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英国《中国天文学和天体物理学》(SCI收录)全文摘译期刊之一
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Chinese Journal of Space Science
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24 January 1986, Volume 6 Issue 1
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Reexamination of the Viscous Effect in the Solar Wind
Zhao Xuepu;T. E. Holzer
1986, 6 (
1
): 18. doi:
10.11728/cjss1986.01.001
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1399
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The Helios observations of the plasma and magnetic field in the highspeed solar wind streams between 1 AU and 0.3 AU are used to examine the radial distribution of the various forces exerted on the streams. It is shown that the classical expression of the viscosity derived in the condition of collisiondominated plasma is not suitable to be used to describe the viscous effect in the high speed wind streams, and the viscous force appears to exist in order to balance the inertial force of the fluid element with the resulting force, which approximates to the solar gravity in value between 0.3 AU and 1 AU. The radial dependence of the real viscous force in the streams is deduced in the present work and the corresponding viscosity is derived by assuming the trend of the real viscosity approaching to the classical viscosity as the helicentric distance decreasing. It is found that the ratio of the real viscosity to the classical one at 1 AU would be equal to or greater than one tenth.
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The Dawndusk Asymmetry of the Dayside Convection Reversal Location on High Geomagnetic Disturbed Days (Combination of Stare, Triad and AEC)
Zi Minyun;E. Nielsen;W. B. Hanson;T. A. Potemra
1986, 6 (
1
): 918. doi:
10.11728/cjss1986.01.009
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1520
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A combination of convection velocity data from the STARE radar and Atmosphere Explorer C and Fieldaligned current data from TRIAD are examined tinder high geomagnetic activity conditions. It is found that the dawnside convection reversal and the boundary of the two fieldaligned currents are located at lower invariant latitudes than are the duskside ones. The asymmetry at ionospheric altitudes demonstrates that some kinds of asymmetry in transfer processes of mass, momentum and energy of solar wind particles are also developed in dayside magnetosphere under high magnetic activity condition. It is suggested that this asymmetry derives from the "Garden Hose" angle of the interplanetary magnetic field. It seems that the dawndusk asymmetry of the shock structures in Earth's bow shock is related to the phenomena discussed here. Other possibilities are also discussed.
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Filamentation Instability of Whistler Wave in the Magnetosphere
Wang Yuandian
1986, 6 (
1
): 1923. doi:
10.11728/cjss1986.01.019
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1361
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The filainentation instability of whistler waves in the magnetosphere is analyzed in this paper, and the growth nate is calculated. For propagation path L = 4 and electric field of the wave 1 mV/m, the maximum growth rate is about 0.13/1000 km, the corresponding perpendicular wave length is about 400 km (near the equator region). It is also pointed out that the filaxnentation instability discussed here may offer a nonlinear mechanism for the multipath propagation of whistlers.
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Numerical Examination of Akasofu's Energy Coupling Function
Xu Wenyao;Shi Enqi
1986, 6 (
1
): 2432. doi:
10.11728/cjss1986.01.024
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1446
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Based on the general formula of the energy transfer rate from the solar wind into the magnetosphere, the coupling mechanism of MHD flow is examined by using solar wind data for a period, of 34 days. It is shown that MHD flow mechanism is valid when B
_{z}
<0 (or IMF is southward). In this case the energy transfer rate can be expressed by P =CBT
^{2/3}
V
^{5/3}
n
^{1/3}
sin
^{4}
((3/2). This is dfferent from Akasofu's coupling function, but in good agreement with Murayama & Hakamada, Svalgaard, Murayama, and Holzer & Slavin. The factors influencing the calculations of coupling function are also discussed.
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Selfexcitation Effect of Scattering of Electromagnetic Radiation in a Strong Magnetic Field
Liu Zuwei
1986, 6 (
1
): 3342. doi:
10.11728/cjss1986.01.033
Abstract
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1378
)
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In light of the solution of electron motion equation in a magnetic field, the electron scattering in response to the incident electromagnetic wave of frequency wi includes the part whose frequency is the same as the cyclotron one besides that of frequency wi. This effect can be called the selfexcitation and, except the highfrequency limit, has a considerable influence upon the cross section. In this paper, the modified cross sections of classical nonrelativistic electron in the case of both a single electron and cold plasma are. given. The spectrum distribution of electron scattering is discussed, and the Thomson absorption coefficients of magnetized thermal equilibrium plasma are obtained for some typical cases. It is also pointed out that the result here can be applied for many astrophysical aspects such as the spectrum formation of Xray pulsars.
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Ray Direction in a Warm Electron Magnetized Plasma
Wang Zhensong
1986, 6 (
1
): 4351. doi:
10.11728/cjss1986.01.043
Abstract
(
1396
)
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The directions of the groupvelocity vectors of waves of various frequencies in a warmelectrons only plasma are given. Some important properties of the direction of groupvelocity vectors are revealed. It is shown in particular that there is a plasma wave propagating near the resonant region of the wave in the corresponding cold plasma. The electron plasma wave can link with the ordinary wave or the extraordinary waves. This makes waves capable of propagating in a broader range of angles than in a corresponding cold plasma.
