1991 Vol. 11, No. 3

Display Method:
THE PERIODICITY OF AR5395 EVOLUTION
Lin Hua-an, Wang Shi-jin
1991, 11(3): 161-167. doi: 10.11728/cjss1991.03.161
Abstract(1450) PDF 494KB(636)
Abstract:
There are periodical characteristics in the evolution of AR5395 shown by analysing the observational data of X-ray flares and area of sunspot group. Fod AR5395 the variation of peak flux Fx of soft X-ray exhibits a periodicity about 24.3 hours, the periodicity for the occurrence rate Nx of X-ray flares is about 12.2 houds, and the area Sx of sunspot groups varies with 24.4 hours period. The phase relations among these three periodical parameters show: (1) the flares with Xclass generally appears at the decreasing phase of the peridlical variation of sunspot area; (2) the area of sunspot groups takes about 16 hours to reach the maximum in the 24.4 hours period; (3) the rate of occurrence of X-ray flares reaches the maximum before the appearance of Xclass flare about 12 hours. It seems that AR5395 is in a state of energy store-release-store cycle of large flares with a periodicity about 24 hours.
THE STRUCTURE OF THE MERIDIAN SOLAR WIND AND ITS EFFECT ON THE PROPAGATION OF CORONALMASS EJECTIONS
Guo Wei-ping, Wang Jing-fang, Yao Yong-qiao, Liang Bai-xian
1991, 11(3): 168-175. doi: 10.11728/cjss1991.03.168
Abstract(1588) PDF 535KB(2266)
Abstract:
Acombined scheme is developed to solve the ideal MHDequations. Keeping certain precision, this model has ensured stability and small computing capacity. Atwo-dimensional hemlet-streamer solution of the meridian solar wind near the sun is obtained. Using this solution as initial state, the effect of the hemlet-streamer configuration on the propagation of coronal mass ejections is investigated. It is found that the configuration deflects the ejected mass toward equator. This effect can explain some observational results satisfactorily.
THE EVOLUTIONARY FEATURES OF THE MAGNETICCONFIGURATION IN THE ACTIVE REGIONS ANDTHE SHORT-TERM PREDICTION OF THESTRONG SWF
Zhang Gui-qing
1991, 11(3): 176-186. doi: 10.11728/cjss1991.03.176
Abstract(1621) PDF 687KB(899)
Abstract:
The magnetograms of the longitudinal field in 18 actively regions for April-December, 1988 are analysed in the paper (Huairou Station, Beijing Observatory provieded the magneto-grams). Some magnetic precursors of SWFflares (The flare causing strong Short Wave Fade-out is called as SWF flare) are distingushed from the magnetograms of the longitudinal field. They are:1. Emergence of the magnetic flux. Amagnetic flux emerges in a magnetic area with the opposite polarity (Bl≥320G). The intensity of emerging magnetic flux is larger or equal to 160G.2. Incorporation of the magnetic fluxes with similar polarity. Among the magnetic fluxes of the similar polarity participating in the incorporation, the strongest magnetic intensity is equal to or larger than 320G, tthe weakest is equal to or larger than 80G. The maximum magnetic gradient near the incorporating area after the incorporation is equal to or larger than 0.15G/km.3. Invasion of a magnetic flux with opposite polarity. Amagnetic flux (Bl≥320G) invades into an area of the magnetic flux with opposite polarity (Bl≥320G) and is continuouisly encircled by the magnetic flux with opposite polarity to 70% of all or more.4. Asharp increase in the magnetic intensity. The growth rate of magnetic intensity in an area of the magnetic flux is 960 G/day or more.There is a close relation between the SWF flares and the magnetic precursors.
DISCUSSION OF PLASMA INSTABILITY BETWEEN SOLAR WIND AND TYPE-I COMET TAIL
Guo She-yu, Li Zhong-yuan
1991, 11(3): 187-192. doi: 10.11728/cjss1991.03.187
Abstract(1539) PDF 374KB(865)
Abstract:
In this paper, the "two-stream" plasma instability between solar wind and comet tail in a force-free field case is discussed. The data come from the exploration for comet Giacobini-Zinner by International Cometary Explorer Spacecraft. The conclusion shows that "two stream" instability exsists in the inner part of a comet if a resonable plasma distribution is considered.
NONLINEAR PROPERTIES OF THE SHEARED MAGNETO-HYDRADYNAMICS AT THE BOUNDARY LAYER OF THEMAGNETOSPHERE I. THE EFFECTS OF THEPERTURBATION OF FLOW ON MAGNETICFIELD
Wang Xian-min, Wang Jing-fang, Liang Bai-xian
1991, 11(3): 193-200. doi: 10.11728/cjss1991.03.193
Abstract(1736) PDF 509KB(927)
Abstract:
In this paper, using the method of cut off spectrum, the nonlinear properties of the sheared magnetohydradynamics at the boundary layer of the magnetosphere are investigated. The primary results are: (1) the perturbation of flow causes the K-Hinstability; (2) the system is sensitive to the initial conditions, this will lead to purturbations of the system and is an essential reason why the dynamic property of the magnetopause is difficult to predict; (3) the kinematic viscoisity and the interactions between flow and magnetic field may make the transfer of the momentum and energy; (4) the energy from outside may be transported into the system by the kinematic viscosity and couplings between flow and magnetic field.
