The feature of optical fiber transmission system and its effect on the solar radio heliograph are analyzed in this article.
分析了光纤传输系统的特性，及其对太阳射电频谱日像仪的影响。
2
By using data of Nobeyama radio heliograph, we calculate value of magnetic field in lower corona in some active region from thermal bremsstrahlung, and preliminary result has been obtained.