Journal of geomagnetism and geoelectricity
Online ISSN : 2185-5765
Print ISSN : 0022-1392
ISSN-L : 0022-1392
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Volume 32, Issue 9
Displaying 1-6 of 6 articles from this issue
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  • Energetic-Particle Populations and Cosmic-Ray Entry
    Michael SCHULZ
    1980 Volume 32 Issue 9 Pages 507-549
    Published: 1980
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.32.507
    JOURNAL FREE ACCESS
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    This paper constitutes a review of recent progress in the study of chargedparticle access, transport, and loss with respect to the earth's magnetosphere. A major objective of studying particle access is to identify the sources of trapped and quasi-trapped radiation. Important progress in this area involves the measurement of comparative ionic abundances in the radiation belts. The historic problem of accounting for cosmic-ray cut-off latitudes as a function of particle energy is being solved by the adoption of increasingly realistic and accurate models of the magnetospheric B field. Progress in the estimation of particle-transport coefficients (mainly diffusion coefficients) involves the measurement of fluctuating electric and magnetic fields on the ground, at balloon altitudes, and in space. The importance of particle interactions with discrete waveforms (as distinguished from broad-banded spectral noise) is increasingly being recognized. For example, the unsteady magnetospheric convection associated with substorms contributes importantly to radial diffusion, whereas cyclotron resonance with chorus elements and other discrete excitations may contribute importantly to pitch-angle diffusion and (thus) to the loss of energetic particles from the magnetosphere. The role of man-made signals such as radio transmissions and power-line harmonics in this latter process remains uncertain and continues to be debated.
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  • Ion Composition Distribution above the Ionospheric F-Layer Obtained by a Rocket-Borne Ion Mass Spectrometer
    Eiichi SAGAWA, Iwao IWAMOTO, Takeshi SUITZ
    1980 Volume 32 Issue 9 Pages 551-559
    Published: 1980
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.32.551
    JOURNAL FREE ACCESS
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    Ion composition above the ionospheric F-layer was measured by an ion mass spectrometer on board the L-3H-9 rocket. The spectrometer was a type of the quadrupole mass filter with a channel electron-multiplier serving as the ion detector. The rocket was launched from Uchino-ura, Japan at 2015 JST on August 16, 1977, under the geomagnetically quiet conditions of F10.7=85 and Kp=2-. Altitude profiles of four ionic species of H+, He+, N+, and O+ were obtained between 450 and 1, 100km. The transiton from the O+-predominant ionosphere to an H+-dominant region occurred at 750km. The scale height of the [H+]/[O+] ratio was analyzed in order to deduce the ion and neutral temperatures. The experimentally determined neutral temperature at 500km showed a good agreement with that of a model atmosphere.
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  • Ionospheric Variations during the 13 September 1967 Storm: Incoherent Scatter Radar Results
    M. K. GOEL, B. C. N. RAO
    1980 Volume 32 Issue 9 Pages 561-565
    Published: 1980
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.32.561
    JOURNAL FREE ACCESS
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    The storm time variations in Ne, Te, and ion drifts are studied for a mid-latitude station, St. Santin (44.11°N, 2.3°E) using incoherent scatter radar data. It is observed that there is an increase in Ne with a corresponding decrease in Te at 350km and the drifts are upward when compared with the quiet time drifts. These drifts are shown to be related to changes in magnetic field and hence they may be due to an electrodynamic effect. It is established from the Ne and Te profile changes that the differences in the ionospheric effects at different times reported earlier by the authors for the same storm are due to the storm-time effect and not due to a longitude effect.
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  • Magnetic Properties of Pillow Basalt from the Kinan Seamount Chain, the Shikoku Basin
    Toshio FURUTA, Shyoji TONOUCHI, Masao NAKADA
    1980 Volume 32 Issue 9 Pages 567-573
    Published: 1980
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.32.567
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    Tholeiitic pillow basalt dredged from the Hakuho seamount located in the Kinan seamount chain, the Shikoku Basin, has peculiar magnetic properties; wide range intensity and high stability of natural remanent magnetization (NRM), low susceptibility, high initial Curie temperature and relatively small lattice constant. Four specimens of the pillow basalt have been cored from rim to center of one boulder sample. The NRM intensity decreases from center to rim, but the stability increases from center to rim. Reduced intensity of NRM in the rim is possibly caused by a high degree of low temperature oxidation. High magnetic stability is due to the very fine size of ferromagnetic minerals.
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  • Preliminary Results of the Simultaneous Observation of Whistlers in Low Latitudes
    Kazuoki KURIMOTO
    1980 Volume 32 Issue 9 Pages 575-579
    Published: 1980
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.32.575
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  • Geomagnetic Secular Variation Recorded in the Stable Magnetic Remanence of the Young Sediments Collected from Osaka Bay
    Masayuki HYODO, Katsumi YASKAWA
    1980 Volume 32 Issue 9 Pages 581-584
    Published: 1980
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.5636/jgg.32.581
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