1991 Vol. 11, No. 2

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TWO-DIMENSIONAL MAGNETOHYDRODYNAMIC EQUILIBRIAIN THE SOLAR CORONA
Wang Shui, S. T. Wu, A. H. Wang
1991, 11(2): 81-90. doi: 10.11728/cjss1991.02.081
Abstract(1546) PDF 578KB(991)
Abstract:
By using a method in combination with analytical and numerical methods, the paper treats the two-dimensional magnetohydrodynamic equilibria of an inviscid compressible, perfectly conducting plasma with an embedded magnetic field in the spherically symmetric gravitational field of the sun. Two different solutions are obtained. (1) Aclass of steady, self-consistent plasma flows corresponding to the structure of magnetic field consisted of the closed and open regions is given. In the open region, the radial velocity of plasma can be reached the large values exceeded the local sound speed and Alfven speed beyond the several radius of the sun. (2) The plasma velocity is always smaller than the local sound and Alfven speeds. When the radial distance is large, it tend to zero.
A KINETIC CROSS-FIELD STREAMING ELECTROSTATICINSTABILITY FOR TRANSMITTED IONS WITHIN THEBOW SHOCK FRONT
Xu Yue-min, Zhou Guo-cheng, Zhu Lian-fang
1991, 11(2): 91-97. doi: 10.11728/cjss1991.02.091
Abstract(1668) PDF 466KB(853)
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The kinetic cross-field streaming electrostatic instability drivenby transmitted ions in high Alfven Mach number regime within the Earth's bow shock front near quasi-pependicular shocks is studied in this paper. The results show that the maximum growth rate for flat-topped electron distribution are greater than that in the case of Maxwellian distribution.
EFFECTS OF THE ATMOSPHERIC PLANETARY WAVES ON RADIO WAVE PROPAGATION AT LF AND VLF
Ruan Xie-qin, Zhang Xun-jie, Huang Ze-rong
1991, 11(2): 98-107. doi: 10.11728/cjss1991.02.098
Abstract(1535) PDF 687KB(987)
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In this paper, using the method of the maximum entropy spectrum estimation, three kinds of data are analysed. They include phase and amplitude of LFand VLFobserved in the Eastern hemisphere (20°S-65°N, 13°E-141°E), Ly-α radiation flux measured by satellite, and the planetary wave in the high latitude during three winters from 1985 to 1988. These results show that(1) The phase disturbances at LFand VLFhave periods with 2-2.2, 3-4, 6-12, 12-20 and 20-32 days, while the solar I.y-α radiation flux presents 20-30 days fluctuation as well.(2) In the winter, larger amplitude distubmces at LFhave fairly good correlation to the planetary wave H1 observed in the high latitude (60°N), valleys and peaks of their wave forms correspond each other except shifting about 3-4 days in the time axis. Cross correlation coefficients are between 0.65 and 0.85, We also notice that there are little differences between them.The observed results are compared with those of the spectral analyses, and considered that Ly-a radiation flux variation could be a reason which causes disturbances of LFand VLFwith period more than 20 days, while those with periods ranging from 2 to 20 days seem to be controled by the planetary waves from the stratosphere and troposphere.
THE STUDY ON ELEMENTAL ABUNDANCES OF 10 CHONDRITES IN CHINA
Yi Wei-xi, Wang Dao-de, Ouyang Zi-yuan, Zhong Hong-hai, Jiang Li-jin, Yang Xiao-hui, Hu Guo-hui
1991, 11(2): 108-117. doi: 10.11728/cjss1991.02.108
Abstract(1677) PDF 644KB(1145)
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Precise determination of about 40 elemental abundances in 10 chondrites from China, which are Ningqiang CV3; Wuan H6; Qingzhen EH3; Suizhou L6; Zaoyang H5; Nantong H6; Zhaodong L4; Guangnan L6; Dontai LL6; Nan Yang Pao L6, are carried out by Instrumental Neutron Activation Analysis (INAA). The fractionation of all classes of chondrites relative to Cl tends to increase with the elemental volatility. The fractionation factors of REErelative to that of the type 1 carbonaceous chondrite are as follows: enstatite 0.67; oli-vine bronzite 0.78; hypersthene 0.83; type 2 carbonaceous (Murchison) 1.12; type 3 carbonaceous 1.29, thus showing a tendency to decrease in the order of C3, C2, C1, L, H, Egroups. Ningqian Chondrit is an anomalous CVchondrite containing a low abundances oFbulk refractory lithophiles.
