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29 March 2024
 
  » arxiv » 1512.6512

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Fabry-P'erot based Narrow Band Imager for Solar Filament Observations
Sajal Kumar Dhara ; B. Ravindra ; Ravinder Kumar Banyal ;
Date 21 Dec 2015
AbstractWe 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 $sim$247.8 mAA and a free spectral range of $sim$5.3AA at $lambda$ = 656.3 nm. The developed NBI is used to observe the solar filament in the H$alpha$ wavelength. The instrument is being used to image the Sun at chromospheric height and it is also able to scan the H$alpha$ 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 $pm$176 mAA 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.
Source arXiv, 1512.6512
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