Significance of Wave-Particle Interaction Analyzer for direct measurements of nonlinear wave-particle interactions

Katoh, Yutai; Kitahara, M.; Kojima, Hirotsugu; Omura, Yoshiharu; Kasahara, Satoshi; Hirahara, Masafumi; Miyoshi, Yoshizumi; Seki, K.; Asamura, Kazushi; Takashima, Takeshi; Ono, Takayuki

doi:10.5194/angeo-31-503-2013

Cited by 32 publications

(52 citation statements)

References 38 publications

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“…The fundamental concept of the WPIA is described by Fukuhara et al (2009) and Katoh et al (2013). The WPIA requires instantaneous-wave field vectors and velocity vectors of incoming plasma particles.…”

Section: Principle Of Wave-particle Interaction Analyzermentioning

confidence: 99%

“…This improves the signal-to-noise ratio of the S-WPIA because the frequency variation changes the energy and pitch angle ranges of electrons, satisfying the cyclotron resonance condition. Katoh et al (2013) demonstrated the validity of the calculation method in the WPIA by conducting pseudocalculations of the WPIA using the data obtained by the particle simulations that represent the resonance between whistler-mode chorus waves and energetic electrons. The simulation was a one-dimensional (1D) electron-hybrid code with a dipole magnetic field near the magnetic equator.…”

Section: Computation Of Wmentioning

confidence: 99%

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Data processing in Software-type Wave–Particle Interaction Analyzer onboard the Arase satellite

Hikishima

Kojima

Katoh

et al. 2018

Earth Planets Space

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The software-type wave-particle interaction analyzer (S-WPIA) is an instrument package onboard the Arase satellite, which studies the magnetosphere. The S-WPIA represents a new method for directly observing wave-particle interactions onboard a spacecraft in a space plasma environment. The main objective of the S-WPIA is to quantitatively detect wave-particle interactions associated with whistler-mode chorus emissions and electrons over a wide energy range (from several keV to several MeV). The quantity of energy exchanges between waves and particles can be represented as the inner product of the wave electric-field vector and the particle velocity vector. The S-WPIA requires accurate measurement of the phase difference between wave and particle gyration. The leading edge of the S-WPIA system allows us to collect comprehensive information, including the detection time, energy, and incoming direction of individual particles and instantaneous-wave electric and magnetic fields, at a high sampling rate. All the collected particle and waveform data are stored in the onboard large-volume data storage. The S-WPIA executes calculations asynchronously using the collected electric and magnetic wave data, data acquired from multiple particle instruments, and ambient magnetic-field data. The S-WPIA has the role of handling large amounts of raw data that are dedicated to calculations of the S-WPIA. Then, the results are transferred to the ground station. This paper describes the design of the S-WPIA and its calculations in detail, as implemented onboard Arase.

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Section: Principle Of Wave-particle Interaction Analyzermentioning

confidence: 99%

Section: Computation Of Wmentioning

confidence: 99%

Data processing in Software-type Wave–Particle Interaction Analyzer onboard the Arase satellite

Hikishima

Kojima

Katoh

et al. 2018

Earth Planets Space

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“…The WPIA measurement in the simulation is described in Katoh et al (2013), and we conduct the WPIA measurement in the same processing. The full-particle simulation code is used for the generation of whistler-mode chorus waves (Hikishima et al 2009a(Hikishima et al , 2009b(Hikishima et al , 2010).…”

Section: Pseudo-measurement Of Wpia In Simulationmentioning

confidence: 99%

Evaluation of waveform data processing in Wave-Particle Interaction Analyzer

2014

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The Wave-Particle Interaction Analyzer (WPIA) is a software function installed on the Exploration of energization and Radiation in Geospace (ERG) satellite. The WPIA directly measures the quantity of energy transfer between whistler-mode chorus waves and resonant energetic electrons by using plasma wave vectors and velocity vectors of plasma particles. The phase differences of the WPIA require accurate phase angles of waves and electrons in order to statistically evaluate the significance of the quantity of energy transfer. We propose a technical method for efficient waveform processing in order to conduct the WPIA measurement precisely. In the WPIA measurement, the various waves detected by the onboard instrument appear as noise in the calculation of the quantity of energy transfer for whistler-mode chorus waves. The characteristic frequency variation of the chorus waves makes waveform processing difficult. A chorus waveform is used for the WPIA processing through passband filtering by selecting appropriate data processing length and frequency resolution. We implement overlapping processing of wave data in order to reduce the induced error of the wave phase. The results of waveform processing indicate that the phase errors are successfully reduced and statistical fluctuations are suppressed. The proposed waveform processing method is a necessary and applicative processing for the calculations of the WPIA in the ERG mission.

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“…By the WPIA, we can thereby identify the efficiency of the energy exchange through wave-particle interactions by selecting the range of the kinetic energy and pitch angle of electrons used in the computation of W int . The statistical significance of the obtained W int is evaluated by the standard deviation s W [3].…”

Section: Feasibility Of Swpiamentioning

confidence: 99%

“…So as to overcome the difficulty of the direct measurement of wave-particle interactions, we have proposed a new instrumentation "Wave-Particle Interaction Analyzer (WPIA)" [1][2][3]. Figure 1 represents the procedure of the Software-type WPIA (SWPIA) to be installed in the upcoming JAXA satellite mission ERG (Exploration of energization and Radiation in Geospace) as a software function running on the onboard CPU of the satellite.…”

Section: Introductionmentioning

confidence: 99%

Direct Measurement of Nonlinear Wave-Particle Interactions in the Earth's Magnetosphere: Wave-Particle Interaction Analyzer (WPIA) for ERG Mission

Katoh

Hikishima²,

Kojima³

et al. 2014

Proceedings of the 12th Asia Pacific Physics Conference (APPC12)

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Wave Particle Interaction Analyzer (WPIA) is onboard software to be installed in the upcoming JAXA/ERG satellite. The significance of the WPIA is studied for measurement of the energy transfer process directly between energetic electrons and whistler-mode chorus emissions in the Earth's inner magnetosphere. The WPIA measures a relative phase angle between the wave electromagnetic field vector (E or B) and velocity vector (v) of each electron and computes physical quantities such as an inner product W, where W is the inner product between v and E and is the time variation of the kinetic energy of energetic electrons interacting with plasma waves. This paper presents the feasibility of the WPIA, which is evaluated by applying the analysis to simulation results of whistler-mode chorus generation.

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Significance of Wave-Particle Interaction Analyzer for direct measurements of nonlinear wave-particle interactions

Cited by 32 publications

References 38 publications

Data processing in Software-type Wave–Particle Interaction Analyzer onboard the Arase satellite

Data processing in Software-type Wave–Particle Interaction Analyzer onboard the Arase satellite

Evaluation of waveform data processing in Wave-Particle Interaction Analyzer

Direct Measurement of Nonlinear Wave-Particle Interactions in the Earth's Magnetosphere: Wave-Particle Interaction Analyzer (WPIA) for ERG Mission

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