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The Study of Ionospheric TEC during the Flare on Nov 22,1998 by Means of 4 GPS Receivers over China

ZHANG Donghe\ XIAO Zuo (Department of Geophysics,Peking University,Beijing,100871)  
By means of 4 dual\|frequency GPS receivers over china,the TEC in the ionosphere during solar flare on Nov 22,1998 is calculated.The results indicate that the flare,the X\|ray level of which is X3 7,cause obvious TEC enhancements in the ionosphere,the largest TEC enhancement caused by the flare is about 1.25 TECU.The characteristic of this method to study such ionospheric disturbances caused by flares is analyzed.It is concluded that this method can be used to study the ionosphere disturbances caused by solar flare,and can get more ionospheric disturbances information because of the special satellite constellation.
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