Relation Between Shock‐Related Impulse and Subsequent ULF Wave in the Earth's Magnetosphere

Zhang, Dianjun; Liu, Wenlong; Li, Xinlin; Sarris, T. E.; Wang, Yongfu; Chen, Xiao; Zhongliang, Zhao; Wygant, J. R.

doi:10.1029/2020gl090027

Cited by 15 publications

(16 citation statements)

References 59 publications

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“…Definitive identification of sources is challenging because intense geoelectric fields are sometimes associated with multiple sources simultaneously. For example, ULF waves can be driven by IP shocks and substorm activity (Oliveira et al., 2020; D. Zhang et al., 2020; James et al., 2013). The second geoelectric field peak in the E x component in Figure 8c is associated with ULF waves driven by the IP shock.…”

Section: Sources Of Intense Geoelectric Fieldsmentioning

confidence: 99%

Characteristics and Sources of Intense Geoelectric Fields in the United States: Comparative Analysis of Multiple Geomagnetic Storms

et al. 2022

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The coupling between the solar wind and the magnetosphere-ionosphere (M-I) system generates various phenomena in the near-Earth space environment including M-I currents that generate geomagnetic perturbations. The geomagnetic perturbations can in turn induce geoelectric fields within the electrically conducting Earth. In turn these geoelectric fields drive electric currents that can flow through technological infrastructure in the form of geomagnetically induced currents (GICs). Therefore, the geoelectric field is an important link between magnetospheric/ionospheric phenomena and GICs in grounded electrical transmission networks. Geoelectric fields enable calculation of GICs and both complement and provide validation against direct measurements of GICs, which have limited availability to the scientific community. Moreover, GIC levels depend on specific power

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Section: Sources Of Intense Geoelectric Fieldsmentioning

confidence: 99%

Characteristics and Sources of Intense Geoelectric Fields in the United States: Comparative Analysis of Multiple Geomagnetic Storms

et al. 2022

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“…ULF waves in low‐latitudes magnetosphere are believed to be generated by the fast compressional mode wave that couples with the shear Alfven wave field line resonances (e.g., Sciffer & Waters, 2011; Singer et al., 1981; Yumoto et al., 1985). A compressional mode can transfer energy to localized field line resonances where the frequency of the compressional mode matches the frequency of the local field line (e.g., Kivelson & Southwood, 1986; D. Zhang et al., 2020). Cavity mode model has been considered as a receivable generation mechanism for ULF waves (e.g., Keiling et al., 2001; Southwood & Kivelson, 1990; Sutcliffe et al., 2013; Takahashi et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

ULF Fluctuation of Low‐Latitude Ionospheric Electric Fields During Sudden Commencements

et al. 2022

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We use the C/NOFS satellite observations to provide the direct evidence for ultra‐low‐frequency (ULF) fluctuations in the low‐latitude ionospheric electric field during the sudden commencement (SC) on 8 March 2012. The meridional plasma drift shows a sudden downward motion with a large amplitude after SC onset. This initial westward electric field signature is followed by ULF fluctuations with periods of 28–100 s. Further, C/NOFS observations show that the ionospheric zonal electric field and compressional component of geomagnetic field present the similar ULF fluctuations with a ∼90° phase difference, indicating the existence of a standing compressional mode wave. The fluctuations in the ionospheric electric field and horizontal component of the geomagnetic field on the ground also exhibit a high correlation and the frequency of the ground‐based geomagnetic field shows no dependence with latitudes. These results suggest that the ULF waves in the ionospheric electric field may be associated with a cavity mode. We also show the ULF waves in ionospheric electric fields in other cases. The ULF wave electric fields provide important information on the ionospheric studies and ionosphere‐magnetosphere coupling in low latitudes.

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“…This suggests that the transverse waves detected satisfied field line resonance (FLR) condition. IP‐shock induced ULF waves are suggested to be excited through the FLR mechanism (e.g., Araki et al., 1997; Chi et al., 2001; Sarris et al., 2010; D. Zhang et al., 2020; X. Y. Zhang et al., 2010; Q.‐G. Zong et al., 2009).…”

Section: Data Analyses and Resultsmentioning

confidence: 99%

Van Allen Probe Observations of Disappearance, Recovery and Patchiness of Plasmaspheric Hiss Following Two Consecutive Interplanetary Shocks: First Results

et al. 2021

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Plasmaspheric hiss waves are mostly structureless, low frequency (100 Hz to few kHz) broadband whistler mode electromagnetic emissions confined inside the high-density plasmasphere and duskside plasmaspheric Abstract We present, for the first time, a plasmaspheric hiss event observed by the Van Allen probes in response to two successive interplanetary (IP) shocks occurring within an interval of ∼2 h on December 19, 2015. The first shock arrived at 16:16 UT and caused disappearance of hiss for ∼30 min. Combined effect of plasmapause crossing, significant Landau damping by suprathermal electrons and their gradual removal by magnetospheric compression led to the disappearance of hiss. Calculation of electron phase space density and linear wave growth rates showed that the shock did not change the growth rate of whistler waves within the core frequency range of plasmaspheric hiss (0.1-0.5 kHz) during this interval making conditions unfavorable for the generation of hiss. The recovery began at ∼16:45 UT which is attributed to an enhancement in local plasma instability initiated by the first shock-induced substorm and additional possible contribution from chorus waves. This time, the wave growth rate peaked within the core frequency range (∼350 Hz). The second shock arrived at 18:02 UT and generated patchy hiss persisting up to ∼19:00 UT. It is shown that an enhanced growth rate and additional contribution from shock-induced poloidal Pc5 mode (periodicity ∼240 s) ultralow frequency (ULF) waves resulted in the excitation of hiss waves during this period. The hiss wave amplitudes were found to be additionally modulated by background plasma density and fluctuating plasmapause location. The investigation highlights the important roles of IP shocks, substorms, ULF waves, and background plasma density in the variability of plasmaspheric hiss.Plain Language Summary Plasmaspheric hiss waves are whistler-mode, low frequency electromagnetic emissions found inside the dense plasmasphere and duskside plasmaspheric plumes. These waves play important role in controlling radiation belt dynamics by efficiently scattering electrons leading to their precipitation into the atmosphere. Therefore, understanding their variability is an important topic in radiation belt studies. Earlier studies on plasmaspheric hiss waves showed their intensification as well as disappearance following a single interplanetary (IP) shock impact. In this study, we provide the first direct observational evidence of plasmaspheric hiss variability in response to two consecutive IP shocks hitting the magnetosphere within an interval of ∼2 h based on unique observations by the twin Van Allen probes. Based on these observations and supported by detailed linear wave growth rate and phase space density analyses, it is shown that substorms triggered by both the IP shocks and ultralow frequency waves generated after the second shock modulated the plasmaspheric hiss wave intensities in a significant manner. The amplitudes of the hiss waves are also found to be modulated b...

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Relation Between Shock‐Related Impulse and Subsequent ULF Wave in the Earth's Magnetosphere

Cited by 15 publications

References 59 publications

Characteristics and Sources of Intense Geoelectric Fields in the United States: Comparative Analysis of Multiple Geomagnetic Storms

Characteristics and Sources of Intense Geoelectric Fields in the United States: Comparative Analysis of Multiple Geomagnetic Storms

ULF Fluctuation of Low‐Latitude Ionospheric Electric Fields During Sudden Commencements

Van Allen Probe Observations of Disappearance, Recovery and Patchiness of Plasmaspheric Hiss Following Two Consecutive Interplanetary Shocks: First Results

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