Abstract
Abstract Wave-particle interactions in a collisionless plasma have been analyzed in several past space science missions but direct and quantitative measurement of the interactions has not been conducted. We here introduce the Wave-Particle Interaction Analyzer (WPIA) to observe wave-particle interactions directly by calculating the inner product between the electric field of plasma waves and of plasma particles. The WPIA has four fundamental functions: waveform calibration, coordinate transformation, time correction, and interaction calculation. We demonstrate the feasibility of One-chip WPIA (O-WPIA) using a Field Programmable Gate Array (FPGA) as a test model for future science missions. The O-WPIA is capable of real-time processing with low power consumption. We validate the performance of the O-WPIA including determination of errors in the calibration and power consumption.
Highlights
Since space plasmas are essentially collisionless, their kinetic energies are altered mainly through wave-particle interactions
Wave-Particle Interaction Analyzer (WPIA) 3.1 Interconnections with necessary sensors In Section 2, we described the principle of the WaveParticle Interaction Analyzer (WPIA) and stressed its advantage in studying wave-particle interactions via spacecraft observations
Performance we demonstrate that the one-chip WPIA
Summary
Since space plasmas are essentially collisionless, their kinetic energies are altered mainly through wave-particle interactions. This means that plasma wave receivers and particle instruments should transmit the observed waveform data and the timing of the particle detection pulses with their energy information Additional information such as the incoming directions of the detected particles are sent to the WPIA. Duration, the phase of the observed waves in the frequency range from several hundreds of Hz to several kHz rotates much faster than the spacecraft spin velocity This means the O-WPIA can accumulate a lot of data on the phase relation of Ew · v even if the phase resolution of the particle detector is coarse. L is fixed at 1024, which is equivalent to a frequency resolution of 61 Hz. Since the load of the FFT calculations is the heaviest in the one-chip WPIA system, an estimation of the processing time of the FFT including the coordinate transformation is important. The particle data must wait for the end of the “Wave Calibration” and “Coordinate Transformation” processes as shown in Incoming
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