Cosmic ray modulation and the solar magnetic field

Details Cosmic ray modulation and the solar magnetic field Cosmic ray modulation and the solar magnetic field

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..565c&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 5, p. 565-568

Astronomy and Astrophysics

Astrophysics

95

Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Solar Cycle Variations, Solar Physics, Astrophysics, And Astronomy: Magnetic Fields

Scientific paper

We show that the variations of the interplanetary magnetic field strength (B) over a 22-year period are tracked by the inverted profile of the cosmic ray density measured by neutron monitors. We suggest that global changes in the Sun's magnetic field are more important for longterm modulation than magnetic field enhancements resulting from the merging of high-speed flows and coronal mass ejections in the outer heliosphere. The unexpectedly close relationship that we find between the ``tilt angle'' of the heliospheric current sheet and the cosmic ray density away from solar minimum for both polarity states of the solar magnetic field may be accounted for by the anticorrelation between the cosmic ray density and field strength variations.

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