Observations and parametric study on the role of plasma density on extremely low-frequency chorus wave generation

He, Qian; Liu, Si; Xiao, F.; Gao, Zhonglei; Li, Tong; Shang, Xiongjun; Zhou, Qinghua; Yang, Chang; Yang, He

doi:10.1007/s11431-021-2030-7

Cited by 6 publications

(5 citation statements)

References 55 publications

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“…He et al., 2021; Q. He et al., 2022; Jin et al., 2018; Guo et al., 2020; Guan et al., 2020; Q. Yang et al., 2016; C. Yang et al., 2022). Several works have demonstrated that AKR may accelerate or scatter the energetic electrons under the proper conditions (Li et al., 2023; Summers et al., 2001; Xiao, Chen, & He, 2010; Xiao, Chen, He, & Yang, 2010; Xiao, Su, et al., 2010; Xiao et al., 2006; Zhang et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Direct Observation of L‐X Mode of Auroral Kilometric Radiation in the Lower Latitude Magnetosphere by the Arase Satellite

Zhang,

Yin,

Yang

et al. 2024

Geophysical Research Letters

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Previous studies have shown that auroral kilometric radiation (AKR) can play an important role in the magnetosphere‐atmosphere coupling and has the right‐handed extraordinary (R‐X), left‐handed ordinary (L‐O) and left‐handed extraordinary (L‐X) modes. However, the L‐X mode has not been directly observed in the lower latitude magnetosphere yet, probably because of its very limited frequency range. Here, using observations of the Arase satellite on 6 September 2018, we present an AKR event with two distinct bands (8–20 and 300–1000 kHz) around the location: L = 8 and latitude = −37°. The low (high) band is identified as the L‐X (R‐X) mode based on the polarization and frequency ranges. Simulations of 3‐D ray tracing show that most of ray paths with 14 (11 and 18) kHz pass (miss) the location of Arase, basically consistent with observations. Our study provides direct evidence that the L‐X mode can propagate from high latitudes downward to lower latitudes.

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Section: Introductionmentioning

confidence: 99%

Direct Observation of L‐X Mode of Auroral Kilometric Radiation in the Lower Latitude Magnetosphere by the Arase Satellite

Zhang,

Yin,

Yang

et al. 2024

Geophysical Research Letters

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“…Kurth et al (2015) have shown the presence of AKR in the equatorial region of radiation belts via observations from Van Allen Probes. Wave-particle interaction is an important process in the magnetosphere and has been studied widely (Jin et al 2018;Guan et al 2020;Guo et al 2020;He et al 2021He et al , 2022Yang et al 2022). Various simulations have investigated the interaction between AKR and radiation belt electrons and revealed that AKR can play an important role in the coupling of the ionosphere and the magnetosphere (Summers et al 2001;Xiao et al 2006Xiao et al , 2010Xiao et al , 2011Zhang et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Annual and Seasonal Occurrence Pattern of Auroral Kilometric Radiation Associated with the Interplanetary Magnetic Field*

Li,

Zhang,

Xiao

et al. 2024

ApJL

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Auroral kilometric radiation (AKR) is a widely existing strong radio emission from the Earth’s magnetosphere and is generated by suprathermal (1–10 keV) electrons in the polar cavity. Previous works have demonstrated that AKR can contribute to the coupling of the magnetosphere–ionosphere–atmosphere, but its relation to the interplanetary magnetic field (IMF) has not been studied so far. Here, we examine the data of Van Allen Probes and identify a total of 5000 AKR events from 2012 October to 2019 July. Most AKR events (4282) correspond to the dominant parallel component B ∥ ( = ( B x ) 2 + ( B y ) 2 ) of IMF. There are the most (1391) events in 2018 (the solar minimum year) and the least (258) events in 2014 (the solar maximum year), corresponding to more (less) occurrences for the longer duration (> 30 minutes) of southward IMF (B z < 0) in 2018 (2014). In the Earth’s Northern Hemisphere, there are the most (865) events in the autumn (August–October), corresponding to dominant B x < 0. In the Earth’s Southern Hemisphere, there are the most (830) events in the autumn (February–April), corresponding to dominant B x > 0. The probable reason for the above results is that the longer duration of B z < 0 can yield the longer magnetic reconnection, and the dominant B x < 0 (B x > 0) is favorable for the single-lobe magnetic reconnection in the northern (southern) hemisphere, allowing more suprathermal electrons into the polar source cavity and generating more AKRs. These current results suggest that IMF is very important for the occurrence of AKR and can be widely applied to similar auroral radio emissions in other magnetized planets of the solar system.

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“…Whistler mode waves are commonly observed in the magnetosphere of magnetized planets (Shprits et al, 2012), such as Jupiter (Scarf et al, 1979;Shprits et al, 2018;Li W et al, 2021), Saturn (Akalin et al, 2006;Hospodarsky et al, 2008;Kumari and Pandey, 2018), and Earth (Fairfield 1974;Wei XH et al, 2007;Yang QW et al, 2016;Shang XJ et al, 2021;He Q et al, 2022). In particular, whistler mode waves in the terrestrial magnetosphere have been extensively studied due to their critical roles in the acceleration of relativistic electrons (Xiao FL et al, 2014;Gao ZL et al, 2016), penetration of energetic electrons (Li W et al, 2009(Li W et al, , 2013Zhao H and Li X, 2013;Ni BB et al, 2018;Zhao YW et al, 2022), and scattering of relativistic electrons (Liu S et al, 2020;He JB et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Direct evidence for efficient scattering of suprathermal electrons by whistler mode waves in the Martian magnetosphere

Li,

Liu,

Yang

et al. 2023

Earth and Planetary Physics

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Observations and parametric study on the role of plasma density on extremely low-frequency chorus wave generation

Cited by 6 publications

References 55 publications

Direct Observation of L‐X Mode of Auroral Kilometric Radiation in the Lower Latitude Magnetosphere by the Arase Satellite

Direct Observation of L‐X Mode of Auroral Kilometric Radiation in the Lower Latitude Magnetosphere by the Arase Satellite

Annual and Seasonal Occurrence Pattern of Auroral Kilometric Radiation Associated with the Interplanetary Magnetic Field*

Direct evidence for efficient scattering of suprathermal electrons by whistler mode waves in the Martian magnetosphere

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