Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh11a0377a&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH11A-0377
Physics
2104 Cosmic Rays, 2134 Interplanetary Magnetic Fields, 2162 Solar Cycle Variations (7536), 2164 Solar Wind Plasma, 2722 Forecasting
Scientific paper
A recent analysis of the annual mean hourly data for the solar wind speed, the interplanetary magnetic field intensity at the earth's orbit, and the neutron monitor rates for 1964-1998, indicates that galactic cosmic ray modulations observed at the high rigidities are mainly caused by their convective removal from the inner heliosphere by the solar wind. We are now able to explain why several different research groups (including this author), all over the world, have reported a strong correlation between the observed modulations of the galactic cosmic rays and interplanetary magnetic field intensity B. These correlations span a large range of time scales, such as: 11 years, 27 days, Forbush decreases, and steady state diurnal variations. We are also able to explain why there is a relationship between the temporal variations of the planetary indices (Kp, Ap, aa) and the long term modulation of galactic cosmic rays. However, several glitches remain to be resolved and many important questions need answers. We shall discuss the physical significance of our results and delineate their implications for the space weather forecasting.
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