Table of Content

    24 December 1985, Volume 5 Issue 4 Previous Issue    Next Issue
    The Fuzzy Classification of the Solar Cycle and the Prediction for the 22nd Solar Cycle
    Hu Fu-min;Jiang Ming-han
    1985, 5 (4):  237-244.  doi: 10.11728/cjss1985.04.237
    Abstract ( 1445 )   PDF (501KB) ( 924 )   Save
    In this paper, on the basis of fuzzy set theory the classification and the prediction of solar cycles are discussed. By using the method of fuzzy cluster analysis, a prediction for the 22nd solar cycle has been made. The results are as follows:The length of the declining time for the 21st cycle is 8 or 9 years; the begining time for the 22nd cycle is the year 1987 or 1988; the first minimum of the year, s mean value of the relative number is 4.3; the length of the ascending duration for the 22nd cycle is 4 years; the maxima of the year, s mean value of the relative number is 118.9; the length of the declining duration for the 22nd cycle is 6.5 or 8 years.
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    Field-Aligned Currents Distribution Deduced From the Global Electric Field Model
    Song Xiao-ting;Wu Lei;Zhu Gang-kun
    1985, 5 (4):  245-253.  doi: 10.11728/cjss1985.04.245
    Abstract ( 1335 )   PDF (556KB) ( 1161 )   Save
    In this paper the expressions of the Volland, s model of large-scale convection electric field revised by using the experimental data measured on board the satellite GEOS-2 and other sounders are summarized, and with this model the field-aligned currents are calculated. The expressions for the calculated field-aligned currents from the electric potential function are applied to the case of weakly disturbed conditions. The results of calculation are consistent with the observations by the satellite Triad (Iijima and Potemra, 1978). This means that the revised Volland, s model is reasonable and hence the magnetospheric dynamical characteristics derived from GEOS-2 are reliable.
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    Evolution of Electron Distributions in Electrostatic ionCyclotron Waves With Associated Parallel ElectricField and Analysis of Resulting Instabilities
    Wang Yuan-dian;Cai Heng-jin
    1985, 5 (4):  254-261.  doi: 10.11728/cjss1985.04.254
    Abstract ( 1431 )   PDF (476KB) ( 733 )   Save
    Electrostatic ion cyclotron wave (EIC)can induce anormalous resistivity and parallel electric field. In this paper, evolution of distributions of electrons is analyzed.The results show that the distribution can be divided in two groups-trapped part andrun-away part. Two-stream instability can flatten the distribution of the run-away electrons, resulting in a distribution with a long and flat tail. Such kind of distribution is instable to anormalous cyclotron resonance is certain velocity space, resulting in thermalization and pitch-angle scattering of the electrons, therefore the losses of parallel velocity of the electrons. As a result of development of such instability, a bump-on-tail distribution can be established, and a new instability develops and results in flattenning of the bump-on-tail. This instability can ramp the parallel velocity around a critical value. After that, although small part of electrons can be accelerated further, but very slowly, at same time be thermalized.Finally, the results of this paper are compared with the observation results of the wave fields and precipitating electrons, and general consistency is showed.
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    Atmospheric Electric Property Produced by Ionospheric Potential
    Zhuang Hong-chun
    1985, 5 (4):  262-270.  doi: 10.11728/cjss1985.04.262
    Abstract ( 1367 )   PDF (529KB) ( 933 )   Save
    Global distribution of electric potential, fields and currents in the atmosphere are calculated analytically under a given ionospheric electric potential distribution. The results show that the electric potential of ionosphere at an altitude of 100 km can map down to lower than 25km without obvious attenuation in an atmospheric electric conductivity which increases exponentially with altitude. The region with strong electric field is mainly in the lower atmosphere with altitudes below 20km, where the vertical components are 4-orders of magnitude larger than the horizontal components. The electric fields in middle and upper atmosphere are relatively weak, and the vertical components are at the same order of magnitude as horizontal components. An analytic method is proposed to calculate the influence of topography on atmospheric electric field.
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    Some Characteristics of Whistler Mode Waves Propagating Through the Low-latitude Ionosphere
    Xu Ji-sheng;Bao Zong-ti;Liang Bai-xian
    1985, 5 (4):  271-278.  doi: 10.11728/cjss1985.04.271
    Abstract ( 1444 )   PDF (565KB) ( 1035 )   Save
    In this paper, the propagation characteristics for rays and wave normals of VLFradio waves through the low-latitude ionosphere based on the 3-Dray tracing computation carried out for whistler mode waves are investigated by using an IGRF (1980) model. It is found that the ray paths of whistlers detectable on the ground can stably remain in a region around geom. lat. 10° for various ionospheric profiles, and that the downcoming rays focus remarkably in the same region, with a focus gain about 10.4 dB Besides, the results of computation show that the lowest latitudes of non-ducted whistler paths exhibit sharp cut-off near geom. lat. 6.5°.
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    The Statistical Analysis of Pc3 Geomagnetic Micropulsation in Beijing
    Yang Shao-feng;Feng Qiu-ju
    1985, 5 (4):  279-285.  doi: 10.11728/cjss1985.04.279
    Abstract ( 1398 )   PDF (463KB) ( 930 )   Save
    The data of Pc3 pulsations of the north component of the geomagnetic field from Huirou Micropulsation Observatory in Beijing have been statistically analysed, including their occurrence frequency, pulsation period corresponding to the maximum occurrence, the diurnal variation of both average period and average period and average amplitude. Acomparison of our main conclusions with some of other, s work are also made.
