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Table of Content

    24 August 2000, Volume 20 Issue 3 Previous Issue    Next Issue
    论文
    SIGNIFICANCE OF NEW STELLAR LIMB DARKENING LINEAR EMPIRICAL LAWS
    ZHAO Dingfeng;HANG Hengrong
    2000, 20 (3):  193-200.  doi: 10.11728/cjss2000.03.193
    Abstract ( 1413 )   PDF (522KB) ( 900 )   Save
    One of the reasons that the new stellar limb darkening linear empirical law ismore accurate can be explained from aspect of geometry. The LTE generalizationof the new law agrees to the observation results of the Sun and the Antares well.The condition under which two limb darkening zero order approximations(UD andFDD) could be applied is summarized in the paper.
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    A COMPARISON BETWEEN AN ION-CYCLOTRON RESONANCE MODEL FOR HEATING ANDACCELERATION OF THE SOLAR WIND AND THE OBSERVATIONS ON THE SOLAR POLARCORONA HOLE BY UVCS ON SOHO
    SU Chuanzheng;WANG Linghua;TU Chuanyi
    2000, 20 (3):  201-207.  doi: 10.11728/cjss2000.03.201
    Abstract ( 1873 )   PDF (541KB) ( 661 )   Save
    A set of equations are developed for describing the spatial evolution in the polarcorona of anisotropic multi-ion-nuid properties based on the heating and acceleration by ion-cyclotron resonance. Numerical solutions of this equation set are usedto make a comparison with the recent observations by UVCS on SOHO(Kohl etal. 1998). If we assume that the spectrum of the cyclotron waves has a fixed slop, -2, themodel results can describe the UVCS observations for Helium(assuming for protons also)and for either the bulk speed of O+5 ions or the effective perpendicular thermal speed ofO+5 ions respectively if further assuming different amplitude of the waves. However we cannot describe both speeds with single wave amplitude. It is suggested that the fixed spectrumslope assumption, which is widely used in the study of this topic, may not describe the realsituation in corona.
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    APPLICATIONS OF A NON-OSCILLATORY, NON-FREE PARAMETER SCHEME IN THREEDIMENSIONAL SOLAR WIND FLOW SIMULATIONS
    YE Zhanyin;WEI Fengsi;FENG Xueshang
    2000, 20 (3):  208-215.  doi: 10.11728/cjss2000.03.208
    Abstract ( 1629 )   PDF (381KB) ( 893 )   Save
    Non-oscillatory, non-free parameter scheme is employed to split three-dimensional,time-dependent hydrodynamic model for numerical computation. Computations ofbackground fluid field and disturbance propagation are carried out for the coronalmass ejection occurring in May 1998. A similar density distribution to that of radial magnetic on solar source surface can be determined from the HAO K-coronameter polarization-brightness data, which can be taken as inner boundary densitydistribution. The propagation of disturbance shows a sharp discontinuity withoutspurious oscillation and dispersion. Also, the numerical test shows that the schemekeeps a stable iteration without any artificial diffusion being added. On the otherhand, the source code programmed with this hydrodynamic model can be used tomodel the specific coronal mass ejection when the configuration of magnetic field isnot decisive the solar wind flow.
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    THE EFFECT OF PLASMA SHEET FAST FLOWS ON SUBSTORMS
    SHEN Chao;LIU Zengxing;CAO Jinbin;ZHANG Xiaoxin;WANG Xueyi
    2000, 20 (3):  216-223.  doi: 10.11728/cjss2000.03.216
    Abstract ( 1794 )   PDF (516KB) ( 1222 )   Save
    In this investigation, using a two-dimensional particle code, we have exploredthe influence of the fast flows in plasma sheet on the triggering of substorms. Wehave found that, the local speedy flows in plasma sheet could trigger the magneticreconnection process and cause the fast release of magnetic energy stored in mag-netotail. However, continuing, stable and homogeneous fast convections in plasmasheet may depress the magnetic reconnection processes in magnetotail. The resultsobtained in this study indicate that the local Bursty Bulk Flows(BBFs) can lead tothe onsets of magnetospheric substorms; nevertheless, when the IMF keeps south-ward for a long time, there may be no substorm onset, which has been called SteadyMagnetospheric Convection processes.
