Journal of geomagnetism and geoelectricity
Online ISSN : 2185-5765
Print ISSN : 0022-1392
ISSN-L : 0022-1392
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Volume 30, Issue 6
Displaying 1-4 of 4 articles from this issue
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  • Absolute Sensitivity of a High-μ Metal Core Solenoid as a Magnetic Sensor
    K. HAYASHI, T. OGUTI, T. WATANABE, L. F. ZAMBRESKY
    1978 Volume 30 Issue 6 Pages 619-630
    Published: 1978
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.30.619
    JOURNAL FREE ACCESS
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    An experiment was carried out for a precise calibration of the absolute sensitivity of a high-μ metal core solenoid used as a sensor of an induction magnetometer. The high-μ metal core induction magnetometer was operated simultaneously with an air-core loop antenna induction magnectometer system which has a known absolute sensitivity. The two systems were run at Churchill, Manitoba in February, 1977. A moderately intense quasisinusoidal Pc 1 event recorded by both systems on the vertical component was made use of as a calibration signal. Comparison of the outputs from the two induction magnetometers made it possible to determine the sensitivity of the high-μ metal core solenoid. A theory was also presented to calculate the absolute sensitivity of a high-μ metal core solenoid. Agreement between the theory and the experiment is good. The theory shows us how to design a reliable and portable high-sensitivity solenoid.
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  • Equatorial Enhancement of SSC Magnitudes
    R. P. KANE
    1978 Volume 30 Issue 6 Pages 631-646
    Published: 1978
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.30.631
    JOURNAL FREE ACCESS
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    Storm sudden commencement (SSC) magnitudes are known to be generally larger in the equatorial electrojet region. This aspect is studied in detail and it is shown that the equatorial enhancement ratio fluctuates over a very wide range and is not always commensurate with the equatorial electrojet strength. Large ratios during weak or reverse (counter) electrojets are not uncommon. During nights when electrojet is very small, ratios greater than, lesser than or equal to unity are observed. During daytime too, ratios as low as unity (no equatorial enhancement) are sometimes observed even when the electroject is strong
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  • Comparison of Storm-Time Changes of Ionospheric Total Electron Content at Nearby Locations in Mid-Latitudes
    R. P. KANE
    1978 Volume 30 Issue 6 Pages 647-662
    Published: 1978
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.30.647
    JOURNAL FREE ACCESS
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    The changes in the total electron content (TEC) at some mid-latitude locations in the American zone are compared during nine geomagnetc storms which are comparatively clean (clear-cut single main phase). It is found that TEC changes are sometimes related to sudden storm commencement (SSC) and sometimes to main phase onset (MPO) and the changes are sometimes positive and sometimes negative with no obvious relationship either with season or with any particular phase of the geomagnetic storm. It is concluded that there is no direct cause-effect relationship between ionospheric changes and changes of geomagnetic field as such and the only thing common between these is their common source viz, impact of interplanetary plasma blobs while subsequent evolutions are independent and unrelated.
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  • Balloon Observations of Auroral X-Rays in Canada
    I. Determination of Auroral X-Ray Illuminating Regions
    Takamasa YAMAGAMI, Masami FUJII, Jun NISHIMURA, Hiroyuki MURAKAMI, Yo ...
    1978 Volume 30 Issue 6 Pages 663-682
    Published: 1978
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.30.663
    JOURNAL FREE ACCESS
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    Two balloons each carrying a payload consisting of three sets of NaI(Tl) scintillation counters have been launched from Thompson, Manitoba, Canada, in April 1975, to search precipitating mechanisms of auroral particles through observations of the bremsstrahlung X-rays in conjugation with the geo-stationary statellite ATS-6. Two omnidirectional counters, one of which had the modulation collimator, were used together with the directional counter inclined from the zenith. On the basis of the spin-modulated data obtained during the appearance of two distinct auroral X-ray bursts, two-dimensional source models, arc- and disc-shaped, are proposed for the auroral X-ray illuminating region. Also shown is an example of the eastward drift of another auroral X-ray source. Some of problems related to the analyses of data, i. e., background fluxes due to cosmic rays, and the response functions of the detectors are discussed.
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