Journal of geomagnetism and geoelectricity
Online ISSN : 2185-5765
Print ISSN : 0022-1392
ISSN-L : 0022-1392
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Volume 16, Issue 4
Displaying 1-6 of 6 articles from this issue
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  • Radioactive Fallout Particles Collected by an Electrostatic Precipitator
    Akira HUZITA, Tetsuo MAMURO
    1964 Volume 16 Issue 4 Pages 221-228
    Published: April 20, 1965
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.16.221
    JOURNAL FREE ACCESS
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    A Gerdien type of ion chamber was used as an electrostatic precipitator to collect radioactive fallout. Aerosol particles were collected on different parts of the central electrode according to their ionic mobilities. The dust samples thus collected were investigated by γ ray spectrometry and microautoradiography. The experimental results indicate that aerosol particles which are attached by primary fallout particles of higher activity are charged multiply resulting in higher ionic mobilities presumably because they get a positive unit charge when they emit a β ray. This is in contrast with the fact that natural aerosol particles become mostly to be charged singly through attaching ions produced by natural radiation and radioactivity.
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  • Spherical Harmonic Analyses for the Spheroidal Earth
    A. B. KAHLE, J. W. KERN, E. H. VESTINE
    1964 Volume 16 Issue 4 Pages 229-237
    Published: April 20, 1965
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.16.229
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    Most spherical harmonic analyses of the surface geomagnetic field assume that the earth is a sphere. Two methods are devised for correcting the coefficients derived from such analyses for the oblateness of the earth's surface. The corrections required are shown to be significant. The largest, the change in the g30 coefficients, is about 80γ. The appearance of an erroneous unipole term in spherical harmonic representations of the geomagnetic field is discussed. The calculation of such a term is shown to yield information regarding absolute errors in geomagnetic data.
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  • Seasonal Dependence of SC-Field in Middle and Low Latitudes
    Rikio MAEDA, Naoshi FUKUSHIMA, Takesi NAGATA
    1964 Volume 16 Issue 4 Pages 239-246
    Published: April 20, 1965
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.16.239
    JOURNAL FREE ACCESS
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    An analysis of world-wide geomagnetic field-change for eight SC's during IGY indicates that the uniform northward external magnetic field for SC in middle and low latitudes shows a systematic seasonal dependence, namely, the uniform external magnetic field inclines towards the sunlit side in the summer hemisphere, and towards the night side in winter. This systematic seasonal dependence of the SC-field may be explained as due to the geometrical relation between the incident direction of the solar wind and the geomagnetic dipole axis.
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  • Hydromagnetic Radiation Due to the Mirroring Diamagnetic Particles
    Tsutomu TAMAO
    1964 Volume 16 Issue 4 Pages 247-265
    Published: April 20, 1965
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.16.247
    JOURNAL FREE ACCESS
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    Hydromagnetic radiations generated by the motion of energetic charged particles in a uniform cold plasma are investigated. A hydromagnetic Cherenkov radiation emitted by diamagnetic particles moving coherently along the uniform field lines is first discussed and its differential energy spectrum is obtained. Next, hydromagnetic disturbances of the isotropic mode due to the mirroring motion of diamagnetic particles are quantitatively studied. Frequency and intensity variations with time for the emitted signals are given in several numerical illustrations. It is shown that the frequency of arrived signals with an appreciable intensity decreases with increasing of time. This falling tone character is ascribed to the Doppler effect of the moving source with the decreasing velocity, when it is approaching toward the observing point.
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  • Low Latitude Whistler Echoes and an Estimate of Electron Density in the Outer Ionosphere
    Tadanori ONDOH, Chyoshiro NEMOTO
    1964 Volume 16 Issue 4 Pages 267-271
    Published: April 20, 1965
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.16.267
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  • Solar Flare Effect on the Ionospheric F2-Region
    Kunitomo SAKURAI
    1964 Volume 16 Issue 4 Pages 273-276
    Published: April 20, 1965
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.16.273
    JOURNAL FREE ACCESS
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