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12 January 2018 Using local correlation tracking to recover solar spectral information from a slitless spectrograph
Hans T. Courrier, Charles C. Kankelborg
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Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 4, Issue 1, 018001 (January 2018). https://doi.org/10.1117/1.JATIS.4.1.018001
Abstract
The Multi-Order Solar EUV Spectrograph (MOSES) is a sounding rocket instrument that utilizes a concave spherical diffraction grating to form simultaneous images in the diffraction orders m=0, +1, and −1. MOSES is designed to capture high-resolution cotemporal spectral and spatial information of solar features over a large two-dimensional field of view. Our goal is to estimate the Doppler shift as a function of position for every MOSES exposure. Since the instrument is designed to operate without an entrance slit, this requires disentangling overlapping spectral and spatial information in the m=±1 images. Dispersion in these images leads to a field-dependent displacement that is proportional to Doppler shift. We identify these Doppler shift-induced displacements for the single bright emission line in the instrument passband by comparing images from each spectral order. We demonstrate the use of local correlation tracking as a means to quantify these differences between a pair of cotemporal image orders. The resulting vector displacement field is interpreted as a measurement of the Doppler shift. Since three image orders are available, we generate three Doppler maps from each exposure. These may be compared to produce an error estimate.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Hans T. Courrier and Charles C. Kankelborg "Using local correlation tracking to recover solar spectral information from a slitless spectrograph," Journal of Astronomical Telescopes, Instruments, and Systems 4(1), 018001 (12 January 2018). https://doi.org/10.1117/1.JATIS.4.1.018001
Received: 20 June 2017; Accepted: 13 December 2017; Published: 12 January 2018
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Cited by 4 scholarly publications.
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KEYWORDS
Doppler effect
Point spread functions
Spectrographs
Error analysis
Charge-coupled devices
Modulation transfer functions
Coronagraphy
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