Multiwavelength high-speed video spectroheliograph

Yoichiro Hanaoka

doi:10.1117/12.460280

11 February 2003 Multi-Wavelength, High-Speed Video Spectroheliograph

Yoichiro Hanaoka

Proceedings Volume 4853, Innovative Telescopes and Instrumentation for Solar Astrophysics; (2003) https://doi.org/10.1117/12.460280
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

A high-speed video spectroheliograph was developed for imaging spectroscopy observations in multi-wavelength bands. It is attached to the focal plane of the spectrograph of the 60 cm Domeless Solar Telescope at Hida Observatory, Kyoto University. Although to take spectroheliograms needs some time to scan the solar image on the slit, a spectroheliograph gets spectral information co-temporally without suffering image blurrings by the seeing effect. Therefore, a spectroheliograph is suitable to obtain a data cube (spatial 2-D + spectral 1-D) for quantitative spectral analyses such as velocity field calculations. In our spectroheliograph system, up to three CCD video cameras can be attached to the spectrograph, and we can simultaneously observe up to three wavelength bands, for example, Ca II K/G-band/Hα,with three CCD video cameras, owing to the wide wavelength coverage of the spectrograph. Therefore, heliograms at different heights in the solar atmosphere can be obtained simultaneously. Images from the cameras are digitized by a frame grabber to 512 (4.3' along the slit) pixels × 256 (along the dispersion, typically 24 Å wide) lines and processed by a PC with a frame rate of 30 frames s^-1. Therefore, it takes only 17 s to obtain a set of 512 × 512 pixel heliograms, which cover the field of view of 4.3'×4.3'.

Citation Download Citation

Yoichiro Hanaoka "Multi-Wavelength, High-Speed Video Spectroheliograph", Proc. SPIE 4853, Innovative Telescopes and Instrumentation for Solar Astrophysics, (11 February 2003); https://doi.org/10.1117/12.460280

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