论文标题
在气星步道形成中头部回声的频移
Frequency shifts of head echos in meteoroid trail formation
论文作者
论文摘要
得出了雷达回波的近似频移。通过考虑示意图模型，讨论了在跟踪形成过程中观察到的头部回声的起源。回声是来自Meteoroid Trail中热型电子的雷达信号的反射，或者是与Meteoroid本身共同移动的等离子体电子。结果表明，在这些相反的模型中，相对于雷达发射极频率相对于雷达发射器频率的频移也必须是相同的，即使基础物理学有所不同。进行了计算，使回声频率随时间的函数，从而可以与观测值进行定性比较。一些典型的观察结果表明，在正向散射中，头部响应着显着的频移。提出的论点是，这可以对应于前面的共同移动血浆的酿酒素。
The approximate frequency shift of a radar echo from a meteoroid is derived. The origin of head echos observed during trail formation are discussed by considering schematic models. The echo is either a reflection of the radar signal from thermalized electrons in the meteoroid trail or from the plasma electrons co-moving with the meteoroid itself. It is shown that in these opposite models the frequency shifts of the echo relative to the radar emitter frequency must be identical, even though the underlying physics differs. Calculations were made that give the echo frequency as function of time, allowing qualitative comparison with observations. Some typical observations show a conspicuous absence of negative frequency shifts in the head echo in forward scattering. Arguments are given that this can correspond to meteoroids with the co-moving plasma in front.
