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Ground magnetic characteristics of the storm-time ring current Asymmetry

【摘要】:正Using the minute data of the H component of geomagnetic field from the 20°E magnetic meridian chain and the 30°N magnetic latitudinal chain,the temporal evolution characteristics of the equatorial ring current during the storm on November 7—10,2004 are studied.It is indicated that the UT-MLT and UT-MLAT graphics extremely exhibit the local time distribution,latitudinal variation and temporal evolution of the H component.The results show:(1)The UT-MLT contour clearly shows the increasing of the H component mostly around noon during the initial phase,representing the geomagnetic effect from the magnetopause current system.During the main phase,most negative values of the H component appear around the dusk-side,indicating the dawn-dusk asymmetric distribution of the ring current. (2)The contour of UT-MLAT suggests the latitudinal variation of the H component decreasing with the enhancement of the latitudes during geomagnetic storm,which is in good agreement with the D_(st) index.The latitudinal variations provide a new sight for describing the temporal characteristics of the intensity of the storm-time ring current.(3)Both the contours of UT-MLT and UT-MLAT are useful to monitor the space-time distribution of the equatorial ring current.

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