Efficient Scattering Loss of Energetic Electrons by Enhanced Higher‐Band ECH Waves Observed by Van Allen Probes

Yang, Qiwu; Liu, Si; Yang, Hongming; Zhang, Sai; Tang, Jiawen; Xiao, Fuliang; Zhou, Qinghua; Gao, Zhonglei; Yang, He; Deng, Zhoukun; Li, Ping

doi:10.1029/2023gl103927

Cited by 4 publications

(3 citation statements)

References 54 publications

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“…They are usually observed as harmonic wave bands at frequencies between multiples of electron gyrofrequency (f ce ) [7][8][9]. Through cyclotron resonance, ECH waves are able to efficiently precipitate keV electrons from the magnetosphere to the ionosphere, contributing to the formation of diffuse aurora [10][11][12][13][14][15][16]. Therefore, a comprehensive understanding of the spatiotemporal distribution of ECH waves is required to forecast space weather [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Interplanetary shock induced intensification of electron cyclotron harmonic waves in the Earth’s inner magnetosphere

Xie,

Liu,

et al. 2024

Front. Phys.

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Electron cyclotron harmonic (ECH) waves are electrostatic emissions frequently observed in the Earth’s magnetosphere. By precipitating magnetospheric hot electrons into the ionosphere, ECH waves play a critical role in the formation of diffuse aurora. Previous research has extensively investigated the strong dependence of ECH waves on the geomagnetic activities. In this study, we present the first report of the prompt response of ECH waves to an interplanetary shock on the basis of WIND and Van Allen Probes observations. Our observations and analyses demonstrate that the interplanetary shock compression can increase >0.1 keV hot electron fluxes in the dayside inner magnetosphere, consequently leading to the prompt intensification of ECH waves by promoting the wave instability. These findings expand our comprehension of the impacts of solar wind disturbances on magnetospheric plasma waves and offer fresh insights into solar wind-magnetosphere-ionosphere coupling.

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Section: Introductionmentioning

confidence: 99%

Interplanetary shock induced intensification of electron cyclotron harmonic waves in the Earth’s inner magnetosphere

Xie,

Liu,

et al. 2024

Front. Phys.

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“…Within regions of L ≤ 8 R E in the inner magnetosphere, whistler‐mode chorus waves are the dominant mechanism for precipitation loss of electrons (Thorne et al., 2010), while beyond L = 8 R E , electron cyclotron harmonic waves are effective in producing the diffuse electron aurora (Ni et al., 2012; Zhang et al., 2015). Additionally, the efficiency of diffuse auroral scattering by ECH waves might be significant in the inner magnetosphere, particularly around L ∼ 6 R E (Fukizawa et al., 2022; Lou et al., 2021; Ni et al., 2011; Yang et al., 2023).…”

Section: Introductionmentioning

confidence: 99%

Global Distribution of EMIC Waves and Its Association to Subauroral Proton Precipitation During the 27 May 2017 Storm: Modeling and Multipoint Observations

Shreedevi,

Yu,

Miyoshi

et al. 2024

JGR Space Physics

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Recent simulation studies using the RAM‐SCB model showed that proton precipitation contributes significantly to the total energy flux deposited into the subauroral ionosphere thereby affecting the magnetosphere‐ionosphere coupling. In this study, we use the BATS‐R‐US + RAM‐SCB model to understand the evolution of ElectroMagnetic Ion Cyclotron (EMIC) waves in the inner magnetosphere, their correspondence to the proton precipitation into the subauroral ionosphere, and to assess the performance of the model in reproducing the EMIC wave‐particle interactions. During the 27 May 2017 storm, Arase and RBSP‐A satellites observed typical signatures of EMIC waves in the inner magnetosphere. Within this interval, Defense Meteorological Satellite Program (DMSP) and National Oceanic and Atmospheric Administration (NOAA)/MetOp satellites observed significant proton precipitation in the dusk‐midnight sector. Simulation results show that H‐ and He‐band EMIC waves are excited within regions of strong temperature anisotropy near the plasmapause. The simulated growth rates of EMIC waves show a similar trend to that of the EMIC wave power observed by the Arase and RBSP‐A satellites, suggesting that the model can reproduce the EMIC wave activity qualitatively. The simulated H‐band waves in the dusk sector are stronger than He‐band waves possibly due to the presence of excess protons in the boundary conditions obtained from the BATS‐R‐US code. The precipitating proton fluxes reproduced by the simulation with EMIC waves are found to agree reasonably well with the DMSP and NOAA/MetOp satellite observations. It is suggested that EMIC wave scattering of ring current ions can account for proton precipitation observed by the DMSP and MetOp satellites during the 27 May 2017 storm.

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“…Whistler mode wave, which earned its name for the characteristic whistling sound when played through an audio device, is a right‐handed polarized electromagnetic emission with the frequency between lower hybrid frequency ( f lh ) and electron cyclotron frequency ( f ce ) in the terrestrial magnetosphere (Xiao et al., 2015). Whistler mode wave is thought to play an essential role in regulating the magnetospheric electron flux (Jin et al., 2018), analogous to other important plasma waves, such as auroral kilometric radiation (AKR) (S. Zhang et al., 2020), electron cyclotron harmonic (ECH) wave (Q. Yang et al., 2023; Z. Gao et al., 2023), electromagnetic ion cyclotron (EMIC) wave (C. Yang et al., 2022; Guan et al., 2020), and magnetosonic (MS) wave (S. Liu et al., 2023).…”

Section: Introductionmentioning

confidence: 99%

Observational Evidence of the Four‐Wave Interaction Between Magnetospheric Whistler Mode Waves

Yang,

Liu,

Yang

et al. 2023

JGR Space Physics

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Whistler mode wave is a crucial emission which can significantly affect the electron dynamics in the magnetosphere. The nonlinear three‐wave interaction between whistler mode waves has been frequently observed, while the four‐wave interaction between these waves is seldom reported. Here, we present two multiband whistler mode wave events by Van Allen Probes, in which the relatively weak wave bands occur exactly corresponding to the strong wave bands. We find that the frequencies of the weak and strong bands satisfy the frequency matching conditions of the four‐wave interaction, and the wave normal angles of the weak bands are almost within the possible ranges calculated from the wave vector matching conditions. Additionally, the cross‐correlation coefficients between the amplitudes of the weak bands and that of strong bands approach 0.80. These results indicate that the weak bands are very likely to be produced by the four‐wave interaction between whistler mode waves. Similar to the three‐wave interaction, the four‐wave interaction can extend the frequency of whistler mode waves from close to 0.5fce to a wider range in both the lower (0.26fce) and upper (0.78fce) bands, and thus potentially play an important role in the electron dynamics.

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Efficient Scattering Loss of Energetic Electrons by Enhanced Higher‐Band ECH Waves Observed by Van Allen Probes

Cited by 4 publications

References 54 publications

Interplanetary shock induced intensification of electron cyclotron harmonic waves in the Earth’s inner magnetosphere

Interplanetary shock induced intensification of electron cyclotron harmonic waves in the Earth’s inner magnetosphere

Global Distribution of EMIC Waves and Its Association to Subauroral Proton Precipitation During the 27 May 2017 Storm: Modeling and Multipoint Observations

Observational Evidence of the Four‐Wave Interaction Between Magnetospheric Whistler Mode Waves

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