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Poynting vectors of Pc 5 pulsations observed in the dayside outer magnetosphere are examined with the mag- netic and electric field data simultaneously observed by the GEOTAIL satellite. Poynting energy can be estimated as about 10−8-10−6 W/m2 in both directions across and along the magnetic field-line. However, the energy propa- gating across the magnetic field-line is larger than the energy propagating along the magnetic field-line. From this result we can estimate the Pc 5 wave energy flowing into the inner magnetosphere during an hour as 10 10-1013 J, which is one or two orders less than the substorm energy (about 1014-1015 J). However, by taking into account of the continuous activation of Pc 5 pulsations in the outer magnetosphere, Pc 5 waves should play an important role for energetics in the magnetosphere.

Poynting vectors of Pc 5 pulsations observed by the GEOTAIL satellite in the dayside outer magnetosphere