THE IONIZATION OF SOLAR COSMIC RAY IN THE IONOSPHERIC D-REGION
Zong Qiu-gang, Ye Zong-hai
1991, 11(3): 201-208. doi: 10.11728/cjss1991.03.201
Abstract(1675) PDF 494KB(738)
Abstract:
Solar cosmic ray which propagates to the ionospheric D-region, especially in the polar cap ionospheric D-region, causes the PCAphenomena. In this paber, the solar cosmic ray ioni-zation formula in D-region is deduced from Bethe-Block formula that are more accurate than the previous treatment. Based on that, the formula of electron production is also obtained, and this computations is made with the solar cosmic ray importance, energy spectrum index, height, latitude taking into account so it is more accurate. The results show that the electron production rate of solar cosmic ray varies with different importances of solar cosmic ray and its energy spectra index. When the importance of solar cosmic ray event is the same (the integration flux is the same), the larger the energy spectra index is, the larger the electron proluction rate at high altitudes (>55km) is; the smaller the energy spectra index is, the larger the electron production rate at low height (>55km) is. The distribution of electron production rate with height have obvious two peaks, one is at 60km that is mainly caused by proton, the other is at 85km that is mainly caused by particles of z≥2.
ANALYSIS ON THE PROPERTIES OF THE RELATIONSHIP BETWEEN TIME-DELAY AND TAKE-OFF ANGLE
Si Jia-cai, Jiao Pei-nan
1991, 11(3): 209-216. doi: 10.11728/cjss1991.03.209
Abstract(1798) PDF 503KB(1028)
Abstract:
In this paper, the computer algorithm of the ray tracing in a sphyerically asymmetric and locally quasi parabolic electron density model is presented. The property curve of the variation of the group time-delay with the take-off angle is analyzed. The limitations of the traditional algorithm used in obtaining the minimum group time-delay is pointed out, and discussed of the correlation of the property curve with the backscatter ionogram are made. Properties of the power distribution on the backscatter ionogram is also discussed.
MAJOR AND TRACE ELEMENT CONCENTRATIONS FORCHONDRULES OF THE BOXIAN (LL4) CHONDRITEAND THEIR IMPLICATIONS
Chen Jiang-feng, Jiang Shan, Chai Zhi-fang, Ma Shu-lan, Ma Jian-guo
1991, 11(3): 217-225. doi: 10.11728/cjss1991.03.217
Abstract(1836) PDF 592KB(898)
Abstract:
Al, Mg, Mn, Na, V, La, Sm, Eu, Sc, Cr, F , Ni, Co, Au and Ir concentrations for 14 ch-ondrules from the Boxian (LL4) chondrite are analyzel by INAA. The average hulk chon-drule compositions normalized to Mg and Cl chondrite for the Boxian chondrite are identical to the ones for other unequilibrated ordinary chondrites (UOC's). Relations among the element concentrations for chondrules from the Boxian chondrite are discussed using the clustering and factor analysis. Afew precusor chemical components are implied, that is siderophile elements, refractory and moderately refractory lithophile elements and moderately volatile elements etc. This conclusion is compatible to the results from the study of other UOC's.
THE RESPONSES OF CARDIOVASCULAR DURING HEAD-UP TILT PLUS LOWER BODY NEGATIVE PRESSURE
Shen Xian-yun, Li Shu-chun, Xiang Qiu-lu, Meng Jing-rui, Yan Xiao-xia, Sun Ya-zhi, Xu Li-hua, Fan Ya-min, Zhuang Xiang-chang
1991, 11(3): 226-234. doi: 10.11728/cjss1991.03.226
Abstract(1584) PDF 554KB(912)
Abstract:
A method of head-up tilt plus lower body negative pressure (LBNP-HUT) is used in simulating the stress of gravity upon crewman after returing to the earth from spaceflight, in order to study the regulatory function of cardiovascular system. The subjects are 20 healthy young men. The examination consisted of a simple head-up tilt (HUT, 75°) experiment for twice, each lasting 20 min and two times of LBNT-HUT, of the latter -5333 Pa LBNP is acted with subjects in supine position on a tilt table for 2 min then the subjects are turned to HUT (75°) for 20 min while the LBNP is maintained. Four types of regulation are found, according to the responses of the subjects in heart rate, perpheral resistance and tolerance time during LBNP-HUT, which are vessel-type (VT), mixture-type (MT), heart-type (HT) and under regulation-type (URT). The cardiovascular regulative capacity during LBNP-HUTis in the order of VT>MT>HT>URT. The results show that the method of LBNP-HUT is an effective approach to examine the regulatory function of cardiovascular system, as it con provide larger stress upon the subjects than the simple method does, when only HUT or LBNP alone is applied. It can be used in the selection of cardiovascular function of astronauts.
RESULTS OF EXPERIMENTS ON THE EXPLORATION OFGENETIC EFFECT OF ROCKET FLIGHT FACTORSWITH DROSOPHILA MELANOGASTER
Lin Xian-zhe, Wang Gong-zhi
1991, 11(3): 235-240. doi: 10.11728/cjss1991.03.235
Abstract:
Observations on two tests in exploring genetic effect of the factors of T7A—S1 rocket flight with drosophila melanogaster show that the percentage of the eggs without X-chromo-some is increased and the percentage of the eggs with double X-chromosomes is not changed in the total number of eggs laid by female parents in the days after flight (mainly the fourth to sixth). The character is not that one or two individual laid a larger number of eggs without X-chromosome, but that there is an increase in the number of female parents laying those eggs. The result of test in the second flight shows that the percentage of chromosome bridge in the neuroblasts of the third instar larvae of the first filial generation produced by female parents in the fourth to sixth day after flight is increased. The above results prove that the genetic materials of reproductive cells of female parents are slightly affected.