Norikura Observatory 10cm New Coronagraph

The 10cm-aperture 'new' coronagraph was built in 1990 and mounted next to the original 10cm coronagraph. With a CCD camera and an image processing unit, this instrument can perform high sensitivity photometric measurements of the solar corona. The observing wavelengths can be selected by four filters. In an observation of the so-called coronal condensation in continuum light, we were able to deduce the temperature and the thickness of the region by combining X-ray observation with Yohkoh.

References

K.Ichimoto et al.: "Effective Geometrical Thickness and Electron Density of a Flare of 1991 December 2 Observed with the Soft X-Ray Telescope of Yohkoh and Coronagraph", Publ. Astron. Soc. Japan, 44, L117-L122, 1992

K.Ichimoto et al.: "Optical and X-ray Observations of the X9 Flare on 2nd Nov. 1992", Proc. Second Japan-China Seminar on Solar Physics, eds. T.Sakurai, T.Hirayama, and G.Ai, National Astronomical Observatory of Japan, pp.151-156, 1994