Pc5 pulsations are global magnetohydrodynamic events in the magnetosphere. This article details the analysis of Pc5 pulsation events observed by SuperDARN high-frequency radars within their field of view together with magnetometers. We believe that despite much theoretical knowledge, very few pulsation events observed by multiple radars have been reported in the literature to determine in detail the physical characteristics of Pc5 pulsation events by direct observation.

The method of electric field mapping along geomagnetic field lines, derived in an accompanying paper, is applied to the International Geomagnetic Reference Field. Formulae for the geomagnetic field gradient tensor are derived and these are used in a software package developed to map the electric field. A number of examples are presented illustrating the method. The method will be of importance in conjugate studies of ionospheric convection when the external magnetic field can be neglected.

The equation for conservation of wave action is explicitly derived for magnetohydrodynamic waves in a plasma that varies slowly in space and time. Together with generalized ray-tracing equations, it is equivalent to a WKBJ solution of the problem and allows the computation of energy exchange between wave and background plasma as well as the variation of the amplitudes of the field components along the ray. The method is illustrated by application to simple examples.