空间科学学报

1985 Vol. 5, No. 3

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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(2039) PDF 415KB(1131)

Abstract:
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.

The Curvature Radiation from Cosmic Monopole

Li Xiao-qing, Li Zhong-yuan

1985, 5(3): 161-167. doi: 10.11728/cjss1985.03.161

Abstract(2240) PDF 393KB(7500)

Abstract:
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.

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(1803) PDF 333KB(883)

Abstract:
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.

Ion Acoustic Solitary Waves in a Beam Plasma System

Song Li-ting

1985, 5(3): 173-181. doi: 10.11728/cjss1985.03.173

Abstract(2341) PDF 501KB(934)

Abstract:
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.

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(2397) PDF 643KB(1035)

Abstract:
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.

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(2020) PDF 542KB(1181)

Abstract:
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.

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(2192) PDF 576KB(757)

Abstract:
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 f_0E obtained by vertical soundings.

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(2139) PDF 338KB(616)

Abstract:
The variation of the geomagnetic indices AE, D_st, the frequency of occurrence of disturbance day N_D 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, D_st and N_D have already increased and N_Q decreased.

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(1917) PDF 703KB(717)

Abstract:
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.

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(2178) PDF 414KB(701)

Abstract:
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.

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(2654) PDF 656KB(884)

Abstract:
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.