Table of Content

    24 August 1985, Volume 5 Issue 3 Previous Issue    Next Issue
    The Corotating Variation of Heliospheric Quantities (I) -Average Features in the 20th Solar Cycle
    Zhang Gong-Hang;Guo Yu-fen;Lu Chen
    1985, 5 (3):  155-160.  doi: 10.11728/cjss1985.03.155
    Abstract ( 1444 )   PDF (415KB) ( 1124 )   Save
    The corotating variation of various heliospheric quantities at 1 AUis studied statistically for the 20th solar cycle, and the results obtained are organized in this paper as a function of the ordinal days in the Carrington rotation. The discussion given here involves the basic quantities, i.e. the solar wind speed, temperature, number density and the IMPintensity; the flux densities of kinetic and magnetic energy, enthalpy and particle; the various sound speeds, i.e. the adiabatic sonic and the Alfvenic wave speeds, and the magnetosonic speed; as well as the Mach numbers, i.e. the thermal sonic, the Alfvenic and the magnetosonic Mach numbers. The main results can be summarized as follows:(1) The average corotating variation of heliospheric quantities shows a marked two-peak feature characterizing the two-stream structure of the longitudinal distribution of coronal-hole high-speed stream in the Carrington rotation.(2) The various energy densities and flux densities reach the maxima in the interaction region between the high and low speed streams.(3) The high speed stream always has the higher sonic velocities and the pressure to kinetic energy ratios, and in particular, the lower Mach numbers as compared to the low speed stream.(4) On the average, it is statistically insensitive for the plasma p parameter to the variation in the coronal-hole high-speed stream.
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    The Curvature Radiation from Cosmic Monopole
    Li Xiao-qing;Li Zhong-yuan
    1985, 5 (3):  161-167.  doi: 10.11728/cjss1985.03.161
    Abstract ( 1562 )   PDF (394KB) ( 7490 )   Save
    The curvature radiation resulting from cosmic monopole is investigated in detail. It is shown that there are suppressed effects for cosmic plasma on the curvature radiation of monopole.
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    Instabilities in the MD Type Spiral Sector Transition Region of the Interplanetary Magnetic Field
    Zhu Lie;Wang Shui;Zhao Xue-pu
    1985, 5 (3):  168-172.  doi: 10.11728/cjss1985.03.168
    Abstract ( 1422 )   PDF (333KB) ( 875 )   Save
    By using a six-layer model, the stabilities of MDtype spiral sector transition region in the interplanetary magnetic field are discussed. The results show that the MDtype transition region is also unstable, the large-scale waves may be excited in MDtype transition region. The differences between MDand MEtype transition region stabilities are discussed, too.
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    Ion Acoustic Solitary Waves in a Beam Plasma System
    Song Li-ting
    1985, 5 (3):  173-181.  doi: 10.11728/cjss1985.03.173
    Abstract ( 1523 )   PDF (502KB) ( 923 )   Save
    For a warm beam plasma moves through the background plasma, the Korteweg de-Vries equation is derived by using the reduced pertubation method for hydrodynamic equations governing the plasma system. Under the weak beam conditions, there are four ion acoustic wave modes, of which, two correspond to the slow and fast solitary waves. The amplitudes of these solitary waves in relation with the parameters of plasma are calculated. It is found that large positive and negative solitary waves can occur over certain parameter ranges.
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    Use of a Global Effective Sunspot Number IG12 for Long-term Ionospheric Predictions
    Liu Bui-yuan;Liu Ke-feng;Zhou Yu-zhi
    1985, 5 (3):  182-190.  doi: 10.11728/cjss1985.03.182
    Abstract ( 1719 )   PDF (643KB) ( 1022 )   Save
    The possibility of the use of a global effective sunspot number IG12 for long-term ionospheric predictions is investigated in this paper based on the data of vertical incidence sounding stations in China. It is shown that the relationship between the ionos-pherically-derived index IG12 and the ionospheric characteristic (f0F2 or F2(3000)MUF) is better than that between sunspot number R12 and the ionospheric characteristic.The efficacy of the use of IG12 for predicting f0F2, M(3000)F2 and F, (4000)MUFis evaluated, using CCIR Report 340, by comparison with R12 in current use. The evidence presented shows that the use of IG12 instead of R12 in the CCIRprediction scheme yields more accurate values of f0F2 and F2(4000)MUF. In the predictions of f0F2 and -F2(4000)MUF 12-month in advance. The average improvments in accuracy are about 18% and 10% respectively. Other advantages arising from the use of the IG12 index are also discussed.
