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Paper: The Herschel/SPIRE Spectrometer Deglitching/Clipping Tasks and Statistical Analysis
Volume: 461, Astronomical Data Analysis Software and Systems XXI
Page: 749
Authors: LeLeu, G.; Méalier, A.-L.; Benielli, D.; Baluteau, J.-P.; Surace, C.; Fulton, T. R.; Imhof, P.; Polehampton, E.; Vibert, D.
Abstract: The Herschel Space Observatory is a cornerstone mission of the European Space Agency for astronomical observations in the far-infrared and sub-millimeter wavelength range (60 – 670 microns) and has been launched in May 2009 with three instruments onboard : SPIRE, PACS, HIFI. This paper focuses on the development and the statistical analysis of two phenomena treated by the pipeline through both tasks ClippingCorrection and Deglitching. Glitches have to be re-moved to avoid the introduction of unwanted artefacts in the spectral energy distribution across all wavelengths. Clipped signals in the time-line are problematic as they represent missed samples. If left uncorrected, missed or erroneous samples can lead to further difficulties in particular when the time-lines are converted into spectra. This paper describes the new reconstructed method based on an adaptive algorithm using wavelet decomposition parameters. We also present statistic tool to analyze clipping and deglitching phenomena. The tool shows ratios and indicators that are calculated and plotted allowing visual monitoring. The various aggregated values give a synthetic graphical representation of the quality of the observation including Instrument and Telescope Temperatures behaviours. This tool has been developed as a plug-in of the HIPE environment.
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