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plasmaspheric trough evolution under different conditions of subauroral ion drift

Science China(Technological Sciences) 2012年第5期55卷 1287-1294页

作者： HE Fei ZHANG XiaoXin CHEN Bo FOK MeiChing Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China National Center for Space Weather China Meteorological AdministrationBeijing 100081China NASA Goddard Space Flight Center GreenbeltMD 20771USA

The statistical characteristics of the subauroral ion drift (SAID) in the ionosphere and the plasmaspheric trough evolution under different conditions of SAID were investigated in this paper, based on 566 SAID events observed by Akebono, Astrid-2, DE-2, and Freja satellites. The relationships between the latitudinal location of SAID and the Kp, AL, and Dst indices for these events were also discussed. It was found that the SAID events happened mainly at invariant latitude (ILAT) of 60.4° and magnetic local time (MLT) of 21.6 MLT and that 92.4% of the events happened when the Kp index was below 5.0, indicating a medium geomagnetic activity. The latitudinal half-width of SAID varied from 0.5° to 3.0° with a typical half-width of 1.0°. The SAID would happen at low latitudes if the geomagnetic activity was high. The effects of SAID on equatorial outer plas- masphere trough evolutions were studied with the dynamic global core plasma model (DGCPM) driven by the statistical results of SAID signatures. It was noted that locations, shapes and density of troughs vary with ILAT, MLT, latitudinal width, cross polar cap potential and lifetime of SAID events. The evolution of a trough is determined by the extent of SAID electric field penetrating into plasmasphere and not all SAID events can result in trough formations.

关键词： subauroral ion drift plasmaspheric trough dynamic global core plasma model simulation

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