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Table of Content

    24 December 1994, Volume 14 Issue 4 Previous Issue    Next Issue
    理论研究
    THE PHYSICAL NATURE OF THE ERUPTIVE PROCESS OF HELICAL PROMINENCES
    Wu Gui-ping;Xu Ao-ao
    1994, 14 (4):  249-253.  doi: 10.11728/cjss1994.04.249
    Abstract ( 1542 )   PDF (2475KB) ( 976 )   Save
    With the Kuperus-Raadu model to describe the interaction between a prominence bud the background magnetic field, and Lundquist field to describe the distribution of current and magnetic field inside the prominence, the observational data of eruptive prominence on August 18, 1980 is systametically analysed and the physical nature in its eruptive process is discussed. The results show:(1)the physical cause of prominence to erupt is the kink-instabity of Lundquist field;(2)in the eruptive process, the magnetic energy of prominence releases fast so that the current intensity decreases continuously and prominence goes up and approaches stable state gradually;(3)the eruption of prominence may be one of the most important factorcausing CMEs.
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    LANGMUIR WAVES SPONTANEOUSLY EMITTED BY ENERGETIC ELECTRONS IN THE SOLAR WIND
    Zhou Gong-cheng;C. s. Wu
    1994, 14 (4):  254-259.  doi: 10.11728/cjss1994.04.254
    Abstract ( 1443 )   PDF (2471KB) ( 962 )   Save
    In this paper, the spontaneous emission of Langmuir waves is discuss due to energetic electrons produced by solar flares in the solar wind. It is found that the electric field of the spontaneously emitted Langmuir waves can be as large as 10-3-10-2mV/m(depending upon the distribution of the electrons),if considering a characteristic time of γkm-1, where γkm is the peak growth rate. This results is a great deal lower than the electric field associated with Langmuir waves observed with spacecraft in the solar wind. Thus, compared with induced processes,the spontaneous emission of Langmuir waves in general is negligible.
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    THE PLASMA WAKE FIELD BY SOLAR HIGHENERGY ELECTRONS IN SOLAR CORONA
    Wang Xue-yi;Huang Yong-nian
    1994, 14 (4):  260-268.  doi: 10.11728/cjss1994.04.260
    Abstract ( 1480 )   PDF (531KB) ( 907 )   Save
    In this paper we have calculated the plasma wake fields(PWFs)excited by the interaction of high-energy electron beam with cold and hot plasma, and discussed the effects of electron beam speed, density and its length on PWFs. Based on the obtained results, we have studied τ-profiles of PWFs resulted from the interactions of high energy electron beams produced during a solar impulsive flare with the cororonal plasma, and acceleration of lower energy electrons by this PWFs in the corona. Here τ=ωp(t-x/vb)where ωp =(4πnoe2/me)1/2 and t is time, x the axis along the diraction of electron beam velocity, vb the speed of electron beam, n0 plasmadensity in the corona, and me the rest mass of electron.
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    A CONTINUOUS NEUTRAL SHEET MODEL AND A NORMAL CURVE COORDINATE SYSTEM IN THE MAGNETOTAIL
    Zhu Ming;Xu Rong-lan
    1994, 14 (4):  269-276.  doi: 10.11728/cjss1994.04.269
    Abstract ( 1538 )   PDF (536KB) ( 1006 )   Save
    Amodel of the continuous equatorial-neutral sheet is developed. This model is expressed with a smooth function, whose parameters are determined by the magnetic data of the ISEE-2 satellite, and it can very smoothly connect the geomagnetic equatorial plane with the magnetotail neutral sheet changing about with the earth's tilt angle. Based on this analytic model, a normal curve coordinate system is set up, in which the neutral sheet become one of the coordinate surface. The new coordinate system will change with the earth's tilt angle and thus can almost offset the tilted effect on the pattern of geomagnetic field in the magnetotail region.
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    THE PRINCIPLE OF GENERALIZED DIGISONDE DRIFT ANALYSIS
    Guo Jian-shan;Bodo W. Reinisch;ZHENG Hong;ZHANG Qi-wei;XU Chu-fu
    1994, 14 (4):  277-285.  doi: 10.11728/cjss1994.04.277
    Abstract ( 1649 )   PDF (510KB) ( 925 )   Save
    he utility of Digisonde Drift Analysis(DDA)is demonstrated recently in the polar region ionospheric convection measurements. However, the assumption of uniform velocity in the field of view of sounder made in DDAis not always correct. Therefore a Generalized Digisonde Drift Analysis(GDDA)is introduced that is not limited to the condition of uniform velocity and thus makes it possible that the Digisonde drift measurement can be used in the complicated ionospheric motion analysis such as velocity shears, divergence and convergence. The main concept of GDDAand some promising simulation results are presented in the paper.
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    THE NONLINEAR INTERACTION OF FORCED ROSSBY WAVE PACKETS IN THE MIDDLE ATMOSPHERE Ⅱ. NUMERICAL COMPUTATION
    Xiong Jian-gang;Yi Fan;Li Jun
    1994, 14 (4):  286-292.  doi: 10.11728/cjss1994.04.286
    Abstract ( 1614 )   PDF (458KB) ( 862 )   Save
    The problem of the stability of .the forced Rossby wave packets which are nonlinearly interacted resonantly in the middle atmosphere is examined numerically. The results are in agreement with our theorical analysis. When there is only one forced wave packet with middle wavelength, the stationary state may bifurcates to another stable one. Specially, when the Rossby wave packet with middle wavelength is the only one which isn't forced, there may exist multi-stationary states. The stationary states may generate cusp catastrophe in some domain of the intensity of the forcing. The stationary state that the system can really tends to is not only relateto the way in which the intensity of the forcing varies but also depends on the initial state.
