Mathematics – Logic
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmgp11c0281r&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #GP11C-0281
Mathematics
Logic
1513 Geomagnetic Excursions
Scientific paper
A sharp increase in the velocity of motion of the geomagnetic pole has recently been detected and at present it is equal to 40 km per year, whereas almost prior to the end of the last century the velocity was equal to about 10 km per year. Furthermore, during the last 150 years the magnitude of the Earth's dipole moment has noticeably reduced. Such changes in the dipole motion and in the dipole moment are likely to point to onset of the inversion of the geomagnetic field or geomagnetic excursion, when the north geomagnetic pole can pass into Southern Hemisphere during the short time and then comes back. It is known that inversions(excursions) of the geomafnetic field are accompanied by a 2-4 fold decrease in the geomagnetic dipole value. Such changes in the intensity and configuration of the geomagnetic field are supposed to lead to drastic ecological and climatic changes on the time scale of 100-200 years. We have analyzed the development of the "Etrussia-Sterno"geomagnetic excursion, which occured 2600-2800 years ago. This excursion has been detected in 15 sites of the Northern and Southern Hemispheres in palaeo-and archeomagnetic data. During the "Etrussia-Sterno" geomagnetic excursion the north geomagnetic pole moved during 100-200 years to the Southern Hemisphere and then back along approximately the Greenwich meridian and the intensity of the geomagnetic field decreased by a factor of 1.5. The development of the excursion was accompanied by considerable climatic and ecological changes of the global scale. It has been found that this excursion was characterized by considerable decrease in temperatures at high and middle latitudes of the Northern Hemisphere and also droughts at the African continent. A substantial change in the level of the Caspian Sea has also been reveald. The development of geomagnetic excursion essentially changes the distribution of energetic particle fluxes ( including cosmic rays) in the magnetosphere, the ionosphere and the atmosphere on global scale. Historical chronics poin to the development of coronal forms of aurora in the lower latirudes during time interval of the "Etrussia-Sterno"geomagnetic excursion. Redistribution of energetic particle fluxes during geomagnetic excursion produced more extensive radiation damage for geostationary satellites. Changes of the structure and intensity of cosmic ray fluxes in the atmosphere act on planetary atmospheric conditions and atmospheric circulation. The work was suppotred by RFBR ( grants 03-05-65063 and 03-04-48769)
Dergachev Valentin A.
Goos'kova E. G.
Raspopov Oleg M.
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