Fabry-Prot based narrow band imager for solar filament observations

作     者：Sajal Kumar Dhara Belur Ravindra Ravinder Kumar Banyal 

作者机构：Indian Institute of Astrophysics Bangalore-560034 India 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2016年第16卷第1期

页      面：79-88页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 070401[理学-天体物理] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 

主　　题：instrumentation: interferometers    instrumentation: spectrographs    methods: observational   Sun: chromosphere    Sun: filaments/prominences 

摘      要：We have recently developed a narrow band imager（NBI） using an air gap based Fabry-P′erot（FP） interferometer at the Indian Institute of Astrophysics, Bangalore. Narrow band imaging is achieved by using an FP interferometer working in combination with an order sorting pre-filter. The NBI can be tuned to a different wavelength position on the line profile by changing the plate separation of the FP. The interferometer has a 50 mm clear aperture with a bandpass of ～247.8 m ？A and a free spectral range of～5.3 ？A at λ = 656.3 nm. The developed NBI is used to observe the solar filament in the Hα *** instrument is being used to image the Sun at chromospheric height and it is also able to scan the Hα spectral line profile at different wavelength positions. We have also made Doppler velocity maps at chromospheric height by taking the blue and red wing images at ±176 m ？A wavelength positions separately away from the line center of the spectral line. In this paper, we present a description of the NBI including lab test results of individual components and some initial observations carried out with this instrument.