【摘要】 从FREJA卫星近期观测发现，地球低极尖区等离子体密度的衰减有多种可能的机制，不同机制所形成的密度空穴都可能捕获低混杂频率附近的湍动波，进而使原有的密度空穴加深．由于同时检测到静电和电磁的低混杂小尖峰，故提出电磁低混杂湍动的电场分量被密度空穴所捕获．更多还原

【Abstract】 The plasma density dePlehons may be resulted from four mechanisms, evidencesof which are shown by the observations of FREJA satellite. The density cavitonscaused by different mecheanisms may trap the dsent waves at low-hybrid freqdency.The lower-hybrid spikelets are observed with electwtatic and electromagnetic modes.It is suggested that the electric component of the elecromagnetic low-hybrid turbulenceis trapped by the density cavitons.更多还原