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    THE CHARACTERISTICS AND RELATIONSHIPS OF EQUATORIAL AND MID-LATITUDESPREAD-F
    ZHANG Tianhua;XIAO Zuo
    2000, 20 (3):  224-232.  doi: 10.11728/cjss2000.03.224
    Abstract ( 1616 )   PDF (602KB) ( 848 )   Save
    By numerical simulations the characteristics of the mechanism of equatorial andmid-latitude Spread-F and relations between them are studied. It is found that indifferent latitudes, the same mechanism can evolve into quite different structuresas the background ionosphere is different. Then a theory to explain the discordof disturbance phases in bottomside and topside ionosphere, because it is believedthat through some combinations of ionospheric parameters, bubbles can generatein topside first without much disturbance of the bottomside ionosphere. And bynumerical simulation. A model of radio-wave scattering is put forward to explainthe higher occurrence rate of the blur of radio waves in mid-latitudes than what isexpected by linear theory.
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    VHF RADAR OBSERVATION OF THE SEMIDIURNAL TIDE IN THE SUMMER POLAR MESOSPHERE
    LIU Renqiang;YI Fan
    2000, 20 (3):  233-241.  doi: 10.11728/cjss2000.03.233
    Abstract ( 1625 )   PDF (615KB) ( 895 )   Save
    Data obtained from the mobile SOUSY VHF radar at Andthya/Norway(69°N,16°E) during the MAC/SINE campaign in summer 1987 have been used to studythe structure characteristics and variability of the semidiurnal tide in the polarmesosphere. It is shown that the spectral peak corresponding to the semidiurnaltide dominates and persists almost uninterruptedly in time. The correspondingfrequency often deviates from 1/12 c.h-1. This likely represents a temporary or disturbed state. The amplitude of the stable semidiurnal tide increases rapidly withheight and shows a saturation behavior at the height of about 87.9 km. The phasefront of the tide moves downward, indicating the associated energy flux transportsupward. The phase of the meridional component often leads that of the zonal component about T/4-π/2(equivalent to 1.5-3 h), resulting in a clockwise hodographof the wind vector with respect to time. The values of wave-associated parametersare obtained by a harmonic analysis in which the variable frequency correspondingto spectral peak is traced. By and large, the time variation trends of the tide inthe zonal and meridional components are similar, but display an anisotropy to someextent.
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    NUMERICAL CALCULATION OF POINT EFFECTS OF ELECTRIC FIELD NEAR THESURFACE OF A SATELLITE
    ZHUANG Hongchun;CHEN Tianchen;HUANG Jianguo
    2000, 20 (3):  242-250.  doi: 10.11728/cjss2000.03.242
    Abstract ( 1498 )   PDF (441KB) ( 1311 )   Save
    Taking advantage of charge simulation method and potential coefficient methodfor ellipsoids, point effects of electric field near the surface of a satellite are calculated nummerically. Antenna point effects on a high voltage spherical satellite arecalculated as an example.
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    A SOLAR PROTON EVENTS MORNITORING-WARNING SYSTEM ON BOARD FY-2 AND ANATTEMPT OF PROTON EVENTS WARING
    LIN Huaan;ZHU Guangwu;WANG Shijin
    2000, 20 (3):  251-256.  doi: 10.11728/cjss2000.03.251
    Abstract ( 1766 )   PDF (416KB) ( 1051 )   Save
    Solar proton events monitoring and warning system which consists of space highenergy particles monitor and solar x-ray detector are introduced in this paper. Thesystem are boarded on a FY-2 geosynchronous meteorological satellite launched in10 June 1997. The first test for solar proton events according to the properties ofsolar fiare xray emission occurring in 1997-11-04 and 1997-11-06, are introduced,too. Some relevant observational data obtained with FY-2 satellite.
