Penetration of the Earth's free oscillations at 54 minute period into the atmosphere

It is known that the fundamental spheroidal mode S-0(2) of the Earth free o scillation with a period of about 54 min forces atmospheric oscillations. W e present a certain phase relationship for components of the S-0(2) multipl et, which is based on synchronous collocated microbarograph and seismograph observations. This relationship is both the first observational manifestat ion of the Pekeris mode of global atmospheric oscillations with the 54 min period and a further proof of the Earth's S-o(2) mode penetrating into the atmosphere. We show that the linear non-dissipative model of steady forced oscillations in isothermal atmosphere at rest does not describe the penetra tion of the S-0(2) mode into the atmosphere adequately.