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Analysis of Pc3 observational data along the210° magnetic meridian showed a complicated frequency-latitude structure atmiddle latitudes. The observed period-latitude distributions vary between eventswith a "noisy source": the D component has a colored-noise spectrum,while the spectrum of H component exhibits regular peaks that vary withlatitude, and events with a "band-limited source": the spectral powerdensity of the D component is enhanced at certain frequencies throughoutthe network. For most ULF events a local gap of the H component amplitudehas been exhibited at both conjugate stations at L ~ 2.1. Aquantitative interpretation has been given assuming that band-limited MHDemission from an extra-magnetospheric source is distorted by local field lineresonances. Resonant frequencies had been singled out with the use of theasymmetry between spectra of H and D components. Additionally, alocal resonant frequency at L ~ 1.6 was determined by thequasi-gradient method using the data from nearly conjugate stations. Theexperimentally determined local resonance frequencies agree satisfactorily withthose obtained from a numerical model of the Alfven resonator with theequatorial plasma density taken by extrapolation of Carpenter-Anderson model. Wedemonstrate how simple methods of hydromagnetic spectroscopy enable us tomonitor simultaneously both the magnitude of the IMF and the magnetosphericplasma density from ULF data. Key words. Magnetospheric physics(Magnetosphere-ionosphere interactions; MHD waves and instabilities;plasmasphere

Hydromagnetic spectroscopy of the magnetosphere with Pc3 geomagnetic pulsations along the 210° meridian