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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 | Abstract: | 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 $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 | Services: | Forum | Review | PDF | Favorites |
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