Status Of Galactic Cosmic Ray Recovery From Sunspot Cycle 23 Modulation

Astronomy and Astrophysics – Astronomy

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Sunspots, Galactic Cosmic Rays, Solar Magnetism, Astronomical Observations, Interplanetary Magnetic Fields, Sun Spots, Solar Cycles, Cosmic Rays, Electric And Magnetic Fields, Solar Magnetism, Observatories And Site Testing, Interplanetary Magnetic Fields

Scientific paper

Sunspot cycle 23 is turning out to be longer than cycle 20. Magnetic field measurements at Wilcox Solar Observatory indicate that solar polar field strength for cycle 23 is ~50% lower than for previous three sunspot cycles; the flux of the open magnetic field lines at earth orbit is at its lowest level since in situ measurements began in 1963. During the recovery phase of cycle 23 the structure of the heliosphere is significantly different from that observed for cycles 21 and 22; heliospheric current sheet has not flattened yet. Not surprisingly, we find that galactic cosmic ray recovery at earth orbit has reached the highest level ever observed, since continuous monitoring began by global network of neutron monitors in 1951. We show that neutron monitor rate increases for 2006-2009 are linearly correlated with the monotonic decrease in magnetic intensity at earth orbit. We conclude that normal physical processes are operative in the heliosphere during this time period.

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