25cm Coronagraph

[25cm Coronagraph]
The 25cm-aperture coronagraph, the spectrograph, and the 12m dome were built in 1971. This telescope uses a coude system, and the solar beam is led through the polar axis to the spectrograph room. With a grating of 40cm width, we can perform high dispersion (roughly 0.2 Angstrom/mm) spectroscopic observations. The telescope is now equipped with a cooled CCD camera and a universal polarimeter, providing a very convenient observing environment. The telescope time is open to outside users. During the period of 1991-1998, a routine mapping of the full disk has been carried out by using a spectral line of helium at a wavelength of 10830 Angstrom.