Journal of geomagnetism and geoelectricity
Online ISSN : 2185-5765
Print ISSN : 0022-1392
ISSN-L : 0022-1392
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Volume 6, Issue 1
Displaying 1-5 of 5 articles from this issue
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  • Thermo-Magnetic Study of Ferromagnetic Minerals Contained in Igneous Rocks
    Syun-iti AKIMOTO
    1954 Volume 6 Issue 1 Pages 1-14
    Published: April 30, 1954
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.6.1
    JOURNAL FREE ACCESS
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    The change with temperature in intensity of magnetization of ferromagnetic mineral grains separated from the igneous rocks was measured in a strong magnetic field by means of a magnetic balance. The intensity of saturation magnetization and the Curie point of ferromagnetic minerals of titanomagnetite series, which are commonly found in natural igneous rocks as the solid solution of TiFe2O4 and Fe3O4, were examined in taking their chemical and crystallographic properties into consideration. Linear relations between each two of the chemical composition, the lattice parameter, the Curie point and the intensity of saturation magnetization were found as the first approximation. Besides, it was found that there exist natural ferromagnetic minerals in ilmenite—hematite series having the peculiar type of their thereto-magnetic curve.
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  • On the 27-Day Recurrence of the Cosmic-Ray Diurnal Variation
    Sekiko YOSHIDA, Ichiro KONDO
    1954 Volume 6 Issue 1 Pages 15-21
    Published: April 30, 1954
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.6.15
    JOURNAL FREE ACCESS
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    27-day recurrence of the cosmic-ray diurnal variation was found from the analysis of the data observed at Huancayo during the period 1936-1940. Similar analysis was done on the daily mean values of cosmic-ray intensity and geomagnetic activities. Among them the recurrence of the cosmic-ray diurnal variation was the most persistent, and that of the daily mean cosmic-ray intensity was the next.
    It was suggested that the most of the cosmic-ray diurnal variation may be interpreted as the storm effect.
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  • Anisotropy of Cosmic Rays Observed with an Alt-azimuth Telescope
    Yataro SEKIDO, Sekiko YOSHIDA, Yoshiko KAMIYA
    1954 Volume 6 Issue 1 Pages 22-33
    Published: April 30, 1954
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.6.22
    JOURNAL FREE ACCESS
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    Intensity distribution of cosmic rays over the celestial sphere was scanned with an alt-azimuth counter telescope of a narrow angular resolution, kept nearly horizontal so that the effective cosmic-ray particles were free from complicated geomagnetic deflection. The result suggests the existence of narrow anisotropies, i. e. something like point sources. The charge and the average momentum of the cosmic-ray particles, with which the narrow anisotropies were distinguished, were observed to be positive and 2 Størmers respectively.
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  • An Analysis of Electric Field after Lightning Discharges
    Yuichi TAMURA
    1954 Volume 6 Issue 1 Pages 34-46
    Published: April 30, 1954
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.6.34
    JOURNAL FREE ACCESS
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    Analysis is based on a following set of simple assumptions. A thundercloud is represented by a vertical dipole of positive polarity. Electrical conductivity of the atmosphere increases exponentially with height, and not altered by presence of thundercloud. Electromotive force in thundercloud is represented by a constant current generator. It is taken that an electric field consists of three parts. The first is field due to charge in each pole which increases at a rate depending on electrical conductivity of the air at a height of pole; the second, due to space charge which grows with charges in poles; the third, due to free decaying space charge which is released after a lightning discharge. Characteristic dissimilarity of the form of field recovery curve, observed after a near discharge to that of distant discharge, is well interpreted by this analysis.
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  • Rock Magnetism as a Temperature Indicator
    H. MANLEY
    1954 Volume 6 Issue 1 Pages 47-51
    Published: April 30, 1954
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.6.47
    JOURNAL FREE ACCESS
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    The magnetic properties of a suite of Scotch dykes are given briefly and the results afford a good correlation with their degree of metamorphism. The intensity of remanent magnetisation falls rapidly with increase of metamorphism. The unaltered dyke material described here is believed to be a case of remanent magnetism in the oldest rocks yet mentioned in literature.
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