Observations of solar H alpha filament disappearances with a new solar flare-monitoring telescope at Hida Observatory

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 H alpha center, H alpha + 0.8 Angstrom, H alpha - 0.8 Angstrom and continuum, and one solar limb image in H alpha center. After its start of operation it was confirmed that this telescope system is very useful to study the dynamical features of H alpha filament disappearance, because it can, for the first time, continuously record the full solar disc simultaneously in three wavelengths of the H alpha line. Two typical examples of H alpha filament disappearance observed with the telescope are demonstrated and are comparatively studied. It is found that the more dynamical and more energetic H alpha filament eruption causes the larger enhancement of soft X-ray bright arcade structure observed with the Soft X-ray Telscope of Yohkoh.