Local and Global Aspects of Galactic Cosmic Ray Modulation

Details Local and Global Aspects of Galactic Cosmic Ray Modulation Local and Global Aspects of Galactic Cosmic Ray Modulation

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh43a1098a&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH43A-1098

Physics

2104 Cosmic Rays, 2134 Interplanetary Magnetic Fields, 2162 Solar Cycle Variations (7536), 2164 Solar Wind Plasma, 2169 Sources Of The Solar Wind

Scientific paper

Galactic cosmic rays (GCR) are modulated by the solar wind in the heliosphere. A part of the modulation arises from local effects at earth's orbit due to the dynamics of the source regions of the interplanetary magnetic field and the solar wind while the rest of it arises from happenings in the outer heliosphere. The differences in the two kinds of contributions need to be clarified to understand the correlation between GCR modulation and the time variations of geomagnetic index Ap. We discuss our insights based on analyses of cosmic ray data obtained with the detectors on ground and on board the balloons and near earth satellites; they respond to a broad range of GCR spectrum at earth's orbit spanning rigidities of 1 GV to 100 GV. The physical significance of our findings will be discussed.

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