Plasma Wave Experiment (PWE)

Members

PI

  • Yoshiya Kasahara (Kanazawa University)

Co-PI

  • Yasumasa Kasaba (Tohoku University)
  • Hirotsugu Kojima (Kyoto University)
  • Satoshi Yagitani (Kanazawa University)

Co-I

  • Keigo Ishisaka (Toyama Prefectural University)
  • Atsushi Kumamoto (Tohoku University)
  • Fuminori Tsuchiya (Tohoku University)
  • Mitsunori Ozaki (Kanazawa University)
  • Tomohiko Imachi (Kanazawa University)
  • Yoshizumi Miyoshi (Nagoya University)
  • Shoya Matsuda (Nagoya University)
  • Satoshi Kurita (Nagoya University)
  • Tomoko Nakagawa (Tohoku Institute of Technology)
  • Mitsuru Hikishima (JAXA/ISAS)
  • Yuto Katoh (Tohoku University)
  • Hiroaki Misawa (Tohoku University)
  • Tomoki Kimura (Riken)

Instrument Specifications and Measured Quantities

Electric Field Sensor

Developed by NIPPI Corporation and Tohoku University.

  • WPT (Wire-Probe Antenna): 4 fifteen-m wire antennas
       Electric field DC to 10 MHz, 2 axes (EU, EV)

Magnetic Field Sensor

Developed by NIPPI Corporation and Kanazawa University.

  • MSC (Magnetic Search Coils)
       Magnetic field 1 Hz to 100 kHz, 3 axes (Bα, Bβ, Bγ)

Low-Frequency Wave Receiver: EWO (EFD/OFA/WFC)

Developed by MItsubishi Heavy Industries, and Kyoto University, Kanazawa University, Tohoku University, and Toyama Prefectural University.

  • EFD (Electric Field)
       DC to 200 Hz (electric field wave form and spectrum)
    • EFD-DPB (Double Probe)
         wave form (64 Hz (Apo[apogee]-mode) or 256 Hz(Peri[perigee]-mode)
         spectrum (f=1-224 Hz)
    • EFD-SPB (Single Probe)
         wave form (8 Hz)
    • EFD Burst
         EFD-DPB (512 Hz) and EFD-SPB (128 Hz) are continuously or intermittently measured.
  • OFA (Onboard Frequency Analyzer)
       10 Hz to 20 kHz (electric field spectrum)
       1 Hz to 20 kHz (magnetic field spectrum)
    • OFA-SPEC: power spectrum (selected from the following 4 modes)
         Δt=0.5 s (# of frequency: 66 pts)
         Δt=1 s (# of frequency: 132 pts)
         Δt=2 s (# of frequency: 264 pts)
         Δt=4 s (# of frequency: 528 pts)
    • OFA-MATRIX: spectral-matrix
         Interlocked with OFA-SPEC. The time resolution is reduced to 1/8.
         (Δt=4 s if Δt=0.5 s for OFA-SPEC. The same frequency resolution.)
    • OFA-COMPLEX: real and imaginary parts of instantaneous spectrum
         The same time and frequency resolutions as OFA-MATRIX.
  • WFC (Waveform Capture)
       10 Hz to 20 kHz (electric field wave form)
       1 Hz to 20 kHz (magnetic field wave form)
    • Chorus Burst: 65,536 Hz, 5 electric and magnetic field components, intermittently measured (8 s/shot (nominal))
    • EMIC Burst: 1,024 Hz, 5 electric and magnetic field components, intermittently measured (3 min/shot (nominal))

High-Frequency Wave Receiver: HFA

Developed by Meisei Electric and Tohoku University.

  • HFA (High Frequency Analyzer)
       10 kHz to 10 MHz (electric field spectrum, # of frequency: 480 pts, Δf/f<2.5%)
       10 kHz to 100 kHz (magnetic field spectrum, # of frequency: 160 pts, Δf/f<2.5%)
    • EE-mode (2 electric field components, Δt=8 s (nominal) or 1 s, 2 s, 16 s (optional))
    • EB-mode (1 electric field component + 1 magnetic field component, Δt=8 s (nominal) or 1 s (optional))
    • Plasmapause mode (1 electric field component, Δt=1 s (nominal))
       (optional modes)
    • wave form output mode (event-trigger method, 0.082 ms duration (25 Msps) and 0.82 ms duration (2.5 Msps))
    • high frequency resolution mode (Δf=1.2 kHz (<1 MHz) or Δf=12 kHz (>1 MHz))
         The band width, number of channels, and time resolution depend on setting.
       UHR frequency detection for plasma density measurement (Δt=1 s)

Other Information

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