Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7115
Title: Fabry-Perot based narrow band imager for solar filament observations
Authors: Sajal Kumar Dhara
Ravindra, B
Banyal, R. K
Keywords: Instrumentation: interferometers
Instrumentation: spectrographs
Methods: observational
Sun: chromosphere
Sun: filaments/prominences
Issue Date: Jan-2016
Publisher: IOP Publishing
Citation: Research in Astronomy and Astrophysics, Vol. 16, No. 1, 10
Abstract: We have recently developed a narrow band imager (NBI) using a n air gap based Fabry-P ́erot (FP) interferometer at the Indian Institute of Astrophysic s, 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 b y 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 filam ent in the H α wavelength. The instrument is being used to image the Sun at chromospheri c height and it is also able to scan the H α 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 a t ± 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 o bservations carried out with this instrument.
Description: Restricted Access © IOP Publishing http://dx.doi.org/10.1088/1674-4527/16/1/010
URI: http://prints.iiap.res.in/handle/2248/7115
ISSN: 1674-4527
Appears in Collections:IIAP Publications

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