Using local correlation tracking to recover solar spectral information from a slitless spectrograph
|Courrier, Hans T.
|Kankelborg, Charles C.
|Courrier, Hans T., and Charles C. Kankelborg. "Using local correlation tracking to recover solar spectral information from a slitless spectrograph." 4, no. 1 (January 2018). DOI:10.1117/1.JATIS.4.1.018001.
|The Multi-Order Solar EUV Spectrograph (MOSES) is a sounding rocket instrument that utilizes a concave spherical diffraction rating 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=Â±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.
|NASA Heliophysics Sounding Rocket Program, Grant No. NNX14AK71G
|CC BY: This license lets you distribute, remix, tweak, and build upon this work, even commercially, as long as you credit the original creator for this work. This is the most accommodating of licenses offered. Recommended for maximum dissemination and use
|Using local correlation tracking to recover solar spectral information from a slitless spectrograph
|Journal of Astronomical Telescopes, Instruments, and Systems
|Physics & Mathematics
|College of Letters & Science
|Montana State University - Bozeman
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