Solar-cycle dependence of galactic cosmic ray flux |
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| Authors: | G D Parker R L Chasson R T Hansen S F Hansen |
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| Institution: | (1) Department of Physics, University of Denver, 80210 Denver, Colo., U.S.A.;(2) High Altitude Observatory of the National Center for Atmospheric Research, 80303 Boulder, Colo., U.S.A. |
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| Abstract: | To investigate the relationship between solar activity and cosmic ray modulation, time series of the nucleonic flux and of solar plages, sunspots, centimeter radio noise, and the brightness of the white light corona at 1.1 and 1.5 solar radii from the center of Sun are cross-correlated. Data pertain to the years 1964–1967 during the ascending phase of the current solar cycle. The amplitudes and phases of correlation functions for filtered and unfiltered indices are discussed. The existence of a superior solar index for relating solar activity to long-term modulation is not yet demonstrated conclusively, and the time lag of modulation is too poorly determined to permit its use in estimating the radius of the modulation region.Presently at the Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona 85721.The National Center for Atmospheric Research is sponsored by the National Science Foundation. |
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