Rigidity dependence of 11 year cosmic ray modulation: Implication for theories

Details Rigidity dependence of 11 year cosmic ray modulation: Implication for theories Rigidity dependence of 11 year cosmic ray modulation: Implication for theories

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11507101a&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A7, CiteID A07101

Astronomy and Astrophysics

Astrophysics

4

Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Solar Cycle Variations (7536), Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections (2101), Space Weather: Space Radiation Environment

Scientific paper

We use data obtained with the global network of detectors, with median rigidity (Rm) of response covering a wide range (1 to 200 GV), to derive the rigidity dependence of the 11 year modulation of galactic cosmic rays (GCR) for 4 sunspot cycles (20 to 23). We find that observed rigidity dependence is represented by a power law with negative exponents; the exponents do not depend on the solar magnetic polarity. However, the dependence on GCR rigidity is significantly flatter than is expected from the Quasi-linear Theory of modulation formulated by Jokipii.

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