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Calibration of Herschel SPIRE FTS observations at different spectral resolutions

The SPIRE Fourier Transform Spectrometer on-board the Herschel Space Observatory had 
two standard spectral resolution modes for science observations: high resolution (HR) and low 
resolution (LR), which could also be performed in sequence (H+LR). A comparison of the HR 
and LR resolution spectra taken in this sequential mode revealed a systematic discrepancy in 
the continuum level. Analysing the data at different stages during standard pipeline processing 
demonstrates that the telescope and instrument emission affect HR and H+LR observations 
in a systematically different way. The origin of this difference is found to lie in the variation 
of both the telescope and instrument response functions, while it is triggered by fast variation 
of the instrument temperatures. As it is not possible to trace the evolution of the response 
functions using housekeeping data from the instrument subsystems, the calibration cannot be 
corrected analytically. Therefore, an empirical correction for LR spectra has been developed, 
which removes the systematic noise introduced by the variation of the response functions.