  The QUIJOTE MFI instrument (2012-2018) observed the sky at four frequency
bands, namely 11, 13, 17 and 19GHz, at 1 degree angular resolution. Using
around 10000 h of observations in the so-called nominal mode, QUIJOTE MFI
produced sky maps covering approximately 29000 deg2. Here we use the full
database of MFI wide survey observations to characterize the correlation
properties of the atmospheric signal in those frequency bands. This information
will be useful to improve the current sky models at these frequencies, and
could be used in further MFI reanalyses, or for the preparation of future
observations at these frequencies (e.g., MFI2 and the Tenerife Microwave
Spectrometer).
