Solar magnetic cycle dependence in corotating modulation of galactic cosmic rays

Details Solar magnetic cycle dependence in corotating modulation of galactic cosmic rays Solar magnetic cycle dependence in corotating modulation of galactic cosmic rays

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ap%26ss.321..185g&link_type=abstract

Astrophysics and Space Science, Volume 321, Issue 3-4, pp. 185-195

Astronomy and Astrophysics

Astrophysics

Cosmic Rays, Solar Modulation, Solar Wind, Interplanetary Magnetic Field

Scientific paper

We study the temporal evolution of cosmic ray intensity during ˜27-day Carrington rotation periods applying the method of superposed epoch analysis. We discuss about the average oscillations in the galactic cosmic ray intensity, as observed by ground based neutron monitors, during the course of Carrington rotation in low solar activity conditions and in different polarity states of the heliosphere (A<0 and A>0). During minimum and decreasing phases in low solar activity conditions, we compare the oscillation in one polarity state with that observed in other polarity state in similar phases of solar activity. We find difference in the evolution and amplitude of ˜27-day variation during A<0 and A>0 epoch. We also compare the average variations in cosmic ray intensity with the simultaneous variations of solar wind parameters such as solar wind speed and interplanetary magnetic field strength. From the correlation analysis between the cosmic ray intensity and the solar wind speed during the course of Carrington rotation, we find that the correlation is stronger for A>0 than A<0.

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