Loading...
中文核心期刊
CNKI期刊全文数据库
中国科学引文数据库(CSCD)源期刊
中国科技论文统计源期刊
万方数据知识服务平台
英国《科学文摘》(SA)
美国化学文摘(CA)
俄罗斯《文摘杂志》(AJ)
德国《天文学与天体物理学文摘》(AAA)
英国《中国天文学和天体物理学》(SCI收录)全文摘译期刊之一
《中国学术期刊文摘》
《中国物理文摘》
《中国天文学文摘》

Table of Content

    24 December 1995, Volume 15 Issue 4 Previous Issue    Next Issue
    论文
    RADIAL EXPANSION OF A SYMMETRICAL CME BETWEEN TWO CORONAL STREAMERS
    Zhang Gong-liang
    1995, 15 (4):  253-262.  doi: 10.11728/cjss1995.04.253
    Abstract ( 1382 )   PDF (2863KB) ( 1306 )   Save
    The CME event on May 6,1980,occurring between a pair of coronal streamers,is discussed in this paper.An empirical kinematical model is proposed for describing the motion of outer loop of the event,n which the observed profile of loop is fitted in terms of the Cassini function in a moving coordinate system.The development of the loop can be distinguished into two different phases.During the first phase,when the loop lay between the helmet structures of streamer pair,the development of event is dominated by expansion of angular width with the asymmetrical axis shifting to northern latitudes;the speed of radial expansion and outward motion were rather low with remarkable acceleration.During the second phase,when the outer loop moved beyond the height of helmet structure of coronal streamer,the angular expansion ceased;the motion approached to an expansion and lift mainly in the radial direction with uniform speed and invariable angular width.As the loop moved outward,both the top and center heights increased with time, however,the bottom remained nearly fixed.Based on the above observational characteristics,a possible mechanism is put forward for the formation of the event.
    Related Articles | Metrics
    THE COOLING EFFECT OF THE ENERGY TRANSPORT OF ALFVEN WAVE TO THE SUNSPOT
    Ni Xiang-bin;Hu Ju;Zhou Shu-rong
    1995, 15 (4):  263-265.  doi: 10.11728/cjss1995.04.263
    Abstract ( 1592 )   PDF (174KB) ( 892 )   Save
    It is suggested in this that: there is a generation of vigorous hydromagnetic waves when the magnetic field is disturbed by the fluid field of the sunspot.In the processes,the thermal energy converted into wave energy of hydromagnetic waves which rapidly propagate out of the sunspot region with Alfven speed along the magnetic field,hence resulting in cooling of the sunspot.It is very effective to keep observed temperature of the sunspot umbra at surface of the photosphere when the component of disturbed velosity normal the magnetic field is only 0.4 km/s.
    Related Articles | Metrics
    COLLISION OF MHD OBLIQUE SHOCKS
    Xun Xiao-dong;Hu You-qiu
    1995, 15 (4):  266-272.  doi: 10.11728/cjss1995.04.266
    Abstract ( 1547 )   PDF (511KB) ( 648 )   Save
    This paper discusses the collision of fast and slow MHDshocks as well as the interaction between fast or slow shocks and contact surfaces.The main conclusions are as follows.(l) Two fast shocks exchange their places after collision and a contact surface and a pair of slow rarefaction waves occur at the same time.(2)Two slow shocks exchange their places and are both weakened after collision,and a contact surface and a pair of fast shocks occur at the same time.(3)Aforward fast shock and a reverse slow shock exchange their places after collision.The fast shock increases and the slow shock decreases in strength, and a reverse fast shock,a negative contact surface and a forward fast rarefaction wave are formed.(4)Aforward fast shock and a positive(negative)contact surface exchange their places after interaction.Meanwhile, the fast shock diminishes, and a reverse fast rarefaction wave(shock),a reverse slow wave and a forward slow shock are produced.The reverse slow wave is either a shock for small(large)shock angles or a rarefaction wave otherwise.(5)Aforward slow shock and a positive(negative)contact surface exchange their places after interaction. Meanwhile, the slow shock diminishes, and a reverse slow rarefaction wave(shock)and a pair of fast rarefaction waves (shocks)are produced.
