A New Imaging System of the Corona at Norikura
| Autor: | Kiyoshi Ichimoto, Kazuya Shinoda, Tetsuo Nishino, Kazuyoshi Kumagai, Takashi Sakurai, Motokazu Noguchi, Norihide Takeyama, Nobuyuki Tanaka, Takeo Fukuda |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Physics
Solar observatory business.industry media_common.quotation_subject Astrophysics::Instrumentation and Methods for Astrophysics Astronomy and Astrophysics Plasma Lyot filter law.invention symbols.namesake Wavelength Optics Space and Planetary Science law Sky Transmission curve Physics::Space Physics symbols Astrophysics::Solar and Stellar Astrophysics business Coronagraph Doppler effect media_common |
| Zdroj: | Publications of the Astronomical Society of Japan. 51:383-391 |
| ISSN: | 2053-051X 0004-6264 |
| Popis: | A new imaging system of the coronal green line (Fe XIV 5303 A) 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 10~6/® 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. |
| Databáze: | OpenAIRE |
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