A Simulation Study of the Plasma Wave Enhancements in the Earth’s Equatorial Plasmasphere

Kalaee, Mohammad Javad; Katoh, Yutai; Ono, Takayuki

doi:10.1007/s11038-013-9414-6

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…Since KC is observed as L-O mode waves in most cases, KC is considered to be generated by the linear mode conversion processes in plasma density gradients around the plasmapause. On the other hand, Kalaee and Katoh (2016) reported that R-X mode KC are also observed by the Akebono satellite, suggesting that R-X mode waves can be generated by nonlinear interactions between Z-mode waves and energetic electrons based on simulations. Further discussion will be enabled by HFA EE-LR mode data and energetic electron data around the plasmapause obtained by Arase/LEP-e (Kazama et al 2017) and MEP-e (Kasahara et al 2018a).…”

Section: Radio and Plasma Waves During Geomagnetically Quiet And Distmentioning

confidence: 99%

High Frequency Analyzer (HFA) of Plasma Wave Experiment (PWE) onboard the Arase spacecraft

Kumamoto

Tsuchiya

Kasahara

et al. 2018

Earth Planets Space

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The High Frequency Analyzer (HFA) is a subsystem of the Plasma Wave Experiment onboard the Arase (ERG) spacecraft. The main purposes of the HFA include (1) determining the electron number density around the spacecraft from observations of upper hybrid resonance (UHR) waves, (2) measuring the electromagnetic field component of whistler-mode chorus in a frequency range above 20 kHz, and (3) observing radio and plasma waves excited in the storm-time magnetosphere. Two components of AC electric fields detected by Wire Probe Antenna and one component of AC magnetic fields detected by Magnetic Search Coils are fed to the HFA. By applying analog and digital signal processing in the HFA, the spectrograms of two electric fields (EE mode) or one electric field and one magnetic field (EB mode) in a frequency range from 10 kHz to 10 MHz are obtained at an interval of 8 s. For the observation of plasmapause, the HFA can also be operated in PP (plasmapause) mode, in which spectrograms of one electric field component below 1 MHz are obtained at an interval of 1 s. In the initial HFA operations from January to July, 2017, the following results are obtained: (1) UHR waves, auroral kilometric radiation (AKR), whistler-mode chorus, electrostatic electron cyclotron harmonic waves, and nonthermal terrestrial continuum radiation were observed by the HFA in geomagnetically quiet and disturbed conditions. (2) In the test operations of the polarization observations on June 10, 2017, the fundamental R-X and L-O mode AKR and the second-harmonic R-X mode AKR from different sources in the northern polar region were observed. (3) The semiautomatic UHR frequency identification by the computer and a human operator was applied to the HFA spectrograms. In the identification by the computer, we used an algorithm for narrowing down the candidates of UHR frequency by checking intensity and bandwidth. Then, the identified UHR frequency by the computer was checked and corrected if needed by the human operator. Electron number density derived from the determined UHR frequency will be useful for the investigation of the storm-time evolution of the plasmasphere and topside ionosphere.

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Section: Radio and Plasma Waves During Geomagnetically Quiet And Distmentioning

confidence: 99%

High Frequency Analyzer (HFA) of Plasma Wave Experiment (PWE) onboard the Arase spacecraft

Kumamoto

Tsuchiya

Kasahara

et al. 2018

Earth Planets Space

Self Cite

115

125

View full text Add to dashboard Cite

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Hybrid simulation of whistler excitation by electron beams in two-dimensional non-periodic domains

Woodroffe

Streltsov

2014

Journal of Computational Physics

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Particle simulation of electromagnetic emissions from electrostatic instability driven by an electron ring beam on the density gradient

2018

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This paper presents the wave mode conversion between electrostatic and electromagnetic waves on the plasma density gradient. We use 2-D electromagnetic code KEMPO2 implemented with the generation of density gradient to simulate such a conversion process. In the dense region, we use ring beam instability to generate electron Bernstein waves and we study the temporal evolution of wave spectra, velocity distributions, Poynting flux, and electric and magnetic energies to observe the wave mode conversion. Such a conversion process can be a source of electromagnetic emissions which are routinely measured by spacecraft on the plasmapause density gradient.

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A Simulation Study of the Plasma Wave Enhancements in the Earth’s Equatorial Plasmasphere

Cited by 3 publications

References 19 publications

High Frequency Analyzer (HFA) of Plasma Wave Experiment (PWE) onboard the Arase spacecraft

High Frequency Analyzer (HFA) of Plasma Wave Experiment (PWE) onboard the Arase spacecraft

Hybrid simulation of whistler excitation by electron beams in two-dimensional non-periodic domains

Particle simulation of electromagnetic emissions from electrostatic instability driven by an electron ring beam on the density gradient

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