    Related Articles | Metrics
    THE OBSERVATIONS ON THE IONOSPHERIC HALL CONDUCTIVITY IN AURORAL ZONE AND ITS BEHAVIOUR UNDER E REGION ELECTRON HEATING
    Luo Yi;Chen Pei-ren;K. Schlegel
    1995, 15 (4):  273-279.  doi: 10.11728/cjss1995.04.273
    Abstract ( 1586 )   PDF (545KB) ( 966 )   Save
    The data from the EISCAT radar and corresponding ground-based geomagnetic observations are used for deriving the ionospheric Hall conductivity.There are two calculating methods employed,one is the direct estimate from ionospheric parameters,the other is indirect estimate from ground geomagnetic field.The results show that when there appears the electrons heated by the Eregion plasma unstable waves,the Hall conductivity increases conspicuously.
    Related Articles | Metrics
    PRELIMINARY ANALYSIS OF TWO-PHASE CIRCULATION IN A CAPILLARY PUMPED LOOP
    Wang Jin-liang;Ma Tong-ze;Zhang Zheng-fan
    1995, 15 (4):  280-286.  doi: 10.11728/cjss1995.04.280
    Abstract ( 1503 )   PDF (2577KB) ( 1021 )   Save
    The steady two-phase circulation in a capillary pumped loop(CPL)under microgravity or non-gravity conditions is analyzed preliminarily in this paper.Based on force balance,one-dimensional mathematical description about two-phase fluid flow in CPLis provided.Two practical examples are calculated,and some useful conclusions are obtained,including the optimal effective capillary radius,its calculational method and change tendency with working temperature etc.
    Related Articles | Metrics
    OBSERVATIONS OF THE RAPIDLY COMPONENTS AND CHARACTERISTICS OF THE BASIC COMPONENTS OF THE SOLAR RADIO EMISSION
    Ji Shu-chen;Cao Wen-da;Chen Guo-qiang
    1995, 15 (4):  287-294.  doi: 10.11728/cjss1995.04.287
    Abstract ( 1418 )   PDF (490KB) ( 883 )   Save
    Sixty rapid events observed with Corona-Radiospectrometer at Yunnan Observatory during solar cycle 22 are analysed in this paper.Five types of rapidly varying component are observed.They are spike emission,enhanced noise,rapid fluc tuation,spike-like and superimposed impulse.Some characteristic parameters of these events such as brightness temperature,superimposed character,characteristic time,emission source size,polarization are investigated and radiation mechanism,the characteristic parameters of radio burst,slowly varying components and quiet sun are studied as well.Based on the study,certain features of basic components are confirmed.
    Related Articles | Metrics
    STATISTICAL STUDY OF CSOMIC RAY MODULATION PRODUCED BY INTERPLANETARY STRONG MAGNETIC FIELD DISTURBANCE
    Guo Wei-ji;Zhang Gong-liang
    1995, 15 (4):  295-300.  doi: 10.11728/cjss1995.04.295
    Abstract ( 1571 )   PDF (352KB) ( 752 )   Save
    Three categories of interplanetary disturbances have been chosen from the period 1978--1982 when solar activity was high. They are:(i)shock wave;(ii)strong magnetic field disturbance;(iii)strong magnetic field disturbance behind shock wave. The cosmic ray variations produced by them have been studied statistically.The following results are obtained:(1)cosmic ray decrease resulted from the strong magnetic field disturbance is very obvious when there is a shock wave before it,but the cosmic ray decrease is relatively small when only shock wave or strong magnetic disturbance exists;(2)the shock wave which indicates the speed discontinuity is a vital factor resulting the Forbush decrease;(3)the speed discontinuity may take a role of trigger in the process of the cosmic ray modulation produced by the strong magnetic field disturbance.
