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Instrument: PWI : Plasma Waves Investigation (Geotail)
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The objective of this investigation is to determine the dynamic behavior of the
plasma trapped in the earth's magnetosphere (i.e. toroidal and poloidal
currents, oscillations and waves in the plasmas, ion entrance and exit via the
ionosphere and solar wind, and the extent of the plasma sheath).

The instrument measures electric fields over the range 0.5 Hz to 400 kHz, and
magnetic fields over the range 1 Hz to 10 kHz. Triaxial magnetic search coils
are utilized in addition to a pair of electric dipole antennas. The instrument
contains two sweep-frequency receivers (12 Hz to 400 kHz and 12 Hz to 6.25
kHz), a multichannel analyzer (5.6 Hz to 311 kHz for the electric antenna and
5.6 Hz to 1.0 kHz for the magnetic coils), a low frequency waveform receiver
(0.01 to 10 Hz), and a wideband waveform receiver (10 Hz to 16 kHz).

Principal Investigator:
Prof. Hiroshi Matsumoto
Radio Atmospheric Science Center
Kyoto University
Gokasho, Uji, Kyoto 611, Japan
Phone: 81-774-33-2532
Fax: 81-774-31-8463


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Instrument Logistics
Instrument Start Date: 1992-07-24
Instrument Owner: Radio Atmospheric Science Center, Japan