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Relationship Between Solar Activities and Thunderstorm Activities in Beijing Area and Northeast Region
Zhuang Hongchun;Lu Xicong
1986, 6 (
1
): 5259. doi:
10.11728/cjss1986.01.052
Abstract
(
1503
)
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Solar activities may influence atmospheric electric properties, Atmospheric electric properties may play a critical role in the formation of thunderstorm. The effects of solar activities on atmospheric electricity may at last .influence the formation of 'thunderstorm. The analysis of the relationship between IMF section boundary crossing, solar flare, sun spot eleven year cycle variation and thunderstorm index is given using superposition epoch merthod for more than 13000 thunderstorm data from 10 meterology stations in Beijing area and Northeast region during 1957 to 1978. The results show that for some year's there exists correlationship between thunderstorm index and positive IMF sectiofn boundary crossing. The thunderstom index increases obviously within three days near crossing and on the seventh day after the crossing. The influence of the crossing on thunderstorm is stronger in the former half year than the latter half year. For different classes of solar flares, the influenced are not equally obvious The solar flares appeared on the weat side, especially in westen region, one (from0° to 30°) have most obvious influence. There is no discernible correlationship between thunderstorm index and sun spot eleven year cycle.
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Types and Characteristics of the Extraterrestrial Magnetic Spheres in the Ocean Bottom
Wang Xianlan;Liang Jingzhou
1986, 6 (
1
): 6066. doi:
10.11728/cjss1986.01.060
Abstract
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1466
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In this paper, over one hundred and forty magnetic spheres samples obtained in different ways were tested and studied systematically, and one hundred and twelve spheres were divided into three types of origin (cosmic, terrestrial, and of industrial pollution), four, types of genesis (melt, nonmelt, volcanic explosion, and metalspark), and fourteen groups of shapestructure type. Our discussion will centre on the characteristics and signifieance of the magnetic spheres from the universe.
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Dynamical Theory of Multifunction Drytuned Accelerometer/gyro
Wang Huinan
1986, 6 (
1
): 6775. doi:
10.11728/cjss1986.01.067
Abstract
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1361
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In constrast to symmetric rotor of Drytuned GYRO (DTG), the rotor of Drytuned accelerometer/GYRO (D'TAG) has different transverse moments of inertia and a proper rotor pendulosity. DTG can be improved to DATG. This instrument provides measurements of angular rate about two axes and linear accelerations along two axes. The study of DTAG is a significant effect on the development of Inertia Navegation System.This paper presents the dynamical equations of DTAG. Under the condition of multifrequency vibration, the stationary solution is computed according to the analyses of the dynamics. The feasibility of drytuned sensor technology for mechanizing an inertia grade fouraxes multifunction senson is demonstrated.This paper also presents the condition of eliminating error torques resulting from angular vibration inputs of double spin frequency of the driving shaft. This condition is obtained by way of simple construction of single gimbal GYRO.
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Three Dimensional Propagation Characteristics of the FlareAssociated Interplanetary Shock Wave During 19781981
Wei Fengsi
1986, 6 (
1
): 7681. doi:
10.11728/cjss1986.01.076
Abstract
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1497
)
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The threedimensional propagation characteristics of the iflareassociated shock wave are studied from Japanese IPS data of 85 flares (importance > 2) events during the period of highsolar activity years of 19781981. In this paper, the influnences of the dynamical effects of shock wave propagation on. the IPS data are considered. The results show that: (1) the propagation of the shock wave is asymmetrical relative to the normal direction of the flare. With regard to longitude, the fastest direction tends to that of the interplanetary magnetic field, and with regard to latitude it tends to that of the average position of the heliospherical current sheet during the period of 85 flare events; (2) propagating range of the latitudes (  60°+40°) is less than that of the longitudes(>±90); (3) there are more marked eastwest and southnorth asymmetries in the distribution of the shock wave energy, which determine the anisotropies of the shock wave propagation. The average energy is about 2.7×10
^{31}
ergs/ster for the studied 85 flareIPS shock wave events.These results are Wassieally consistent with that obtained by analysing American IBS data
^{[3]}
, and also coincident with that of the spacecraft observations tod the indirect results of inverstigations 78. So it is reasonable to think that the magnetic structures near the sun and the interplanetary largescale solar wind structures would exert significant modulating effects on the threedimensional propagation of the shock wave.
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Qn the Stress Analysis and the Shape Design of the Scientific Balloon at High Altitude
Huang Wuliang;Xu Chunxian;Wu Mei;Gu Yidong;Xu Zongxing
1986, 6 (
1
): 8288. doi:
10.11728/cjss1986.01.082
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1655
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An analysis of the stress of the zero pressure balloon membrance with rotational symmetry is presented, and the reasonable shapes can be designed by choosing rational restrain conditions of the latitude stress t. We propose the following three principles for σ
_{t}
: (1) in the lower hemilballoon,σ
_{t}
≈0;(2) then, σ
_{t}
gradually increases from the middle to the top of the balloon; (3) near the top, the longitude stress σ
_{t}
≈0.According to these principles, one can design balloons with or without reinforce tapes, both have the maximum stress and the total stress energy much less than that in ordinary designs with σ
_{t}
=0. So., such types wiljl be adopted in the design of giant ballootn.
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