Journal of geomagnetism and geoelectricity
Online ISSN : 2185-5765
Print ISSN : 0022-1392
ISSN-L : 0022-1392
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Volume 11, Issue 1
Displaying 1-5 of 5 articles from this issue
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  • Geomagnetic Distortion of the F2 Region on the Magnetic Equator (II)
    Hiroshi MAEDA
    1959 Volume 11 Issue 1 Pages 1-5
    Published: September 15, 1959
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.11.1
    JOURNAL FREE ACCESS
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    The change that takes place with the sunspot cycle of distortional characteristics in the daily variation of the F2-region on the magnetic equator is investigated herewith using Huancayo data during about one sunspot cycle. It is found that the type of the daily variation of f0F2 shows a systematic change with the sunspot cycle and that this change in type of f0F2 daily variation is also fairly closely connected with the phase shift in the geomagnetic Sq variations. Thus it would be confirmed that the change in type of the daily variation of f0F2 with the sunspot cycle is interpreted mainly by the phase shift of the vertical drift, associated with the geomagnetic variation.
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  • 27-Day Recurrence of Cosmic-Ray Intensity at the Minimum Solar Activity
    Masahiro KODAMA
    1959 Volume 11 Issue 1 Pages 6-10
    Published: September 15, 1959
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.11.6
    JOURNAL FREE ACCESS
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    There exists, in general, the close negative correlation between the 27-day recurrence tendency of cosmic rays and that of solar activity. Both recurrences have, however, the positive correlation during several months at the minimum solar activity. This phenomenon suggests that there may be at all times some solar emission of cosmic-ray particles, which is not observable except the short period at the minimum solar activity.
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  • Recovery of Cosmic-Ray Intensities after the “Forbush-Type Decrease”
    Teiichiro YAGI
    1959 Volume 11 Issue 1 Pages 11-20
    Published: September 15, 1959
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.11.11
    JOURNAL FREE ACCESS
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    By use of Chree's superposed-epoch method, investigation was made of the recoveries of cosmic-ray intensities, horizontal components of geomagnetic field and sunspot areas following remarkable “Forbush-type decrease.” (1) Cosmicray intensities and horizontal components of the geomagnetic field show recovery curves which resemble each other, but the curve of sunspot areas remains as a lower level than those of the former two. (2) Cosmic-ray intensities show an exponential recovery until the 26th day, with 14.7 days mean life. On the other hand, sunspot areas show such recovery until only the 11th day, with 7.3 days mean life. (3) On the recovery-curve of logarithms of cosmic-ray intensity decrements, there exists a knee at the 4th day. It is proposed as an assumption that this knee corresponds to the escape of the earth out of the corpuscular stream ejected from the sun.
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  • Motions of Solar Cosmic Rays and the Properties of the General Magnetic Field of the Sun
    Kunitomo SAKURAI
    1959 Volume 11 Issue 1 Pages 21-33
    Published: September 15, 1959
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.11.21
    JOURNAL FREE ACCESS
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    By the solar magnetic observations, it seems that the sun has a magnetic field of dipole character such that the intensity is about one gauss in the polar latitude regions and its polarity is inverse that of the earth. If this field results from a magnetic dipole that the sun may have, the value of this dipole moment is estimated as about 5×1032 gauss. cm3. On the assumption that the magnetic field from this dipole spreads out the outer space surrounding the sun, the orbits of the solar cosmic ray particles have been calculated based on some additive assumptions. It is concluded from these results that the solar dipole magnetic field mentioned above does not exist between the sun and the earth as it is since the existence of this field can not explain phenomena of the cosmic ray unusual increases associated with the large solar flares observed five times during the past. Therefore, although the magnetic field extending from the polar regions into the outer space is regarded as closing each other in this space, the features of this field may be remarkably different from the dipole character. Then, a probable configuration in the interplanetary space of the solar general magnetic field is introduced and discussed.
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  • The Critical B-Values in the Geomagnetic Effect of Cosmic Rays
    Kunitomo Sakurai
    1959 Volume 11 Issue 1 Pages 34-36
    Published: September 15, 1959
    Released on J-STAGE: September 14, 2010
    DOIhttps://doi.org/10.5636/jgg.11.34
    JOURNAL FREE ACCESS
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