Table of Content

    24 January 1984, Volume 4 Issue 1 Previous Issue    Next Issue
    On the Viscous Attenuation of Alfvénic Fluctuations in the Solar Wind
    Tu Chuan-yi
    1984, 4 (1):  1-10.  doi: 10.11728/cjss1984.01.001
    Abstract ( 1353 )   PDF (625KB) ( 817 )   Save
    The possibility of the viscous attenuation of the Alfvénic fluctuation in the solar wind is discused with a viscous WKB solution of incompressible Alfvén waves, the wavelength of wich are larger than the mean free path. Because the proton gyro-frequency is much larger than the collision frequency in the solar wind, viscous attenuation should be propotional to the component of the fluctuation parallel to the average magnetic field vector. If the ratio between the amplitudes of the parallel component and the perpendicular component is a constant with respect to the heliocentric distance r, no viscous attenuation occurs for 0.3 AU < r < 1.0 AU, whereas for r<20 R, the Alfvenic fluctuation will suffer some viscous attenuation, that may accelerate the solar wind. If, however, there is not parallel component for r < 20R, the fluctuation will not suffer any viscus attenuation in the interplanetary space.
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    The Statistic Study of the Energy Coupling Coefficient Between Solar Wind and the Magnetosphere
    Fu Zhu-feng;Wang De-ju
    1984, 4 (1):  11-15.  doi: 10.11728/cjss1984.01.011
    Abstract ( 1409 )   PDF (373KB) ( 1073 )   Save
    In this paper, 18 periods of data including solar wind parameters and geomagnetic indices from 1972 to 1974 are used in regression analysis to specify the value of magnetic coupling coefficient a for the energy transfer from solar wind to the magne-tosphere. The values calculated are very different for different events with no superior band. The dispersion pattern of the results keeps for modified versions of controlling factors in regression processes. This indicates that the mechanism of energy transfer from solar wind to the magnetosphere varies from event to event. The electromagnetic coupling may be the most important among the possible coupling mechanism but not the unique.
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    "Collisionless Electron Heat Conduction" and the Polytrope Law
    Zhao Xue-pu
    1984, 4 (1):  16-21.  doi: 10.11728/cjss1984.01.016
    Abstract ( 1373 )   PDF (383KB) ( 980 )   Save
    The expression of the so called eollisionless electron heat conduction, which was proposed by Hollweg in 1976 based on the qualitative analysis, is deduced from the moment equations of the electron distribution function under the assumption of the existence of the polytrope law between the electron thermal pressure and electron density. Comparison of the expression deduced here with the Hollweg’s expression indicates that the unknown dimensionless factor in the letter is determined by the poly-trope index. The applicability of the "collisionless electron heat conduction" and the mechanism of the electron heat transport in the solar wind are discussed in detail.
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    Dimension less Jump Conditions for the Magnetohydrodynamics Shock Wave
    Wei Feng-si
    1984, 4 (1):  22-33.  doi: 10.11728/cjss1984.01.022
    Abstract ( 1479 )   PDF (656KB) ( 1164 )   Save
    The jump equations of the magnetohydrodynamics shock wave are transformed to the dimensionless form, so that their solutions become very simple and straightforward. An obligue, a perpendicular, a parallel shock wave as well as the unitized form for the aerodynamic and the magnetohydrodynamics shock wave are discussed in this paper respectively.
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    A Case Study for Imperfect Magnetosphere-Ionosphere Coupling by STARE-TRIAD Joint Observations
    Zi Min-yun;E. Nielsen
    1984, 4 (1):  34-41.  doi: 10.11728/cjss1984.01.034
    Abstract ( 1355 )   PDF (551KB) ( 545 )   Save
    A case from STARE-TRIAD simultaneous observations is used to investigate the Magnetosphere-Ionosphere imperfect coupling. The latitudinal profiles of the STARE observed E-fields, the TRIADmeasured field-aligned currents and the deduced heigh-tintegrated Pederson conductivities near the Harang discontinuity are found to be in good agreement with the theoritical model of Kan and Lee. The observations support the prediction that the U-shape electric equipotential contours at the discontinuity is accompanied by a S-shape contour equatorward, which is associated with a second enhancement of height integrated Pederson conductivity and a valley in the latitudinal profiles of the ionospheric E-fields. Other samples from the STARE observations show that the results here have some universal significance.
