Journal of geomagnetism and geoelectricity
Online ISSN : 2185-5765
Print ISSN : 0022-1392
ISSN-L : 0022-1392
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Volume 8, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • Intensity Problem in the Deflection of Cosmic Rays in the Solar Magnetic Field
    Teiichiro YAGI
    1956 Volume 8 Issue 3 Pages 87-92
    Published: 1956
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.8.87
    JOURNAL FREE ACCESS
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    Assuming uniform parallel beam of cosmic rays at infinity is deflected in the general magnetic field of the sun, cosmic-ray intensities at each point of the earths' orbit were calculated. Problem was treated only in the equatorial plane for simplicity. As the intensities change with season, the solar diurnal variation averaged over all season never tends to zero due to the heliomagnetic deflection of cosmic rays.
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  • Diurnal Variation of Vertical Cosmic Rays
    Narrow Total and High Energy Components
    Teiichiro YAGI, Hiroyuki UENO
    1956 Volume 8 Issue 3 Pages 93-107
    Published: 1956
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.8.93
    JOURNAL FREE ACCESS
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    It is well known that anomalous solar diurnal variation SD of cosmic rays appears at the time of geomagnetic storms. We confirmed the existence of SD about the cosmic-ray intensities of total component and high energy component penetrating 90cm lead absorber measured with narrow angle telescope directed vertically. Amplitude of SD of the total component is the largest and the time of maximum intensities of that of the high energy component is the latest. The phases of SD are different with five different kinds of cosmic-ray meters in our country. This can be understood qualitatively by the deflections of cosmic rays in the earth's magnetic field. Year to year variation of phase of SD and long-time variation of amplitude of mean diurnal variation were investigated.
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  • The Measurement of Magnetic Hysteresis in Rocks and Minerals at High Temperatures
    E. R. DEUTSCH
    1956 Volume 8 Issue 3 Pages 108-117
    Published: 1956
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.8.108
    JOURNAL FREE ACCESS
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    An experimental method is described, designed chiefly to furnish data for a study of the direction, and stability with time, of thermoremanence in rocks. Specimens were heated to the Curie point in an evacuated electric furnace. Two pick-up coils were arranged close to the gap of a tuned a. c. electromagnet providing a maximum field H of 2400 oersteds. These were balanced to make their resultant e. m. f. zero in the presence of H alone, and proportional to dI/dt when a specimen of intensity of magnetization I was in the gap. This e. m. f. was applied to the vertical plates of a cathode ray oscilloscope. The potential drop over a small resistance in the electromagnet input was applied to the deflection coils, giving a measure of H. Computations based on the resulting pattern on the c. r. o. screen yield a loop of the I-H type, with I in arbitrary units, from which the coercivity can be evaluated. A pronounced “sawtooth” pattern has been observed in the (dI/dt)-H traces of pyrrhotite and franklinite specimens, particularly just below the respective Curie points.
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  • The Magnetic Hysteresis of Rocks and Minerals at High Temperatures
    E. R. DEUTSCH
    1956 Volume 8 Issue 3 Pages 118-128
    Published: 1956
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.8.118
    JOURNAL FREE ACCESS
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    The coercivity, remanence and saturation magnetization of a number of minerals and rocks have been obtained as a function of temperature, using alternating fields up to 2300 oersteds. These results suggest that most of the specimens examined can retain thermoremanence for long periods, even at high temperatures. Irregularities occurring in some of the temperature curves indicated the presence of more than one ferromagnetic constituent. Heat treatment in several cases caused considerable changes in the hysteresis curves measured at atmospheric temperatures. The thermomagnetic behaviour of two basalts has supported the view that the reversed magnetization of certain rock formations is due, not to abnormal magnetic properties on the part of the material concerned, but to a past reversal of the geomagnetic field.
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