publications

References 111 publications

An Empirical Model of the Proton Isotropic Boundary (IB)

An Empirical Model of the Proton Isotropic Boundary (IB)

Analysis of Ionospheric Compressional Waves and Electron Density Oscillation During Storm Periods Using Swarm Observations

ULF Wave Modeling, Effects, and Applications: Accomplishments, Recent Advances, and Future

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