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    Measurements of the HF Backscatter Echo Spectra
    Jiao Pei-nan;Zhang Xiu-ju
    1985, 5 (3):  191-198.  doi: 10.11728/cjss1985.03.191
    Abstract ( 1341 )   PDF (543KB) ( 1169 )   Save
    In this paper, the HPbackscatter echo spectra measured by the technique of the pulse Doppler radar. The Doppler spectra are displayed in 3-dimensonal (time delay-power-Doppler frequency) spectrograms, i.e. the scatter function of the HPbackscatter propagation channal. The typical spectrograms are studied and the vertical motion velocity of the equivalent reflection height of the ionosphere are infered from the Doppler spectra. The values of the velocity are in accord with that infered from the vertical sounding data.
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    Critical Frequencies of E-layer in Mid-latitudes and theCalculations of Electron Density Profiles inthe Lower Ionosphere
    Wang Xian-lin;Huang Ze-rong
    1985, 5 (3):  199-208.  doi: 10.11728/cjss1985.03.199
    Abstract ( 1415 )   PDF (576KB) ( 738 )   Save
    In this paper, experimental formulae of the critical frequencies of the E-layer in mid-latitudes and of the distribution of electron density in the lower ionosphere are found. These formulae are expressed in terms of the sunspots number, the solar zenith angle and the local time. The results of calculations from them for different years, months, days for both before and afternoon time and calculations for propagation of the long radio wave and its absorptions are all in agreement with data of observations. In addition, it is possible to calculate the distribution of electron density in the D-region from f0E obtained by vertical soundings.
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    The Sector Boundary of IMF and the Geomagnetic Disturbance
    Xie Liu-xiang;Du Heng
    1985, 5 (3):  209-213.  doi: 10.11728/cjss1985.03.209
    Abstract ( 1520 )   PDF (339KB) ( 610 )   Save
    The variation of the geomagnetic indices AE, Dst, the frequency of occurrence of disturbance day ND and quiet day NQduring the time before and after the earth’s passage through the sector boundary of the interplanetary magnetic field (IMP) is studied. According to the change of the polarity of IMF at the sector boundary, the sector boundaries can be divided into the following types: (I) from negative to positive polarity; (II) from positive to negative polarity; (III) from negative to a varied polarity, and (IV) from positive to a varied polarity. The results are:The sector boundary type Iand IIcan be regarded as one of the sources of the geomagnetic disturbance. After the earth’s passage through the sector boundary the geomagnetic indices increase (but NQdecreases) and remain constant in three days.For sector boundary type III and IV, the variation of the IMF and geomagnetic indices are rather complicated. It is found that before the earth’s passage through the sector boundary, AE, Dst and ND have already increased and NQ decreased.
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    Ionospheric Effects of Solar Flare of Sept. 4, 1982
    Tan Zi-xun;Huang Xin-yu
    1985, 5 (3):  214-220.  doi: 10.11728/cjss1985.03.214
    Abstract ( 1342 )   PDF (704KB) ( 710 )   Save
    In this paper, ionospheric and geomagnetic transient effects and after-effects caused by the large solar flare with two bright branches of Sept. 4, 1982 are analyzed comprehensively. The results show that most of the effects are remarkable. It may relate to the particular severity of this magnetic storm.
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    Comparison of Air Densities from Air Drag upon Artificial Satellites With Models MSIS and CIRA1972
    Feng Zhan-liang;Xu Pin-xin
    1985, 5 (3):  221-227.  doi: 10.11728/cjss1985.03.221
    Abstract ( 1497 )   PDF (414KB) ( 689 )   Save
    In this paper air densities are determined by using the air drag data of several Chinese satellites and are compared with models MSISand CIRA 1972 respectively. The comparison shows that, at the heights considered in this paper, MSISfits observations better than CIRA 1972.
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    Characteristic of the Distribution of Rare Gases and Preliminary Discussion of Thermal History in the Jilin
    Li Zhao-hui;Xu Zi-tu;F. Begemann;H. Weber;O. Braun
    1985, 5 (3):  228-235.  doi: 10.11728/cjss1985.03.228
    Abstract ( 1611 )   PDF (656KB) ( 878 )   Save
    The concentration of cosmogenic and radiogenic rare gases in the Jilin present great variation. There are approximate linear correlation between cosmogenic 3He, 20, 21, 22Ne and 38Ar, and between radiogenic 4He and 40Ar. There are approximate linear correlation between radiogenic 4He, 40Ar and cosmogenic 60Co as depth of the jilin meteorite, but there not linear correlation between radiogenic 4He, 40Ar and cosmogenic 21Ne as depth scale of the Jilin parent body. These results have been shown that the distribution of concentration of 4He and 40Ar in the Jilin meteorite is inhomogeneous, and it is irregular in the Jilin parent body, and that the concentration of 4He and 40Ar increase toward from surfase to center in the Jilin meteoroid. We try to explanation unique characteristic of the distribution of 4He and 40Ar concentration in the Jilin with impact effects between Jilin parent body and asteroids.
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