Journal ArticleDOI
EXOS-D (AKEBONO) very low frequency plasma wave instruments (VLF)
Kozo Hashimoto,Isamu Nagano,Masayuki Yamamoto,Toshimi Okada,Iwane Kimura,Hiroshi Matsumoto,Hidetaka Oki +6 more
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TLDR
The Akebono (EXOS-D) satellite has been successfully observing the Earth's magnetosphere since it was launched on February 21, 1989 as discussed by the authors, and the instruments have successfully measured the wave spectra, the wave normal vectors, the precise wave intensities, the antenna impedance, etc.Abstract:
The Akebono (EXOS-D) satellite has been successfully observing the Earth's magnetosphere since it was launched on February 21, 1989. The objectives of VLF instruments on board the satellite were to investigate the behavior of plasma waves associated with accelerated auroral particles, wave-particle interaction mechanisms, and propagation characteristics of whistler-mode waves in the magnetosphere. The instruments measured not only the dynamic spectra of VLF waves up to 15 kHz by a wideband receiver, but also their absolute field intensities, wave normal vectors, and Poynting vectors. Two electric and three magnetic components with a bandwidth of about 50 Hz up to 12.5 kHz are sent to measure the wave normal vectors and Poynting vectors. The antenna impedance is measured to determine the correct absolute electric field intensities. The instruments have successfully measured the wave spectra, the wave normal vectors. Poynting vectors, the precise wave intensities, the antenna impedance, etc. The present paper describes the unique features of the instruments, especially the Poynting flux analyzers in more detail. Obtained scientific results are also reviewed.read more
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Journal ArticleDOI
Inner belt and slot region electron lifetimes and energization rates based on AKEBONO statistics of whistler waves
Oleksiy Agapitov,Oleksiy Agapitov,Oleksiy Agapitov,Anton Artemyev,Anton Artemyev,Didier Mourenas,Yoshiya Kasahara,Vladimir Krasnoselskikh +7 more
TL;DR: In this article, the amplitude distribution of hiss, lightning-generated, and other whistler mode waves from terrestrial VLF transmitters were obtained from the EXOS-D (Akebono) satellite in the Earth's plasmasphere and fitted as functions of L and latitude for two geomagnetic activity ranges (Kp 3).
Journal ArticleDOI
ELF/VLF waves correlated with transversely accelerated ions in the auroral region observed by Akebono
Yoshiya Kasahara,Tomohisa Hosoda,Toshifumi Mukai,Shigeto Watanabe,Iwane Kimura,Hirotsugu Kojima,Ryotaro Niitsu +6 more
TL;DR: In this article, a waveform analysis revealed that the electrostatic broadband noise is classified into two types of noise: one is continuous noise with upper cutoff around a few kilohertz, and the other is an intermittent impulsive waveform extended more than 10 kHz.
Journal ArticleDOI
Artificial modification of Earth’s radiation belts by ground-based very-low-frequency (VLF) transmitters
Journal ArticleDOI
Software wave receiver for the SS-520-2 rocket experiment
TL;DR: The specifications and roles of the software wave receiver on the SS-520-2 rocket experiment are described and the first flight test of the new plasma wave receiver to be used for future planet explorers and space observation missions is reported on.
Book ChapterDOI
Whistler Mode Chorus Observed Around the Plasmapause During Magnetic Storms
TL;DR: In this paper, the authors performed direction finding analysis of the chorus using wave distribution function (WDF) method and quantitatively estimated the energies of whistler mode wave and relativistic electrons during recovery phase of magnetic storm.
References
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Journal ArticleDOI
The Biquad: Part I-Some practical design considerations
TL;DR: In this paper, a comprehensive report on the Biquad, an active topology based on analog computer concepts, is given, where the authors describe the electrical characteristics of Biquads that make it a manufacturable realization for precision networks.
Journal ArticleDOI
Plasma Wave Observations with GEOTAIL Spacecraft
Hiroshi Matsumoto,Isamu Nagano,Roger R. Anderson,Hirotsugu Kojima,Kozo Hashimoto,Minoru Tsutsui,Toshimi Okada,Izumi Kimura,Yoshiharu Omura,Masaki Okada +9 more
TL;DR: The GEOTAIL plasma wave instrument (PWI) as discussed by the authors is composed of three distinct sets of receivers: (1) the Sweep Frequency Analyzer (SFA), (2) the Multi-Channel Analyzer(MCA), and (3) the Wave-Form Capture (WFC).
Journal ArticleDOI
The ISEE-1 and ISEE-2 Plasma Wave Investigation
TL;DR: In this paper, the ISEE-1 and ISEE2 plasma wave investigation is designed to provide basic information on waveparticle interactions in the earth's magnetosphere and in the solar wind.
Journal ArticleDOI
Plasma wave observation and sounder experiments (PWS) using the Akebono (EXOS-D) satellite ― instrumentation and initial results including discovery of the high altitude equatorial plasma turbulence
Hiroshi Oya,Akira Morioka,Kaori Kobayashi,Masahide Iizima,Takayuki Ono,Hiroshi Miyaoka,Toshimi Okada,Takahiro Obara +7 more
TL;DR: In this article, the results of the PWS/EXOS-D data are summarized as follows: upper hybrid emissions that cover a frequency range from the electron cyclotron frequency fC to the upper hybrid frequency fUHR are always observed in the altitude range from 1000km to apogee of the orbit of the satellite.
Journal ArticleDOI
Propagation characteristics of the ELF emissions observed by the satellite Akebono in the magnetic equatorial region
TL;DR: In this paper, the wave normal direction of an ion cyclotron wave near the meridian plane was estimated by using the wave distribution function method and it was found that the wave can propagate around the plasmapause because of the trapping effect of density gradient.