Giant Pg pulsations in latitude profile of observatories

It is determined, that Pc 4 range geomagnetic pulsations, in which spectrum in D-component there are both higher and lower components along with harmonic coinciding with Pg main frequency, are observed during generations of 'giant geomagnetic pulsations' (Pg) in auroral latitudes within the same longitudinal range at middle and subauroral latitudes. Possible relation of Pc 4 excitation inside plasmosphere with Pg generation caused, probably, by occurrence of very space localized longitudinal current behind the plasmapause is discussed