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Analyzing the records of Advanced LIGO and Virgo gravitational observatories,we found a permanent time-domain asymmetry inherent only to the signals oftheir gravitational detectors. Experiments with different periodic signals,Gaussian and non-Gaussian noises, made it possible to conclude that the noiseof gravitational detectors is an unusual mixture of signals. We also developeda specialized Pearson correlation analyzer to detect gravitational-wave (GW)events. It turned out that the LIGO and Virgo detectors' output signals containa significant (-6dB) component demonstrating the properties of records ofconfirmed resolved GW events. It allows us to argue that the gravitationalbackground is largely due to the processes of stellar masses merging. Since thespecific signal is registered by the detectors continuously, we can considerthe sub-kilohertz band gravitational background field as discovered. Ouranalysis method also allows us to estimate the contribution of thegravitational background component to the total signal energy. With its help,it will be possible not only to provide the radio-frequency estimation of themagnitude of gravitational disturbances but also to obtain the GW backgroundsky map.

The stochastic gravitational-wave background exists permanently and demonstrates time-domain asymmetry