Propagation of EMIC Waves Inside the Plasmasphere: A Two‐Event Study

Wang, G.; Zhang, T. L.; Gao, Zhonglei; Wu, Mingyu; Schmid, Daniel

doi:10.1029/2019ja027055

Cited by 6 publications

(8 citation statements)

References 112 publications

(185 reference statements)

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“…(2019) reported a

{He}^{+}

band wave event associated with density variation, wave mode analyze suggesting that the waves belong to the guided mode. EMIC waves with quasi‐constant frequency crossing a range of L‐shell have been reported previously (e.g., Paulson et al., 2014, 2017; Tetrick et al., 2017; G. Wang et al., 2019, and others). One explanation for the events in G. Wang et al.…”

Section: Introductionmentioning

confidence: 63%

“…10.1029/2021JA029322 2 of 18 (resampled to 32 Hz) to obtain the cross-power spectra, and thus, we obtain the Poynting vector (Santolík et al, 2010). The technical details are the same as G. Wang et al (2019).…”

Section: Extraction Of Wave Propertiesmentioning

confidence: 99%

“…Wang et al, 2019, and others). One explanation for the events in G. Wang et al (2019) is that the waves emitted from the sources may pass through the crossover frequency and bi-ion frequency, turning from the guided L-mode waves to the unguided R-mode waves (Hu et al, 2010;G. Wang et al, 2019).…”

mentioning

confidence: 99%

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Trapping and Amplification of Unguided Mode EMIC Waves in the Radiation Belt

Geng

Gao

et al. 2021

JGR Space Physics

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Electromagnetic ion cyclotron (EMIC) waves can cause the scattering loss of the relativistic electrons in the radiation belt. They can be classified into the guided mode and the unguided mode, according to wave's propagation behavior. The guided mode waves have been widely investigated in the radiation belt, but the observation of the unguided mode waves have not been expected. Based on the observations of Van Allen Probes, we demonstrate for the first time the existence of the intense unguided L‐mode EMIC waves in the radiation belt according to the polarization characteristics. Growth rate analyses indicate that the hot protons with energies of a few hundred keV may provide the free energy for wave growth. The reflection interface formed by the spatial locations of local helium cutoff frequencies can be nearly parallel to the equatorial plane when the proton abundance ratio decreases sharply with L‐shell. This structure combined with hot protons may lead to the trapping and significant amplification of the unguided mode waves. These results may help to understand the nature of EMIC waves and their dynamics in the radiation belt.

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“…(2019) reported a

{He}^{+}

Section: Introductionmentioning

confidence: 63%

Section: Extraction Of Wave Propertiesmentioning

confidence: 99%

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Trapping and Amplification of Unguided Mode EMIC Waves in the Radiation Belt

Geng

Gao

et al. 2021

JGR Space Physics

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“…s depends on the phase space density F and its deviation with respect to energy and pitch angle. The technique details follow Su et al (2018); Liu et al (2018a); Wang et al (2019).…”

Section: Methodsmentioning

confidence: 99%

Reflection of low-frequency fast magnetosonic waves at the local two-ion cutoff frequency: Observation in the plasmasphere

Wang¹,

Wu²,

Wang³

et al. 2021

Preprint

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Abstract. We investigate the reflection of low-harmonic fast magnetosonic (MS) waves at the local two-ion cutoff frequency (fcutHe+). By comparing the wave signals of the two Van Allen Probes, a distinct boundary where wave energies cannot penetrate inward are found in time-frequency domain. The boundary is identified as the time series of local fcutHe+. For a certain frequency, there exists a spatial interface formed by fcutHe+, where the incident waves should be reflected. The waves with small incident angles are more likely to penetrate the thin layer where the group velocity reduces significantly, and being trapped in a period of several to tens of seconds before the reflection process complete. The cutoff reflection scenario can explain the intense outward waves observed by Probe-A. These results of MS reflection at fcutHe+ may help to predict the global distribution of MS waves and promote the understanding of wave-particle dynamics in the radiation belt.

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“…s depends on the phase space density F and its deviation with respect to energy and pitch angle. The technique details follow Su et al (2018), Liu et al (2018a) and Wang et al (2019).…”

Section: Methodsmentioning

confidence: 99%

Reflection of low-frequency fast magnetosonic waves at the local two-ion cutoff frequency: observation in the plasmasphere

Wang

Xiao

et al. 2021

Ann. Geophys.

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Abstract. We investigate the reflection of low-harmonic fast magnetosonic (MS) waves at the local two-ion cutoff frequency (fcutHe+). By comparing the wave signals of the two Van Allen Probes satellites, a distinct boundary where wave energies cannot penetrate inward are found in the time–frequency domain. The boundary is identified as the time series of local fcutHe+. For a certain frequency, there exists a spatial interface formed by fcutHe+, where the incident waves should be reflected. The waves with small incident angles are more likely to penetrate the thin layer where the group velocity reduces significantly and then slow down in a period of several to tens of seconds before the reflection process complete. The cutoff reflection scenario can explain the intense outward waves observed by probe A. These results of MS reflection at fcutHe+ may help to predict the global distribution of MS waves and promote the understanding of wave–particle dynamics in the radiation belt.

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Propagation of EMIC Waves Inside the Plasmasphere: A Two‐Event Study

Cited by 6 publications

References 112 publications

Trapping and Amplification of Unguided Mode EMIC Waves in the Radiation Belt

Trapping and Amplification of Unguided Mode EMIC Waves in the Radiation Belt

Reflection of low-frequency fast magnetosonic waves at the local two-ion cutoff frequency: Observation in the plasmasphere

Reflection of low-frequency fast magnetosonic waves at the local two-ion cutoff frequency: observation in the plasmasphere

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