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    Some Notes on the Interpretation of Rapid Fluctuations in Earth-Currents Observed in High Latitudes

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    GI Reports 86.pdf
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    1.189Mb
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    Author
    Sugiura, Masahisa
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    URI
    http://hdl.handle.net/11122/3551
    Abstract
    This paper shows that a periodically varying infinite linear current, or a periodically varying turbulent circular current of small radius (here approximated by a magnetic dipole with a changing dipole moment), in the ionosphere, which will give rise to magnetic variations of observed order of magnitude, is adequate for producing voltage differences in the ground of order 0 .1 to 1 volt per kilometer that are frequently observed in high latitudes during disturbed periods. It appears difficult to interpret the earth-current record in terms of its primary origin, unless the distribution of the perturbing magnetic field and that of electric conductivity of the earth are both adequately known. However, the earth-current record is a good indicator of the upper atmospheric disturbance in the polar regions.
    Description
    [PREFACE] This report was prepared as a part of the Interdisciplinary study of the upper atmospheric disturbance in the polar regions that is conducted at the Geophysical Institute under Dr, C. T. Elvey, Director of the Institute. The report is primarily intended for the student of geophysics who is interested in this subject. A part of the mathematical procedure that was previously given by Prof. A. T. Price (reference 9 in end of paper) is included in Sections 4 to 6 with some modifications so as to enable the student to follow, without referring to Prof. Price’s paper, the derivation of the formulae which are used in the present discussion* and to apply the method to similar problems. November 15, 1958 M. S.
    Date
    1958-12
    Source
    Geophysical Institute
    Publisher
    Geophysical Institute at the University of Alaska
    Type
    Report
    Peer-Reviewed
    Yes
    Collections
    GI Reports

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