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 w as built at the Hida Observatory of Faculty of Science, Kyoto Universi ty, in the first financial year of the Japan's STEP project. The teles cope is unique among currently-operating solar flare-patrol-telescopes , because it can simultaneously observe five solar images, which are f our full disc images in H alpha center, H alpha + 0.8 Angstrom, H alph a - 0.8 Angstrom and continuum, and one solar limb image in H alpha ce nter. After its start of operation it was confirmed that this telescop e system is very useful to study the dynamical features of H alpha fil ament 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 o bserved with the telescope are demonstrated and are comparatively stud ied. It is found that the more dynamical and more energetic H alpha fi lament eruption causes the larger enhancement of soft X-ray bright arc ade structure observed with the Soft X-ray Telscope of Yohkoh.