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    THE SHEATH STRUCTURE FORMED BY ELECTRON BEAM CONTINUOUS INJECTION INTO VACUUM
    Zang Zhen-qun;Fu Zhu-feng
    1994, 14 (4):  293-297.  doi: 10.11728/cjss1994.04.293
    Abstract ( 1518 )   PDF (296KB) ( 875 )   Save
    Aone-dimensional, two-stream analytical code has been developed to study the sheath structure formed by electron beam continuously injected into vacuum. Injected electrons will be decelerated and then drawn back to the surface of the spacecraft by the positive charges due to the electron beam injection into the vacuum from the spacecraft. The injection beam and return beam form two electron streams with the same density and velocity distribution in the sheath. The stagnetion point is at x=vo/(3ωo)(where vo is the initial velocity of beam injection, ωo is the plasmafrequancy of incipient injected electrons). Also, electric field distribution and electron density distribution in the sheath are given out in this paper.
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    探测与分析
    AN INVERSION ANALYSIS IN DETERMINING THE PHASE VELOCITY OF TIDs BASED ON RADIO ASTRONOMICAL OBSERVATION
    Han Wen-jun;T. A. Th. Spoelstra
    1994, 14 (4):  298-304.  doi: 10.11728/cjss1994.04.298
    Abstract ( 1413 )   PDF (300KB) ( 804 )   Save
    Considering the generation mechanisms of the atmospheric gravity waves and measurement techniques for TIDs, some useful rules for explaination of the measurements are drawn. It is shown that: TIDs consist of two harmonic waves which are orthogonal to each other, and both the measurement techniques for TIDs i.e. the total electron content measurement and the electron density measurement are equally effective. Accordingly inversion formulas for determination of the phase velocity of TIDs from radio astronomical data are derived, and the suppressing effects on wave amplitude are discussed.
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    A COMPARISON OF THE INTERNATIONAL REFERENCE IONOSPHERE(IRI-90)WITH THE ELECTRON DENSITY PROFILE OF THE IONOSPHERE OBSERVED IN CHINA
    Luo Fa-geng;Dai Kai-liang;Quan Kun-hai;Liu Rui-yuan
    1994, 14 (4):  305-311.  doi: 10.11728/cjss1994.04.305
    Abstract ( 2112 )   PDF (376KB) ( 1614 )   Save
    Asystematic comparison is made between the electron density profiles observed at four of the Chinese ionospheric stations during high solar activity periods and the International Reference ionosphere IRI-90.It is indicated that the bottomside values of IRI-90 are generally greater than measured ones. In detail, the IRI-90 predicted electron content values are more close to the measured ones in daytime than in nighttime, and more close at mid latitudes than at low latitudes.
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    THE ENERGY DEPOSITION OF A MHD SHOCK IN THE INTERPLANETARY MEDIUM
    Liu Shao-liang;Wang Zhi-xiang
    1994, 14 (4):  312-319.  doi: 10.11728/cjss1994.04.312
    Abstract ( 1800 )   PDF (467KB) ( 979 )   Save
    The relation of energy flux increment in downstream of a MHD shock relative to the upstream are deduced, and the radial evolution of the parameters of the solar wind in different flow speed is given in the form of power-law from the data observed by spacecrafts Helios A, B. Using above power-law of solar wind parameters as the upstream medium parameters of a shock, the rate of energy deposition dE/dR of the shock at different heliocentric distances for magnetic energy, internal energy. kinetic energy and the total energy are computed respectively. The result shows that across a MHD fast shock the increment of kinetic energy is the most important, next is the internal energy and the magnetic energy is the least; the rate of total energy deposition is larger near the sun, but its decreasing is faster. The total energy deposition increases with the initial shock Alfven number A10 in the range of0.3-1.0 AU, and the computed values are agreeable with the observed.
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    THE ORBITAL VARIATIONS OF BALLOON SATELLITES 1990-81B AND 1990-81C AND DETERMINATION OF AIR DENSITY
    Liu Ya-ying
    1994, 14 (4):  320-327.  doi: 10.11728/cjss1994.04.320
    Abstract ( 1682 )   PDF (377KB) ( 1066 )   Save
    The orbital variations of two balloon satellites, DQ-1A(1990-81B)and DQ-1C(1990-81C), are determined and presented in this paper. Apractical method for determining air density from the decay rate of nearly circular orbit is used and the upper atmospheric densities and variations at heights of 500-900km during the period when solar activity was just at a high level have been obtained from two balloon satellites. The results show that two sets of the density and variations determined respectively from two balloon satellites with different area/mess ratios are good agreement with each other and the variations of density with daily and 27 days periodically time scales of solar activity are very obvious. Acomparison between observed density and the COSPAR International Reference Atmosphere 1972 and 1986 is made in this paper. The analytic results are valuable for the study of space environments and the application of upper atmosphere model.
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