Journal of geomagnetism and geoelectricity
Online ISSN : 2185-5765
Print ISSN : 0022-1392
ISSN-L : 0022-1392
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Volume 27, Issue 4
Displaying 1-8 of 8 articles from this issue
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  • The TAIYO Mission
    Kunio HIRAO
    1975 Volume 27 Issue 4 Pages 265-270
    Published: 1975
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.27.265
    JOURNAL FREE ACCESS
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    The TAIYO (1975-014A), the third scientific satellite of Japan was launched on February 24, 1975. It is an aeronomy satellite designed to study the relation between solar radiations and the thermospheric structure. It was designated SRATS before launching. This article which describes the mission of the TAIYO is the introduction to the series of papers on the onboard experiments of TAIYO.
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  • A Solar X-Ray Detector aboard “TAIYO”
    Masaru MATSUOKA, Fukuo NAGAI, Ken-ichiro OHKI
    1975 Volume 27 Issue 4 Pages 271-277
    Published: 1975
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.27.271
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    An X-ray detector was mounted on the third Japanese scientific satellite “TAIYO” in order to search for solar X-rays produced by solar flares. This instrument is named “SXR, ” an acronym for Solar X-Ray. It is sensitive to two X-ray energy ranges of 5.9-9.5keV and 9.5-11.5keV and has an area of 3cm2. Its time resolution is about 8 seconds. Since it is also sensitive to charged particles, it can investigate the charged particle intensity distribution in the radiation belt and the nature of precipitation particles in the orbit when TAIYO is at around the perigee.
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  • An Intensity Monitor for Solar Hydrogen Lyman-α Radiation (TAIYO SXU)
    Takanori OSHIO, Toshio MASUOKA, Ichiro HIGASHINO, Norihiko WATANABE
    1975 Volume 27 Issue 4 Pages 279-294
    Published: 1975
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.27.279
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    The absolute intensity of hydrogen Lyman-alpha (1216Å) from the total solar disk is currently monitored by an ion chamber as a part of the satellite mission of TAIYO. The apparatus consists of an ion chamber with a special input control mask and associated electronics. The ion chamber with an MgF2 window and filled with NO gas is sensitive to a narrow spectral band including the Lα. The special mask serves to keep the angular response of the detector constant at the elevation angle of the sun relative to the plane perpendicular to the spinning axis of the satellite within an error of the order of one percent, when the angle is within ±30°. A flux reducer attenuates the incident radiation upon the detector by a factor of 20 to lengthen the life of detector. The associated electronics measures the output current of the ion chamber, holds the maximum value of the output every four-second period and sends it to the telemeter. From the currently observed data, the absolute intensity of the solar Lα is 3.2×1011photons/cm2sec and constant within ±4.2% during the period from 24 February to 31 May, 1975.
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  • The Atmospheric UV Instrumentation for the Satellite “TAIYO”
    Takao TOHMATSU, Katsuhisa SUZUKI, Toshihiro OGAWA
    1975 Volume 27 Issue 4 Pages 295-301
    Published: 1975
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.27.295
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    On February 24, 1975 the aeronomy satellite TAIYO (1975 14A) was launched from Uchinoura, Japan. The satellite is equipped with two middle ultraviolet radiometers and four vacuum ultraviolet photon counters which can measure the distribution of the ultraviolet emissions from the earth's atmosphere and from the space in the sun-earth vicinity. This article describes the instrumentation for the ultraviolet measurement by TAIYO.
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  • The Bennett Ion Mass Spectrometer aboard “TAIYO” (CPI)
    Iwao IWAMOTO, Takeshi SUITZ, Nobuyoshi FUGONO
    1975 Volume 27 Issue 4 Pages 303-310
    Published: 1975
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.27.303
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    On Feb. 24, 1975, a mass spectrometer was flown on the scientific satellite “TAIYO” to measure the composition of positive ions (CPI). The analyzer is a three-stage 5-3cycle Bennett type mass spectrometer. The CPI instrument detects the peak values of the mass spectra of O+, He+ and H+. The principle of operation, instrumental details and performances are described.
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  • The Retarding Potential Analyzer aboard the Satellite TAIYO
    Shigeru MIYAZAKI
    1975 Volume 27 Issue 4 Pages 311-320
    Published: 1975
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.27.311
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    A retarding potential analyzer is included among the satellite TAIYO payloads. A planar retarding potential trap is mounted on the top of the boom of the satellite. The primary object is to measure the ion temperature and density in the ionosphere and the lower part of the magnetosphere. The sensor and electronics are described.
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  • Electron Temperature Probe Experiments on the Satellite “TAIYO”
    Koh-ichiro OYAMA, Kunio HIRAO
    1975 Volume 27 Issue 4 Pages 321-330
    Published: 1975
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.27.321
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    A description is given of the electron temperature probe experiments on the SRATS (TAIYO) satellite. The basic measurement principle of the probe and the operational capabilities of the instrumentation are explained, as well as the laboratory plasma tests.
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  • Instrumentation and Observations of Gyro-Plasma Probe Installed on TAIYO for Measurement of Ionospheric Plasma Parameters and Low Energetic Particle Effects
    Hiroshi OYA, Akira MORIOKA
    1975 Volume 27 Issue 4 Pages 331-361
    Published: 1975
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.27.331
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    The capacitance of a spherical probe immersed in the ionospheric plasma is measured by a radio frequency impedance measuring instrument, that is called a gyro-plasma probe installed on TAIYO (the satellite launched on Feb. 24, 1975). The operation of gyro-plasma probe installed on TAIYO is characterized by automatic detection of the resonance point by filtering out the disturbance noise; the filtering effect is emphasized shifting the characteristic frequency for the admittance measurement down into a range much lower than a disturbing noise frequency. To avoid unexpected noise disturbances the cutoff frequecy of the filter is switched automatically between two values such as 40Hz and 150Hz, respectively. The measured capacitance reveals a rapid variation in the region of the South Altantic anomaly. This rapid variation is attributed to the low energy particle precipitation that is characterized by the evidence that flux of one species of the particle precipitation exceeds the flux of the other species, i. e., the ion flux exceeds the electron flux, and vice versa.
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