Variations in intensity of secondary cosmic radiation observed on 10-11 August 1981

Quasiperiodic pulsations of the charged and neutral components of secondary cosmic radiation were investigated during 1979 - 1981 during a series of flights of the Nataliya-1M gamma-telescope carried aloft on high-altitude balloons. The results of one such flight at latitude 46 deg N are discussed in detail. The fluxes of different cosmic radiation components were registered the four intensimeters in which information was accumulated for 2 seconds after each triggering of the gamma-telescope. Balloon measurements were made at an altitude of 35 km for 5 hours. The flight was made against the background of a magnetic storm recovery phase. The instrument was oriented to the zenith. The discrete Fourier analysis method was used in detection quasi-periodic pulsations of cosmic radiation particles. Quasiperiodic pulsations of fluxes of particles with periods 1.1 to 1.25, 1.4 to 1.5 and 11.3 minutes were detected. The period 11.3 minutes corresponds to pulsations of the proton component whereas the periods 1.1 to 1.5 minutes correspond to the electron component.