空间科学学报

1993 Vol. 13, No. 4

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THE REVIVAL MECHANISM OF THE POST FLARE ARCH OF6-7 Nov., 1980

Tang Yu-hua, Cui Lian-shu

1993, 13(4): 245-252. doi: 10.11728/cjss1993.04.245

Abstract(2750) PDF 502KB(846)

Abstract:
The post flare coronal arch of 6-7 Nov., 1980 was formed at three hours a-fter the onset of the parent flare (AR2779) and revived 11 hr and 25 hr after its formation. Both these revivals were caused by two-ribbon flares with growing systems of loops. It is proposed in this paper that shock wave, which was produced by the parent flare, and Petschek reconnection are effective revival mechanisms for post flare arch of 6-7 Nov., 1980. The energy equation taking into account radiati ve cooling, heat conduction, shock wave heating, and Petschek reconnection is deri-ved and computed. The calculated results are in agreement with observational cur ves given by Svestka according to SMMdata.

THE HEATING OF SOLAR WIND PROTONS THROUGH ENERGY CASCADE OF ALFVENIC FLUCTUATIONS

Tu Chuan-yi, Li Man-ke

1993, 13(4): 253-261. doi: 10.11728/cjss1993.04.253

Abstract(2139) PDF 639KB(867)

Abstract:
The observations by Helios 1 and 2 spacecrafts showed that with increasing hiliocentric distance the proton magnetic moment and the proton’s second invariant decreases. This phenomena indicates that some heating is required for the proton perpendicular temperature while some cooling process is required for the proton parallel temperature. No theory which is consistent with observations has been pubished to explain the phenomena. Based on Alfvenic fluctuation’s model of Tu 1988 and the quasi-linear theory of proton-cyclotron resonance, a model which can describe the inversion of the energy cascade of Alfvenic flucturations to the heat of protons and the inversion of the parallel energy to the perpendicular energy is developed. This model can explain the perpendicular heating and parallel cooling of the protons in the solar wind.

MORPHOLOGY ANALYSIS OF MID AND LOW LATITUDE IONOSPHERIC RESPONSE TO GEOMAGNETIC STORM

Zhang Qi-wei, Guo Jian-shan, Zhang Gong-liang

1993, 13(4): 262-270. doi: 10.11728/cjss1993.04.262

Abstract(2472) PDF 677KB(1076)

Abstract:
Using the ionosonde data at 12 stations in East Asia, the response of mid and low latitude ionosphere to geomagneitc storm is analyzed for a typical case of August 27, 1978. Four processes affecting the mid and low latitude ionospheric disturbance morphology are discussed. Accompany with SSC, their appears the sudden increase of the peak density and decrease of its height; the storm circulation causes negative phase usually appears at the main phase of geomagnetic storm with the decrease of the peak density and increase of its height; TIDcan cause the small scale disturbances superposed in negative phase; and the movement of the equqatorial anomaly crest caused by neutral wind or electric field disturbances is the most important factor to determine the ionospheric storm morphology at stations near the crest.

A DIURNAL-VARYING REFLECTION MODEL FOR LOWER IONOSPHERE

Tang Ming, Pan Wei-yan, Tian Yu-shu

1993, 13(4): 271-277. doi: 10.11728/cjss1993.04.271

Abstract(2256) PDF 432KB(962)

Abstract:
Amodel of lower ionosphere with non-spherical surface moving horizontally is proposed for wave reflection during sunrise and sunset. Combined with spheric surface for reflaection during day and night, this model can be made quite perfect to explain the well-known diurnal variation of reflection from lower ionosphere. Aconcept about reflection region is presented, upon which the formulae for calculating field-strength of sky wave are modified to be the integral form and they can be applied in more general cases. Finally, the amplitude and phase, as well as their diurnal variation, for sky wave propagation at LFband by one-skip mode on two paths are calculated. One path is from station Mto Qindao, the other is from station, Mto Xinxiane. The results are analysed and compared with the experiments.

TRANSPORT EQUATION OF INTERNAL GRAVITY WAVES IN A DISSIPATIVE ATMOSPHERE

Yi Fan, Xiao Zuo

1993, 13(4): 278-285. doi: 10.11728/cjss1993.04.278

Abstract(2220) PDF 529KB(1002)

Abstract:
Observed atmospheric gravity wave field consists of a large number of ensemble of spectral components with various spatial and temporal scales. Nonlinear interaction may yield energy transfers among the spectral components, consequently resulting in an evolution of wave spectrum. This is called the internal transfer process in the gravity wave spectrum. Starting from the nonlinear interaction equations of gravity waves in a disspative atmosphere, a transport equation is derived by using the ’random phase approximation’. Since the molecular dissipation is taken into account, the evolution rate of the gravity wave spectrum has been changed. The transport equation provides a basis for studying the budget and balance of gravity wave energy in the middle and upper atmosphere.

