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《Chinese Journal of Geophysics》 1992-01
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THE EFFECT OF MAGNETOSPHERE-IONOSPHERE COUPLING ON MID-LATITUDE IONOSPHERES

ZI MIN-YUN (The Institute of Arts of China, Beijing ,100009)SHEN CHANG-SHOU(Geophysics Department, Peking University, Beijing 100871)  
The X-component of ground magnetic data from Beijing (BJ) and Qiongzhong (QZ) sta-tions are used to verify the existence of the effect of magnetosphere-ionosphere electrodynamic coupling on electric currents in mid-latitude ionospheres. The observations indicate that the direction of the average diurnal variations of X(BJ) and X(QZ) during both magnetic quiet and disturbed periods are opposite at day time. It means that these two stations locate at the northside and southside of the electric current focus caused by the ionospheric dynamo.The feature changes completely during the main phase of strong storms. The signs of the variation of these two stations are the same and one can often see that △X(BJ)△X(QZ). "Superposed epoch analysis is used for all the 21 events in 1982 in which Dst kept decreasing during the event (each event includes five hours, and the hour at which the ring current inflation rate, R, reaches its extreme negative value is taken as the key hour). The result of the analysis shows the generality of the phenomena shown in case study. The variations of X(QZ) and X(BJ) are closely related to the decreasing of R and the magnitude of △X(QZ) at key hour is similar to AX(BJ). The correlation coefficient between △6X(QZ) and△X(BJ) is as high as 0.98.Differing from the average variation of magnetic quiet and disturbed days, the similar response of X(QZ) and X(BJ) to the development of the ring current is a result of the equa-torward penetration of the high-latitude convection electric currents caused by the magnetos-pheric disturbance. The difference between the dynamic and electrodynamic couplings and the related physical processes are discussed as well.
【Fund】: 国家自然科学基金
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1 ZI MIN-YUN GAO YU-PEN(Department of Geophysics, Peking University, Beijing) (Institute of Geophysics, State Seismological Bureau)SHEN CHANG-SHOU(Department of Geophysics, Peking University, Beijing);A PRELIMINARY STUDY OF THE EFFECT OF LARGE SCALE MAGNETOSPHERIC DISTURBANCE ON EQUATORIAL ELECTROJET BY USING LOW-LATITUDE GEOMAGNETIC DATA OF CHINA[J];Chinese Journal of Geophysics;1988-03
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5 ZI MIN-YUN (The Academy of Arts of China, Beijing 100009)SHEN CHANG-SHOU(Department of Geophysics, Peking University, Beijing 100871);THE LOCAL TIME VARIATION AND REGIONAL DISTRIBUTION OF THE EQUATORIAL ELECTROJET CAUSED BY THE MAGNETOSPHERE[J];Chinese Journal of Geophysics;1993-05
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