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    AN EXPERIMENT RESEARCH ON TECHNIQUE OF ATTITUDE DETERMINATION WITH DOUBLE SATELLITES
    ZHENG Wei;WU Jie;HU Xiaoping;ZHAO Jiankang
    2000, 20 (3):  257-261.  doi: 10.11728/cjss2000.03.257
    Abstract ( 1589 )   PDF (280KB) ( 1408 )   Save
    The method of attitude determination with double satellites is discussed indetail in the paper, and the actual experiment of attitude determination with onlytwo GPS satellites is conducted. The long-short baseline method and sequenceoptindzation method are synthetically used to estimate carrier phase ambiguity.The experiment results indicate that the success rate of attitude deterndnationexceeds 90% and the mean square error of attitude can be less than 0.5°, whenbaseline length be 1 m around.
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    STUDY ON HEAT RESISTANCE OF MODIFIED Ti-Cr-Si SILICIDE COATINGS ON C-103NIOBIUM ALLOYS
    WANG Yu;CHEN Min;GAO Jiaping;HU Xingfang
    2000, 20 (3):  262-270.  doi: 10.11728/cjss2000.03.262
    Abstract ( 1463 )   PDF (853KB) ( 744 )   Save
    The modified Ti-Cr-Si silicide protective coatings on C-103 niobium alloys wereprepared by slurry-firing method. The chemical composition, microstructure, andproperties of the modified Ti-Cr-Si coatings were studied by means of optical microscope, energy dispersive X-ray diffractometer, RAX-10 diffractometer, EPMA-8705QH2 etc. The experimental results showed that the oxidation-resistance of themodified Ti-Cr-Si coating at high temperature can be increased using appropriateadditives and substratum pretreating method.
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    STUDY ON ATTITUDE DYNAMICS OF A LIQUID-FILLED SPACECRAFT WITH ELASTIC APPENDAGES
    CHENG Xuduo;WANG Zhaolin;LI Junfeng
    2000, 20 (3):  271-277.  doi: 10.11728/cjss2000.03.271
    Abstract ( 1344 )   PDF (428KB) ( 1292 )   Save
    In this paper attitude dynamics of liquid-filled spacecraft with elastic appendagesis studied- Motional equations of liquid, motional equations of system and motionalequations of particle of elaJstic plates are obtained by using the theorem of angu-lar momentum, the conservation law of angular momentum and Newton's motionallaw. When elastic plates deploy at uniform velocity of plates motional equationsof plates are alternated. Using Runge-Kutta method, the plate's amplitudes ofvibration are obtained. Using motional equations of system,the attitude angularvelocities of spacecraft are obtained.
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    “SIMILAR CYCLE”METHOD AND A DISCUSSION OF PREDICTED MONTHLY SUNSPOT NUMBERS FOR SOLAR CYCLE 23
    WANG Jialong;HAN Yanben
    2000, 20 (3):  278-281.  doi: 10.11728/cjss2000.03.278
    Abstract ( 1654 )   PDF (263KB) ( 808 )   Save
    A conception of "Similar Cycle" and its application to predictions of monthlymean and smoothed monthly mean sunspot numbers are introduced in this paper.A test of the method for cycles 20 and 21 and a comparison of the observations withthe predicted monthly sunspot numbers of the first part of cycle 23 shows that themethod is in practice.
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    RESEARCH OF LAUNCHING WINDOW OF SATELLITE CONSTELLATION
    XU Min;CHENG Fengzhou;CHEN Shilu
    2000, 20 (3):  282-288.  doi: 10.11728/cjss2000.03.282
    Abstract ( 1920 )   PDF (470KB) ( 927 )   Save
    Launching plan of satellite constellation is a problem to decide proper time thatlaunch satellites on the ground into demanded orbit place. Under request satisfiedphase among satellites and launching a satellite restricted conditions, launchingwindow is discussed for the Wallker-12 satellite constellation at 800km highnessand an inclined orbit at 45°. The results may be of reference value to researchlaunching satellite constellation.
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