ANTISTATIC FILM’S PERFORMANCE AND ITS APPLICATION TO SATELLITE

Lu Yu-sun, Li Hua, Cai Cun

1993, 13(4): 286-291. doi: 10.11728/cjss1993.04.286

Abstract(2564) PDF 383KB(963)

Abstract:
In this paper, the measured results of the electric and optical performance of ITO, IOand TOfilms are given. These films are prepared on the substrates of flexible Kapton, Mylar and FEP Teflon by the magnetron sputtering. The tests indicate that their stabilities under various conditions are quite good. The conductivity of the antistatic films in the simulated substorm environment is also measured. The results show that the modified flexible SSMcan eliminate the charge accumulation on their surfaces and control the surface voltage below 80 Volt. On the contrary, the potential on the uncoated SSMsurface can have a value up to 8 -10 kV.

EFFECTS OF SPACE PARTICLE RADIATION ON INTEGRATE CHIPS IN THE SATELLITE

Pu Jian, Ye Zong-hai

1993, 13(4): 292-298. doi: 10.11728/cjss1993.04.292

Abstract(2808) PDF 494KB(1115)

Abstract:
This paper analyses energy deposit in critical volumes of integrate chips, whi-ch produced by some radiated particles in Feng Yun-1 (B) satellite environment. That is called linear energy translation (LET). We have obtained the LETof Galactic Cosmic-Ray components 1 ≤Z≤28, Galactic Cosmic-Ray anomaly components (C, N, O, Ne, Ar, Fe), and inner radiation belt protons. And single event upset (SEU) ratioes produced by these particles are caculated respectively.

DIGITIZING AND ANALYSIS OF THE LEPEDEA DATA OF ISEE SATALITE

Huang Han-hui, Zong Qiu-gang, Ye Xiao-wei, Xu Rong-lan, Xu Bing-chun, Yu Gang, Ge Hua

1993, 13(4): 299-305. doi: 10.11728/cjss1993.04.299

Abstract(2474) PDF 453KB(902)

Abstract:
The energy-time spectrograms for positive ion and electron of the earth’s magn-etotail measured with quadrisphorical LEPEDEAon board ISEE1 and ISEE2 are digitized by using spectrogram analysis method. The data of the magnetotail plasma and magnetic field can be analysed in quantitative for the particle dynamics in magnetotail; even for fibre structure currents in the tail.

SHORT WAVE RAY TRACING IN THE IONOSPHERE

Suo Yu-cheng

1993, 13(4): 306-312. doi: 10.11728/cjss1993.04.306

Abstract(2905) PDF 428KB(1196)

Abstract:
In accordance with the requirement of ground communication system of remote distance for short wave band, on the basis of the model calculation of the mean background of ionospheric parameters, a method is presented for calculating the trace of short wave ray in ionosphere. The work is mainly concentrated on two aspects. First of all, bacause the frequency of short wave is relatively higher, the magnetic and collision effects in refractive index are neglected, so that general ray equations are simplified. In the second place, a method of calculatitng he first-order partial derivative of ionospheric plasma parameter is presented. The calculation of the partial derivative is on the basis of model result of parameters of each ionospheric layer, that is, on the basis of mean background of ionospheric parameters.It can be used in HFcommunication system, and other short wave system such as target position system of HFradar, etc.

A STATISTICAL PROPERTY OF SOLAR PROTON FLARES

Wang Jja-long

1993, 13(4): 313-315. doi: 10.11728/cjss1993.04.313

Abstract(2231) PDF 192KB(758)

Abstract:
Astatistical study of solar proton flares in this paper reveals a property of proton flares that most of the solar proton flares studied and the solar disk center are located on the same side of the neutral line of the large scale, averaged line of sight component of solar magnetic fields in the photosphere. This finding would be of some significance for proton flare research and prediction.

A COMPARISON OF f₀F₂ OBSERVED AT 8 STATIONS OF CHINA WITH THAT PREDICTED FROM THE IRI-90 MODEL

Shen Chang-shou, Xiao Zuo

1993, 13(4): 316-321. doi: 10.11728/cjss1993.04.316

Abstract(2479) PDF 485KB(689)

Abstract:
The new version of the IRImodel is introduced and compared with the IRI-86 model. Data of f₀F₂ from 8 Chinese stations and that predicted by IRI-90 and IRI-86 are used in a statistical analysis for solar spot minimum years (1974-1976). The results indicate that the new version is more applicable than IRI-86 for east part of China.