A study of the modulating effect of solar flares on the cosmic ray intensity using time series analysis

Physics

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Solar Activity Effects, Solar Cosmic Rays, Solar Flares, Autocorrelation, Cross Correlation, Modulation, Secular Variations, Sunspots, Time Series Analysis

Scientific paper

The cosmic ray 11-year variation for solar cycle 20 is attributed to the modulating effect of solar flare-induced shocks propagating through the interplanetary medium to the boundary of the heliosphere. The relative influence of these disturbances upon the cosmic ray intensity as a function of their travel time from the Sun is determined by a deconvolution of a linear system with the number of solar flares (importance ≥ 1) and the observed cosmic ray intensity as the input and output respectively of this system. The "impulse response function" so determined indicates that the solar flare-induced disturbances significantly modulate cosmic rays out to a distance of 70-90 AU where the modulating effect of the disturbances abruptly ends. This is interpreted as the boundary of the heliosphere.

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