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    In Situ Measurements of the Upper StratosphericNegative Ion Composition and InferredSulphuric Acid Ion Thermochemistry
    Qiu Shi-yan;F. Arnold
    1985, 5 (4):  286-293.  doi: 10.11728/cjss1985.04.286
    Abstract ( 1433 )   PDF (521KB) ( 977 )   Save
    Negative ions, height profiles from 20 km to 41 km measured during the recent two balloon flights over south Prance (44°N) are published. Therrnochemical constants △G, △H and △S for some sulphuric acid cluster ions are inferred from the in situ ion composition measurements. The chemical contamination during ascent leg measurements is revealed to be caused from the ion chemical reactions involved in the reeva-poration of water vapor from balloon surfaces.
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    Sloshing of Liquid in Spherical Tank at Low-gravity Environments
    Wang Zhao-lin;Deng Zhong-ping
    1985, 5 (4):  294-302.  doi: 10.11728/cjss1985.04.294
    Abstract ( 1550 )   PDF (493KB) ( 1342 )   Save
    In the paper, the sloshing of liquid in a spherical tank is investigated under low-gravity conditions. After determination of the equilibrium shape of free surface of liquid, using a method concerning a kind of characteristic functions, expanded into po-lynominal expressions, the free and forced sloshing problem had been solved.The computer results for sloshing frequencies, dynamical coefficients and damping ratio had been obtained.
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    The Negative Phase Ionospheric Disturbance and its Solar-terrestrial Correlation
    Huang Qing-ming
    1985, 5 (4):  303-307.  doi: 10.11728/cjss1985.04.303
    Abstract ( 1281 )   PDF (375KB) ( 942 )   Save
    This paper deals with the morphology of negative phase ionospheric disturbances. The ionospheric stations involved are Manzhouli (49°35, N, 117°27, E), Beijing (40°00, N, 116°18, B), Chongqing (29°30, N, 106°25, E), Guangzhou (23°09, N, 113°21, E) and Haikou (20°00, N, 110°20, E) for the period of 1965-1982, and also the correlation of the ionospheric disturbances with solar flares, solar radio emission, and geomagnetic field are analyzed. The solar and geomagnetic data are taken from the Solar-geophysical Data published by National Geophysical Data Center, Boulder, Colorado, USAand Report of Geomagnetic Observation by Beijing Geomagnetic Observatory.
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    Thermal History and Trapped 40Ar/39Ar Ratio on Xinyang Meteorite
    Wang Song-shan;Hu Shi-ling;Sang Hai-qing;Qiu Ji
    1985, 5 (4):  308-313.  doi: 10.11728/cjss1985.04.308
    Abstract ( 1937 )   PDF (406KB) ( 734 )   Save
    The Xinyang meteorite fell on Dec. 1, 1977, in the Xiaowang Village of Xinyang County, Henan Province, China, It consists of X-Iand X-IIfragments mainly, and the masses are 48 kg and 27.5 kg respectively. Xinyang meteorite is an ordinary chon-drite, classified as belonging to group H6. The 40Ar/39Ar age spectrum of X-II is quite complex, but shows diffusional loss profiles. The gas released at low temperature yields low ages, with the apparent age increasing monotonically with increasing temperature, but the steps 3, 4 and 5 show a plateau which has a age of 4.42±0.1 b.y., followed by a decrease in apparent age, and then rising again to a plateau at 4.46 ±0.1 b.y. for the last 20% for gas release, at temperature greater than 960℃. The low-middle temperature release of abundant 40Ar* is associated with Ca-poor phases, undoubtedly the plagioclase. The high temperature release of 40Ar* is from Ca-rdch phases with low K/Ca ratios, almost certainly the bro-nzite. Thus it is possible that the ages of bronzite and plagioclase are 4.46 and 4.42 b.y. respectively. The cooling rates of Xinyang meteorite are 1.7 to 8.7℃/106 yr. during the early stage of evolution assuming that the closure temperature of 40Ar* of bronzite and plagioclase are 600° and 250℃ respectively, and the Rb-Sr age of this meteorite is 4.55 b.y. and 87Sr* closure temperature is 750℃.The 40Ar/39Ar age spectrum of Xinyang meteorite shows that there was a collisional event at 2.95 b.y. ago. And this meteorite has a exposure age of 6.0 m.y.. Atrapped 40Ar/36Ar ratio of Xinyang meteorite, 1.07±0.36, is obtained. Note that most of trapped 40Ar/36Ar ratios of lunar soil and breccias are about 1, it is possible that the trapped argon of lunar and meteorites originated in the solar wind.
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    Near-Earth Charge Composition of the Galactic Cosmic Rays
    Chen Ming-yun;Ren Guo-xiao;Zhou Yin-zao;Huang Rong-qing
    1985, 5 (4):  314-316.  doi: 10.11728/cjss1985.04.314
    Abstract ( 1313 )   PDF (193KB) ( 1030 )   Save
    The plastic nuclear track detector CR-39 is exposed for about 10 hours in balloon observation in 1982. The relative abundance (E>3.6 GeV/n) of the galactic cosmic rays is obtained and compared the result with the satellite data.
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