    Related Articles | Metrics
    A STATISTICAL STUDY FOR THE SPACIAL-TEMPORAL SCALE OF IONOSPHERIC DISTURBANCES IN MIDDLE CHINA
    Wan Wei-xing;Yuan Hong;Ning Bai-qi;Li Jun
    1995, 15 (4):  301-306.  doi: 10.11728/cjss1995.04.301
    Abstract ( 1395 )   PDF (376KB) ( 853 )   Save
    In this paper the dynamic cross spectral analysis with maximum entropy method is used to yield the spacial-temporal scale and the propagation direction of the ionospheric disturbances from the data of a Doppler array.The obtained parameters of the disturbances are statistically studied,and the results reveal two types of ionospheric disturbances:one is the southward propagated wave which has the large scale on both spacial and temporal domain,the other is the north-eastward wave which has the relatively smaller scale.The sources of the southward waves are related to the polar activeties,and those of the northeastward waves may be located in the easten Qinhai-Tibet Plateau with abruptly swollen topography.The paper concluded that the global and the local properties of the ionospheric disturbances have some thing to do with the polar source and the local source respectively.
    Related Articles | Metrics
    SOME SCIENTIFIC SUBJECTS IN THE STUDY OF A SOLAR RADIOSPECTROGRAPH WITH BANDWIDTHS FROM 0.5 GHz TO 1.5 GHz
    Xia Zhi-guo;Chen Jing-ying;Fu Qi-jun
    1995, 15 (4):  307-313.  doi: 10.11728/cjss1995.04.307
    Abstract ( 1478 )   PDF (490KB) ( 837 )   Save
    In this paper, scientific objects and a technical scheme of a radiospectrograph with bandwidths from 0.5 GHz to 1.5 GHz are introduced.The main scientific objects are:(1) research on the positions of the acceleration regions;(2)research on the oscillations of the magnetic tubes with small scales;(3)multiwaveband research on the correlations between the fine structures of radio bursts and the HXRevents.Some technical requirements and technological scheme such as system of antenna,feeder,reciever and spectral analyser are also given.
    Related Articles | Metrics
    WALKER CONSTELLATIONS FOR REDUNDANT ZONAL COVERAGE
    Yuan Fu-yin;Lu Zhen-lin
    1995, 15 (4):  314-319.  doi: 10.11728/cjss1995.04.314
    Abstract ( 2005 )   PDF (467KB) ( 896 )   Save
    Anew method is introduced for optimizing satellite constellations.By which,the best satellite constellations for zonal coverage are derived.And application example is also presented in the paper.
    Related Articles | Metrics
    A TRANSIENT SIMULATION RESEARCH FOR THE CHARGING OF SPACECRAFT IN THE WORST CHARGING CASE
    Gao Shan;Gu Shi-fen
    1995, 15 (4):  320-325.  doi: 10.11728/cjss1995.04.320
    Abstract ( 1505 )   PDF (342KB) ( 1104 )   Save
    In this paper,a set of differential equations for the transient charging of spacecraft is deduced by the equivalent circuit model,then,the computer program under the worst charging conditions is made.With this program,the charging of ATS-6 is calculated in the two conditions respectively.Finally,the effects of different materials of spacecrafts on charging and discharging are discussed.
    Related Articles | Metrics
    SOLAR ACTIVITY,SEA TEMPERATURE IN THE KUROSHIO REGION AND THE FLOOD AND DROUGHT IN THE MIDDLE REACH OF THE YANGTZE RIVER
    Ruan Xue-qin;Ma Fu-hui
    1995, 15 (4):  326-332.  doi: 10.11728/cjss1995.04.326
    Abstract ( 1943 )   PDF (561KB) ( 12163 )   Save
    The relationship among solar activity,the sea temperature in the Kuroshio region and the flood and drought in the Middle Reach of the Yangtze River (MRYR)is investigated by using 30 years'data of solar activity,the sea temperature in the Kuroshio region and the rainfall in the MRYR. Results show that the rainfall in the MRYRis obviously controlled by the interannual and seasonal variations of solar activity and the sea temperature in the Kuroshio region.The solar 10.7cm radiation flux is taken as the index of solar activity and the interannual fluctuation curve of the difference of F10.7 between winter and summer oscillates with a period of about 11 years.The flood years(or drought years)frequently occurred when the positive part (or negative part and odd point) of the curve appeared 3 years ago and the last year lay in the peak (or valley,or near zero point)of the seasonal variation curve of the sea temperature in the Kuroshio region.According to these features, the solar activity data in the previous two years and the sea temperature data in the Kuroshio region before this spring can be used to analyze the trend of flood or drought in the MRYRin the coming summer.
    Related Articles | Metrics