A Study of Jupiter's Decametric Radio Source by using Next Generation VLBI System

木星十米射电发射的频率-时间动态谱在几个不同的时间尺度上显示出复杂的结构。在几十秒的时间尺度上的特征光谱模式之一是Riihimaa在1968年发现的调制通道。我们为它们的产生机制开发了一个模型，其中的自由参数可以被调整，以提供与观测结果非常接近的拟合。访问数/每百万人：Reach for[Imai，et.等，1992a、1992b、1997、2002]。这种调制通道方法可以成为遥感木星射电源空间信息的非常有力的工具。为了研究木星射电源的精细结构，我们提出了一种新的具有同步调制通道观测的木星射电VLSI。我们的用于木星无线电的互联网VLBI系统通过使用下一代互联网实验网络JGN2，使实时VLBI观测成为可能。VLBI系统由VLBI采集板和GPS系统锁定的10 MHz RB振荡器等服务器组成。木星无线电信号在26~28 MHz的频率范围内被滤波，并采用高阶采样技术进行数字化，无需进行频率变换。我们已经开发并测试了这一新的VLBI系统，用于研究木星十米射电源的精细结构。

Frequency-time dynamic spectra of Jupiter's decametric radio emission display a complex structure on several different time scales. One of the characteristic spectral patterns on a time scale of a few tens of seconds is the modulation lanes discovered by Riihimaa in 1968. We developed a model for the mechanism responsible for their production in which the free parameters can be adjusted to provide a very close fit with the observations. [Imai, et. al., 1992a, 1992b, 1997, 2002]. This modulation lane method can be very powerful tool for the remote sensing of the spatial information of the Jupiter's radio sources. We proposed the new Jupiter radio VLSI with the simultaneous modulation lane observations to study the fine structure of Jupiter's radio sources. Our VLBI system over the Internet for the Jupiter radio makes VLBI observation possible in real time by using JGN2, which is a next-generation experimental network on the Internet. The VLBI system consists of the servers including the VLBI sampler board, and 10MHz Rb Oscillators locked by GPS system. The signal of Jupiter radio is filtered by the frequency range from 26 to 28MHz and digitized by using high order sampling technique without frequency conversion. We have developed and tested this new VLBI system for the investigation of the fine structures of Jupiter's decametric radio sources.