Geomagnetism and climate V: general conclusions

Details Geomagnetism and climate V: general conclusions Geomagnetism and climate V: general conclusions

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....10168m&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #10168

Physics

Scientific paper

The shielding capacity of the Earth’s geomagnetic field is a prime factor regulating the flux into the atmosphere of galactic cosmic ray (in its turn controlling the 14C and 10Be production). This shielding capacity is controlled both by the Earth’s own geomagnetic field variability and by the Solar Wind variations. The Solar Wind interaction with the magnetosphere also affects the Earth’s rate of rotation (as recorded in the correlation between LOD and Sunspot activity). This opens for three possible lines of Solar Terrestrial interaction. (1) Changes in the total irradiance (known to be very small, however, over a full sun spot cycle). (2) Changes in cosmic ray flux reaching into the Earth’s atmosphere where it has the potential of affecting airglow and cloudiness (especially the cloudiness at a height in the order of 15 km). (3) Changes in the Earth’s rate of rotation affecting the oceanic circulation redistributing ocean-stored heat and water masses. The Spörer, Maunder and Dalton sun spot minima seem all to have led to periods of rotational acceleration pulling Arctic water down the European coasts and displacing the warm Gulf Stream towards Gibraltar. The geomagnetic field as regulator of cosmic ray flux and rotational potential is likely to have played a significant role even over longer time periods. It should be noted, however, the geometry of the Earth’s geomagnetic field cannot have differed very much due to frozen plasma conditions even at excursions and reversals. If the recorded sunspot and geomagnetic cycles are extrapolated into the future they predict a new low (“Little Ice Age”) in the years 2050 2100 (i.e. a scenario very different from that presented by IPCC). Our study of the relation between geomagnetism and climate has shown that geomagnetic field changes have played an important role in modulation Earth’s climate. These changes may originate from internal planetary sources (i.e. the Earth’s own geomagnetic field) as well as from external Solar variability (i.e. heliomagnetic field and Solar Wind forces). This applies, in different ways, for the present, the last 400 years, the last millennium, the last 15,000 years and the last 1 million years. Therefore, it must also be included in estimates and predictions of future changes in climate. The full INTAS team consists of: N.-A. Mörner, H. Nevanlinna, N. Abrahamsen, V. Dergachev, O. Shumilov, O. Raspopov, A. Didenko, O. Pilipenko, Z. Charonova, V. Trubikhin, E. Gooskova, S. Vasiliev, E. Kasatkina, I. Kirtsidele.

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