Long-Term Decline of South Pole Neutron Rate

Details Long-Term Decline of South Pole Neutron Rate Long-Term Decline of South Pole Neutron Rate

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh21b0113b&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH21B-0113

Other

1650 Solar Variability, 2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514), 7536 Solar Activity Cycle (2162)

Scientific paper

The count rate recorded by a neutron monitor at South Pole, Antarctica displays a long-term decline over the 22-year span from 1965 to 1987. The neutron rate follows an 11-year cycle with maxima at times of low solar activity, but the 1987 peak rate was approximately 9% lower than the 1965 peak rate based on 27-day averages. This change is much larger than that recorded by any other neutron monitor. We suggest that the South Pole monitor, owing to its unique position at both high latitude and high altitude (2820 m), has enhanced sensitivity at ˜1-2 GV relative to a sea level monitor and may be responding to a change in the intensity of primary cosmic rays in this rigidity region. Measurements of cosmic rays made aboard stratospheric balloons and on the IMP 8 spacecraft support the possibility of a long-term change in cosmic ray intensity. This work was supported by NSF grant ATM-0000315.

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