Nature of dynamics of cosmic ray fluctuation spectrum

The nature of dynamics of cosmic ray (CR) fluctuation spectrum is discussed. The spectrum of CR fluctuations in certain periods undergoes considerable changes. The reconstruction of the CR fluctuation spectrum observed is caused by the appearance of fast magnetoacoustic waves of noticeable intensity. There are all grounds to suppose that the generation of these waves is caused locally by the fluxes of particles of superthermal energies >or approx. 10 keV. These particles can be of dual origin: they are either solar wind particles accelerated in the interplanetary space at the shock wave front, for example, or solar CR. Within the framework of these data the connection of CR fluctuation spectrum reconstruction with interplanetary shock waves observed is quite natural. As shock-wave accelerated particles considerably overtake the shock front, as a rule, the reconstruction can start long before the moment of shock wave coming to the Earth's orbit