Journal of geomagnetism and geoelectricity
Online ISSN : 2185-5765
Print ISSN : 0022-1392
ISSN-L : 0022-1392
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Volume 9, Issue 3
Displaying 1-5 of 5 articles from this issue
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  • The General Expression of the Diurnal Variation of the Atmospheric Electric Field Considering the Influence of the Eddy Diffusion near the Ground
    Minoru KAWANO
    1957 Volume 9 Issue 3 Pages 123-132
    Published: 1957
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.9.123
    JOURNAL FREE ACCESS
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    The diurnal variation curves of the atmospheric electric field, conductivity and space charge at Hongo, Tokyo, were described, and the local anomaly of these curves in urban condition was fairly well clarified.
    Considering the influence of eddy diffusion, we discussed the ionization equilibrium process near the ground. The result of the calculation permitted us to estimate the vertical distribution of the air resistivity. Using the vertical distribution, the local characteristic of the atmospheric electric field was derived on the theoretical basis from the fundamental equation.
    According to the results, the atmospheric electric field is proportional to the space charge and the square root of the coefficient of eddy diffusivity. This consideration shows that the diurnal variation of the atmospheric electric field can be explained by the fundamental equation of the electro-magnetic field assuming the Ohm's law.
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  • Simultaneous Measurements of the Air Earth Current and the Atmospheric Electric Potential Gradient
    Miyoji GOTO
    1957 Volume 9 Issue 3 Pages 133-139
    Published: 1957
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.9.133
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    The main difficulty in measurements of the air earth current lies in the elimination of displacement current caused by short period variations of the atmospheric electric field. An apparatus free from this difficulty was constructed and observations were carried out. It is ascertained that this apparatus can be well used in fine weather condition as well as in thunderstorm time. Some simultaneous records of the air earth current and the atmospheric electric field are shown.
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  • Magnetism of the Earth Crust
    Naoto KAWAI
    1957 Volume 9 Issue 3 Pages 140-156
    Published: 1957
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.9.140
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    In Part 1 the present writer proposes a method by which the pressure and temperature conditions under which rocks have been formed can be clarified from mesurements of magnetic state of rock-forming minerals. The method is established by being based upon observations of piezo-thermal equilibria of titaniferous ferrites and silicates which are prevailing in the lithosphere.
    In Part 2 is described the details of the method mentioned above.
    In Parts 3 and 4 are discussed the following subjects:
    1) Zone of titaniferous ferrite in the crust,
    2) Separation of the crust into three magnetically different layers; namely the uppermost layer of ferromagnetism due to ferrite, the middle layer of paramagnetism due to titaniferous ferrites and the lowest layer of paramagnetism without titaniferous ferrites,
    3) Region of thermo-remanent magnetism,
    4) Composition and Curie point of ferrite as the indicator of the depth at which plutonic rocks were formed initially.
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  • A Modification of the Method of E. R. Deutsch for the Magnetic Hysteresis of Rocks
    F. D. STACEY, L. G. PARRY
    1957 Volume 9 Issue 3 Pages 157-161
    Published: 1957
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.9.157
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    Measurements have been made of the phase angle, φ, by which the magnetic flux in a transformer core with an adjustable gap lags behind the 50c. p. s. magnetising current. The lag is shown to be 3.5° for typical silicon steel laminations carrying an R. M. S. flux density of 600 to 2400e. m. u. In the method of E. R. Deutsch [1] this lag is assumed to be zero, leading to errors in the hysteresis curves observed and an error H0sinφ in the measured coercive forces, where H0 is the amplitude of the magnetising field. It is concluded that the best method of obtaining a voltage proportional to the field in the gap of a magnet operated with alternating current is to use a search coil and an electronic integrating circuit.
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  • Positional Intermixing of the Normal and the Reverse Magnetizations of the Kawajiri-misaki Basalt Lavas
    Eizo ASAMI
    1957 Volume 9 Issue 3 Pages 162-164
    Published: 1957
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.9.162
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