Speaker
Description
Sos Enattos in Sardinia (Italy) is a leading candidate site for the Einstein Telescope (ET), a next-generation underground gravitational wave observatory. We report recent results from an environmental magnetic noise study, with the aim of quantifying natural noise sources in the low-frequency band relevant to the ET-LF interferometer. Using a network of magnetometers deployed at Sos Enattos we measured the magnetic noise below 10 Hz and asses its temporal variability. The focus is the site response to space weather: we analyse the signatures of major solar-flare-driven geomagnetic disturbances in the local field and quantify their impact using band-limited RMS metrics. We present a comparison with other magnetometer networks as reference stations. For the Sos Enattos site alone, we extend the analysis across a wider frequency range up to 10 Hz, enabling assessment of higher-frequency magnetic noise relevant to detector subsystems. These results reinforce Sos Enattos' suitability for ET and provide a baseline for infrastructure planning and mitigation. Ongoing work will expand to seasonal variability and rare transients, incorporating meteorological, marine, and anthropogenic indicators to identify dominant sources of noise modulation.