A REPORT OF GROUND EXPERIMENTS FOR BRAIN FUNCTION IN SPACE
Mei Lei
1991, 11(2): 118-123. doi: 10.11728/cjss1991.02.118
Abstract(1483) PDF 604KB(740)
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The brain function is of crucial importance in space adaptation and astronaut performance. According to the theory of nonequiliblium fluctuations a new technology, ET (Elec-troencephalofluctuography [EEFG] Technology), has been developed in our laboratory for space application. Information of different attracters, especially the dominant supra-slow (S) oscillations of the brain can be abstracted from the fluctuating brain waves. Specific Sspectral lines related to neurophysiological and neuro-chemical activities have been identified and charcteristic spatial patterns have been figured out. ETanalysis has been carried out in a series of ground experiments: (1) 20 degrees head lowered suspension experiments in rabbits; (2) 2Gz hypergravity experiments in rabbits; (3) effects of antimotionsickness drugs on rabbits during suspension; (4) clincal observations on patients with brain circulation diseases. Valuable information has been collected in all these experiments, which can hardly be obtained by means of other existing techniques. The potentiality of ETapplication in space research was discussed.
MICROGRAVITY ENVIRONMENT IN DROPCAPSULE
Zhao Guang-heng, Lou Yue
1991, 11(2): 124-132. doi: 10.11728/cjss1991.02.124
Abstract(1390) PDF 591KB(782)
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In this paper, some coordinate systems used in analysing the dropcapsule motion are buiIt, the mathematical model used in solving the parameters of attitude motion is given. According to the physical background of micro-g acceleration in the dropcapsule, mathematical description and physical explaination of micro-g environment are presented, the expression of micro-g acceleration at arbitrary point in the dropcapsule is led out. This paper points out that the major factors influencing the level of micro-g are aerodynamic drag and attitude motion. Lastly, the levels of micro-g in the dropcapsule are analysed and estimated, the numerical calculations are carried out for micro-g acceleration generated by the drag. The calculation results show that the dropcapsule released from the-height of 30 km and above will provide up to 30-40 seconds of micro-g time with g-levels of <5×10-2g.
CALCULATION OF THE UPPER BOUND OF NEGATIVE POTENTIALS OF SPACECRAFTS IN A GEOSTATIONARY ORBIT BY USING THE LOCAL CURRENT BALANCE MODEL
Wu Qing-song, Jiang Rong-fu, Xu Yan-hou, Wang Bo-yi
1991, 11(2): 133-141. doi: 10.11728/cjss1991.02.133
Abstract(1609) PDF 606KB(898)
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In this paper, by using the local current balance model, the charging magnitudes of electrically-isolated, shaded surfaces of a spacecraft are calculated for different shapes and materials. The upper limits of the negative floating potentials calculated are the representations of the "worst case" of spacecraft charging in a geostationary orbit. The calculations also indicate that a multiple floating potential phenomenon for some materials of spacecraft may occur.
SYNTHETIC ANALYSIS OF OBSERVED DATA OF THE TWO-RIBBON SOLAR FLARES AND ASSOCIATED PHENOMENA FOR THE EVENT OF THE 3rd FEBRUARY, 1983
Li Chun-sheng, Hu Ju Fang, Cheng
1991, 11(2): 142-151. doi: 10.11728/cjss1991.02.142
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Under the consideration of a tentative unified model of magnetic arch, neutral sheet and arcade, this paper analysis synthetically the observed data of two-ribbon flares and associated phenomena on Feb. 3, 1983. It is shown that there exists a close connection between the physical precesses of nonthermal and thermal emissions in the two-ribbon flares, and, in particular that the nonthermal electrons from source regions of type HI, type IVμ and other type IVbursts are responsible for hard X-ray and r-ray bursts and Hα bright ribbons while the above mentioned magnetic structures move freely along the vertical direction and horizontal direction.
RELATIONSHIP BETWEEN THE VARIATIONS OF SHORTWAVELENGTH ULTRAVIOLET RADIATION AND THEFLUCTUATIONS OF OZONE CONTENT
Tai Hong-sheng
1991, 11(2): 152-155. doi: 10.11728/cjss1991.02.152
Abstract(1494) PDF 297KB(638)
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Short wavelength ultraviolet radiation and ozone content measured at low latitude (in India) showed that if ozone content decreases 3%, then variation of UVradiation (290 nm) reaches 35%. This value is larger than that from some theoretical predictions, but a simple formula given in this paper, which describes the relationship between the variations of ozone content and UV radiation, could be used to explain the above observations.
Qin Zhi-hai
1991, 11(2): 156-157. doi: 10.11728/cjss1991.02.156
Abstract(1432) PDF 119KB(952)
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1991, 11(2): 158-160. doi: 10.11728/cjss1991.02.158
Abstract(1388) PDF 190KB(416)
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