Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
Volume 16, Issue 5
Displaying 1-5 of 5 articles from this issue
  • Kazuo Kawabe, Yoshiyuki Yasojima, Yoshio Inuishi
    1966 Volume 16 Issue 5 Pages 322-332
    Published: 1966
    Released on J-STAGE: March 04, 2011
    JOURNAL FREE ACCESS
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  • Kiwamu Sugisaki
    1966 Volume 16 Issue 5 Pages 337-346
    Published: 1966
    Released on J-STAGE: March 04, 2011
    JOURNAL FREE ACCESS
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  • K. Nishikawa
    1966 Volume 16 Issue 5 Pages 348-359
    Published: 1966
    Released on J-STAGE: March 04, 2011
    JOURNAL FREE ACCESS
    On the basis of the magnetohydrodynamic equations, the effect of density fluctuations on the frequency dependent electrical conductivity of a weakly ionized isothermal plasma is investigated. Only the case in which the magnetic field is static and homogeneous and in which the external electric field is parallel to the magnetic field is considered. The density fluctuations or waves are assumed to be formed by a certain driving force which acts either only on the electrons or only on the ions. The approximations involved are i) the neglect of the inertia term, ii) the neglect of the mode-mode coupling term except when it acts as a driving force and iii) the neglect of the response of the driving force to the external electric field. Some special cases are considered in detail. In particular, when a 6tatic density fluctuation is formed by a driving force acting only on the ions, the d. c. conductivity becomes the same as was obtained by Yoshikawaa1) using a more intuitive argument. In general, in the absence of a magnetic field, the effect of fluctuations on the conductivity depends little on whether the driving force is acting on the electrons or on the ions, provided that the characteristic frequencies are much samaller than the electron plasma frequency, but much larger than the ion collision frequency. A difference arises, however, when the magnetic field dependence is considered, i.e. the dependence of the d. c. current on the magnetic field takes place through the electron cyclotron frequency when the driving force is acting on the ions and through the on cyclotron frequency when it is acting on the electrons. This difference, however, disappears at high frequencies at which the ions can no longer follow the variation of the external electric field; in this case the magnetic field dependence takes place only through the electrcn cyclotron frequency.
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  • Ryosuke Matsuoka, Kazuo Minami, Susumu Takeda
    1966 Volume 16 Issue 5 Pages 360-389
    Published: 1966
    Released on J-STAGE: March 04, 2011
    JOURNAL FREE ACCESS
    There appears the elliptically rotated Faraday effect for microwaves transmitted through lossy plasmas with magnetic field. The detector signal of an electric field component of the wave through plasmas oscillates for the monotonous decrease of the plasma electron density, where the cyclotron frequency is higher than the applied frequency. It is shown that the electron density and the collision frequency can be cletei-Tnined from the maxima and the minima of the detector signal.
    From the detected microwave signal through an afterglow plasma in a waveguide in pressures of 2 and 5 mmHg in Neon or Argon, the electron density decays from 1012-1010cm-3 with time are determined for different magnetic fields from 3400 to 6000 Gauss. These decays show, reasonable values of trio recombination coefficient in the later period, where the electron energy rel, sxes to the thermal equilibrium with the gas temperature, because the recombination loss predominates for these afterglow plasmas with radial diffusion suppressed by the strong magnetic field.
    The collision frequencies of electrons with ions, which predominate over those with neutral atoms under this experimental condition are determined and plotted versus the electron density. A plausible explanation is discussed for these values somewhat higher than the theoretical ones.
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  • Y. Sunami, A. Tsuji, H. Narumi
    1966 Volume 16 Issue 5 Pages 390-393
    Published: 1966
    Released on J-STAGE: March 04, 2011
    JOURNAL FREE ACCESS
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