2009年夏季极区电离层加热实验观测研究

OBSERVATION OF THE POLAR IONOSPHERIC HEATING EXPERIMENT IN SUMMER 2009

2009年夏季,中国在挪威特罗姆瑟(Tromsφ)利用非相干散射雷达进行电离层加热实验。实验中发现了处在150km附近的小范围温度增强事件和150—400km之间的大范围温度增强事件。前者的相对增幅明显,后者的绝对增量更大。对这两类加热事件来说,温度增量百分比均随加热功率的增加线性增长,但对比两类加热事件来看,增长速度随加热频率增大而减小。加热效应存在显著的二维分布特征,加热最强方向处在场向附近。加热效应受加热天线波束指向与地磁场的夹角影响明显,随夹角增大温度增强效应减弱。

Using the incoherent scatter radar,the polar ionospheric modification experiments are carried out in summer 2009 at Troms,Norway. The electron temperature enhancements in the heating campaign can be distinguished to two kinds： a small scale structure near 150 km with a larger relative enhancement and a large scale structure between 150—400 km with a stronger absolute value. The percent of the temperature enhancement linearly increases with heating power in all the heating case,and the increase velocity decreases with the pump frequency increase. A clear 2D distribution can be found in measurement on August 15,and the preponderant direction of heating effects is close to field-aligned. The heating effects are obviously affected by the angle between heating beams and field-aligned. With the increase of the angle,the increment of temperature decay.