Orateur
Description
The QUIJOTE MFI instrument (2012-2018) observed the sky at four
frequency bands, 11, 13, 17, and 19 GHz, at 1 degree angular resolution.
For ground-based Cosmic Microwave Background experiments like QUIJOTE,
the atmosphere is a major source of contamination in the data. Using the
entire database of MFI wide-survey observations (2013-2018), we
characterized the correlation properties of the atmospheric signal in
those frequency bands. This analysis involved performing the
cross-correlation function of time-ordered data (TOD) between the
signals of QUIJOTE’s horn measuring at the same frequency. We found
that the atmosphere stays stable for a period of around 2 to 3 hours.
Moreover, we investigated the cross-power spectrum of atmospheric
signals at 17, 19, 30, and 40 GHz, and we characterized their scale
dependence. This information will help improve the current sky models at
these frequencies. It could also be used in further MFI reanalyses or
to prepare future observations at these frequencies (e.g., the new
QUIJOTE MFI2 instrument, or the Tenerife Microwave Spectrometer).
