INTERBALL-2卫星MEMO实验观测结果的初步分析

Preliminary Analysis from the MEMO Experiment On-Board INTERBALL-2 Satellite

利用INTERBALL－2卫星上多分量波测量实验（MEMO）在ELF／VLF／LF三个频段进行的高分辨率等离子体波观测结果，通过事件分析，给出了所观测到事件的波传播特性的枯值。结果表明：对于极区千米波辐射（AKR），R－X模式和L－O模式可以同时发生。前者在低频段，后者则发生在频率高端，两者传播是在准平行于地磁场方向的波法线方向上。VLF嘶声发射表明主要是哨声模式，但其它模式也存在。利用波特性分析方法，局域等离子体频率的低频截止L＝0得到精确估值。

Plasma wave propagation characteristics are estimated, by using measarement in the MEMO experiment on board INTERBALL-2 satellite with high frequency resolution in three frs(luency bands: ELF/VLF/LF. Result shows that the AKR emission observed just above source regions are identified, and R-X and L-O modes are found in the same event. The former is at the lowest frequencies and the latter at the highest. Both propagate with wave normal direction weakly oblique or quasi-parallel to the Earth magnetic field. VLF Hiss emission demonstrate mainly in whistle mode, but the other mode may be present. By the wave characteristic analysis method, local plasma frs quencies accurately are estimated when the low L= 0 cutoff frequency obtained.