Deconvolution of Spatial and Spectral Information in Slitless Spectrometer Images

Astronomy and Astrophysics – Astronomy

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Scientific paper

Observation of coronal emission has greatly enhanced our understanding of the solar corona. However, to date solar scientists have been forced to choose between the large fields of view offered by imaging telescopes and the detailed spectral information offered by imaging spectrometers. In order to measure spectral characteristics over large portions of the corona, imaging spectrometers must raster over the area, a time-consuming process that lowers the effective time cadence of the resulting observations and causes confusion between spatial and temporal variation. Slitless spectrometers, which produce images with convolved spatial and spectral information from a relatively large field of view, offer the opportunity to study the emission line profiles of large regions of the corona without rastering, if the spatial and spectral information can be reliably deconvolved. Here we present a study of the potential capabilities of such an instrument, including examples showing deconvolution of artificial slitless spectrometer images based on Hinode EIS spectral measurements. We compare the expected accuracy of intensities, linewidths, and doppler shifts measured using our deconvolution technique to those derived from fitting of EIS spectral data.

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