1995 Volume 47 Issue 11 Pages 1043-1052
The outine of a new solar Flare-Monitoring-Telescope is given, which was built at the Hida Observatory of Faculty of Science, Kyoto University, in the first financial year of the Japan's STEP project. The telescope is unique among currently-operating solar flare-patrol-telescopes, because it can simultaneously observe five solar images, which are four full disc images in Hα center, Hα + 0.8 Å, Hα - 0.8 Å and continuum, and one solar limb image in Hα center. After its start of operation it was confirmed that this telescope system is very useful to study the dynamical features of Hα filament disappearance, because it can, for the first time, continuously record the full solar disc simultaneously in three wavelengths of the Hα line. Two typical examples of Hα filament disappearance observed with the telescope are demonstrated and are comparatively studied. It is found that the more dynamical and more energetic Hα filament eruption causes the larger enhancement of soft X-ray bright arcade structure observed with the Soft X-ray Telscope of Yohkoh.