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    Application of Pattern Recognition Method to the Prediction of Geomagnetic Storms
    Zeng Xiao-ping;Lin Yun-fang;Lu Chen Feng;Zhong-xiao;Guo Qi-hua;Wang Bi-quan
    1984, 4 (1):  42-50.  doi: 10.11728/cjss1984.01.042
    Abstract ( 1441 )   PDF (596KB) ( 888 )   Save
    The solar and geophysical data in the period from January 1st, 1971 to January 18th, 1977 are devided into 442 intervals, each containing 5 consecutive days. The 195 intervals before September 1st, 1973 were difined as "declining phase" and the following 247 intervals as "minimum phase". Each interval can be characterized as geomagnetic disturbed "D" or calm "N" according to the. beginning of geomagnetic storm.On the other hand, we try to define by computer the disturbed days on the base of solar or geophysical features in association with the geomagnetic storms in the first two third of number of intervals (refered to as "learning period") in both declining and minimum phase in order to determine certain threshold values necessary for this method. Then we use this method to identify the "D" and "N" intervals in the remaining one third of number of intervals (refered to as "test period").The main results as follows:(1) In the declining phase the comprehensive flare index (CFI) of importance equal 6 or more, the radio bursts of Type IVwith duration 10 min, or more and the interplanetary magnetic field (IMP) sector boundary passage through Earth are most likely associated with geomagnetic storm.(2)In the minimum phase the solar active source exhibiting 27-day reoccurring tendency (i.e.. the high speed stream from the coronal hole) and the IMFsector boundary passage through Earth are most likely the cause of geomagnetic disturbances.(3)The recognition efficiency is 73-82% in the learning period and 73-80% in the test period with error < 30% in both eases.We also have made experiments of orthogonal design with a member of groups of threshold values and test of significance. The resulting confidence limit in this method is greater than 97.5%.
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    Human Reactions to Three Stage Launching Acceleration
    Xie Bao-sheng;Liu Guang-yuan;Cheng Xue-yao;Xue Yue-ying
    1984, 4 (1):  51-57.  doi: 10.11728/cjss1984.01.051
    Abstract ( 1413 )   PDF (518KB) ( 890 )   Save
    Three or two stage acceleration profiles are often encountered by astronauts during launching of space vehicles. In order to study the effects of this type of acceleration on human body, ten healthy young subjects were exposed to a three stage acceleration profile on a human centrifuge with a back angle of 15. The three stages lasted 150 seconds each, with successive peak of 4.6 and 5Grespectively.Electrocardiogram, blood pressure vibro-cardiogram, rheoencephalogram and respiration were recorded. Analysis and discussion of change of some important physio-logical parameters were made. Results showed that subjective feelings of the subjects were fairly good. Changes of the physiological parameters were within the range of a compensatory requlation. All subjects tolerated this profile of acceleration successively.
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    Electric Properties in the Near Earth Region
    Zhuang Hong-chun
    1984, 4 (1):  58-71.  doi: 10.11728/cjss1984.01.058
    Abstract ( 1401 )   PDF (1016KB) ( 993 )   Save
    The coupling through electric processes is one of the mechamisms of solar coupling influence on meteorology. Acritical review is given on the observations of electric currents and fields in the near Earth region and on the empirical and theoretical models based on the observations. Abrief picture of the electric properties is therefore outlined in the near Earth region both in average and solar active conditions. Highlight is in the lower and middle atmosphere near the surface of the Earth and especially on atmospheric electric properties and their modulation by solar activities.
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    Three Gamma-ray Sources With Large Angular Sizes
    Li Ti-pei
    1984, 4 (1):  72-75.  doi: 10.11728/cjss1984.01.072
    Abstract ( 1491 )   PDF (270KB) ( 839 )   Save
    Based on an analysis of the data from the gamma-ray astronomy satellite COS-Band the radio-astronomy measurements for CO molecules, it appears that the three cosmic gamma-ray sourcer, 2CG 036+01, 2CG 218-00 and 2CG 235-01, should possibly be isolated giant molecular clouds or combinations of some molecular clouds which are aligned within the angular resolution of detector.
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    Mean Density Scale Heights From Analysis of Variation in Perigee Height of China Second Satellite
    Feng Zan-liang
    1984, 4 (1):  76-81.  doi: 10.11728/cjss1984.01.076
    Abstract ( 1465 )   PDF (357KB) ( 901 )   Save
    In this paper a method for computing density scale height His discussed. At the same time, from the analysis of variation in perigee height of the China second satellite, four mean values of density scale height Hare determined. The difference between determined values and CIRA-1972 are within 10%, and mean Hare 5% higher than that given by CIEA-1972.
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    The Processing of the Data Obtained by Starmapper and Further Use
    Pei Yun-tian
    1984, 4 (1):  82-87.  doi: 10.11728/cjss1984.01.082
    Abstract ( 1281 )   PDF (361KB) ( 616 )   Save
    The processing of the starmapper data is briefly described in this paper. The further use of the data obtained is studied as well.When the direction of the satellite is unidentified, this paper gives a method identifying the scanned star and the direction of the satellite from the data obtained by the starmapper.
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