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The State Research Center of Russian Federation BUDKER INSTITUTE OF NUCLEAR PHYSICS P. Vorob'ev, V. Ianovski and I. Okunev INFLUENCE OF GEOMAGNETIC PERTURBATION ON RESONANT GRAVITATIONAL

The level of background signals in modern cryogenic resonant mass gravitational wave antenna is discussed caused by (a) the geomagnetic eld pulsations and (b) an atmosferic of very low frequency band, generated by a lightning ash. The analysis of our results show that the signals of this origin will generally exceed the signals from the gravitational wave sources. To suppress these artifacts in such gravitational antenna, it is necessary to use the magnetometer included as anti-coincidence protection and a system of magnetic screens.