Journal of geomagnetism and geoelectricity
Online ISSN : 2185-5765
Print ISSN : 0022-1392
ISSN-L : 0022-1392
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Volume 4, Issue 2
Displaying 1-4 of 4 articles from this issue
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  • Prof. A. Tanakadate (1857-1952) M. Hasegawa
    M. HASEGAWA
    1952 Volume 4 Issue 2 Pages 41-43
    Published: November 20, 1952
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.5636/jgg.4.41
    JOURNAL FREE ACCESS
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  • The Electron Density of the D Region
    Teruo SATO
    1952 Volume 4 Issue 2 Pages 44-56
    Published: November 20, 1952
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.4.44
    JOURNAL FREE ACCESS
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    In this paper we study the electron density, its seasonal and daily variation, and the distribution for the height of the D region. For this purpose, the seasonal and daily variation of the reflection coefficient of the waves of 16kc/s and 150/s incident in the ionosphere were calculated assuming the distribution of the electron density, and maximum electron density N0 (though its existence is unceatain) of the D region and the collisional frequency ν0 at the height of N0.
    To calculate these values, the levels of the reflection of these waves were firstly discussed. Then N0, ν0, and the distribution of the electron density which give the reflection coefficient consistent with the results observed not only by the long wave but also by the short wave were deduced. It was found that
    (1) waves were reflected from the level x=sin2θ[yL2+Z2]1/2 and not x=sin2θ or x=sin2θ·Z,
    (2) the distribution of the electron density has the form such as N01/4(1-z-e-zsec χ) or a similar one,
    (3) the electron density at the height of 90km and 75km is 1.8×104/c.c. and 6×102/c.c. respectively in daytime in the summer and 9×103/c.c. and 3×102/c.c. in daytime in the winter,
    (4) if the region has the peak it is situated at the height of 92km-95km in daytime,
    (5) and the collisional faequency at 92km is 4×105/s.
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  • World-Wide Character of the Progressive Change in the Disturbance Forces of Geomagnetic Bays
    Naoshi FUKUSHIMA, Hironori ONO
    1952 Volume 4 Issue 2 Pages 57-62
    Published: November 20, 1952
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.4.57
    JOURNAL FREE ACCESS
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    The vector-diagrams illustrating the change in the disturbance forces during the whole course of geomagnetic bays, show the same characteristics everywhere in the middle latitude regions; namely the disturbance force vector rotates clockwise with time in the forenoon and counter-clockwise in the afternoon, and the above characteristic corresponds to broadening of the positive bay area over the earth's surface during the course of bay. It is also noticed that the average current system of bay disturbance tends to shift eastward on the whole during its development and decay processes.
    In the disturbance force of bays observed at Sitka, the influence of the auroral zone current is clearly seen. On the other hand, the disturbance force at Honolulu is so small in its magnitude that the bays' character is less systematic there compared with those in the middle latitude regions.
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  • Dynamo-Theoretical Conductivity and Current in the Ionosphere
    Ken-ichi MAEDA
    1952 Volume 4 Issue 2 Pages 63-82
    Published: November 20, 1952
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.4.63
    JOURNAL FREE ACCESS
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    Tensor expressions of anisotropic velocity and conductitivity of a simple ionized gas in magnetic field is applied to the ionosphere as a heterogeneous ionized medium. It is shown that the vertical electric current in the ionosphere is suppressed down to a negligible magnitude, and under this condition the specific conductivities of the ionosphere are derived. With these conductivities the dynamo-theoretical equation is constructed and solved for some special models of the ionosphere. The directional conductivities of the ionosphere are introduced and explained. The vertical motion of electrons and ions in the ionosphere is considered and its importance is briefly noted from the viewpoint of the ionospheric distribution.
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