Variations in the Rate of 10BE, 14C and NO_3 Due to the Variable Vector Geomagnetic Dipole, 8000 BC 2000 AD

Details Variations in the Rate of 10BE, 14C and NO_3 Due to the Variable Vector Geomagnetic Dipole, 8000 BC 2000 AD Variations in the Rate of 10BE, 14C and NO_3 Due to the Variable Vector Geomagnetic Dipole, 8000 BC 2000 AD

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.4129m&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

1

Scientific paper

The 11 year variation in the production and precipitation of 10 Be at Dye 3 in Southern Greenland is investigated in detail, and shows that the 10 Be was produced at geomagnetic cutoffs < 1GV. Using this result, a mathematical model was developed that shows that the changes in direction, and intensity of the geomagnetic dipole since 1000AD have modulated the production of 10 Be by up to 4%. Analysis of the 10 Be data shows that the 11 year variation is well described by the force field modulation function, after allowance for century scale changes in the cosmic ray spectrum. Further, the changes in modulation function are shown to be a well defined function of sun spot number throughout the interval 1784-1976. In addition, it is shown that the well known 22 year variation due to drift effects in the heliomagnetic field can be identified in the 10 Be data. This shows that the 22 year oscillation in the sun's general field did not suffer a phase slip between the 19th and 20th century Gleissberg cycles. Overall, these results indicate that the 10 Be data will provide good estimates of sunspot number, and phase of the heliomagnetic field, far into the past.

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