The paper deals with a circularly polarized electromagnetic wave propagating along a non-uniform magnetic field. A general wave equation describing the propagation of the wave is obtained, and by means of this equation the physical processes which occur when the wave frequency coincides with the cyclotron frequency and which lead to absorption of the oscillations are analysed. Corrections to the absorption coefficient to allow for the Doppler effect, particle acceleration and the non-linear character of the variatio n in an unperturbed magnetic field are found. It is shown that in calculating the coefficient of absorption use of the adiabatic wave equation leads to the same result as direct consideration of the resonance interaction.
本論文は、非一様磁場に沿って伝播する円偏波電磁波を扱う。この波の伝播を記述する一般波動方程式が導出され、この方程式を用いて、波の周波数がサイクロトロン周波数と一致する際に生じる物理過程と、それに伴う振動の吸収が解析される。ドップラー効果、粒子加速、および非摂動磁場における非線形性を考慮した吸収係数の補正が求められる。断熱波動方程式を用いた吸収係数の計算が、共鳴相互作用の直接的な考察と同一の結果を与えることが示される。