Energetics of terrestrial and Jovian magnetospheres

Energy supply rates to magnetospheres of Earth and Jupiter are estimated on the basis of most recent information on controlling parameters, and these are compared with energy consumption rates inside respective magnetospheres. Dominant role played by the reconnection process is suggested, but the high ejection rate of energetic electrons from the Jovian magnetosphere reported by Conlon (1978) might suggest the importance of the planetary rotation as the energy source. (Auth.)