A New Imaging System of the Corona at Norikura

Details A New Imaging System of the Corona at Norikura A New Imaging System of the Corona at Norikura

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..383i&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.383-391.

Astronomy and Astrophysics

Astronomy

13

Instruments: Coronagraph, Sun: Corona, Sun: Spectra

Scientific paper

A new imaging system of the coronal green line (Fe XIV 5303 Angstroms) was constructed at the Norikura Solar Observatory. The system consists of a 10-cm coronagraph, a tunable Lyot filter, and a cooled CCD camera. The transmission curve of the Lyot filter can be modulated by two liquid-crystal variable retarders. This scheme provides quick wavelength tuning and efficient subtraction of sky background. Two-dimensional distributions of the intensity and Doppler shift of the coronal green line can be obtained within 30 seconds with accuracies of better than 10-6I_Solar and 1 km s-1. Regular operation was started in 1997 September. The aim of the new system is to investigate plasma motions associated with the magnetic field reconnection and waves in the solar corona.

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