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Contribution of geometry of interaction between interplanetary and terrestrial magnetic fields into geomagnetic activity

Published online by Cambridge University Press:  01 November 2006

T. V. Kuznetsova
Affiliation:
IZMIRAN, Russian Academy of Sciences, Moscow region, Troitsk, 142190, Russia email: tvkuz@izmiran.ru
A. I. Laptukhov
Affiliation:
IZMIRAN, Russian Academy of Sciences, Moscow region, Troitsk, 142190, Russia email: tvkuz@izmiran.ru
V. D. Kuznetsov
Affiliation:
IZMIRAN, Russian Academy of Sciences, Moscow region, Troitsk, 142190, Russia email: tvkuz@izmiran.ru
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Abstract

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We present results of our study of dependence of planetary geomagnetic activity from geometric factors in geoeffective parameters taking into account orientation of the geomagnetic moment M relative to the vectors of the Interplanetary Magnetic Field (IMF) and electric field of the solar wind E during annual and daily motions of the Earth. We take as our data base space measurements of the IMF and solar wind velocity at the Earth's orbit for 1964-1998 and Kp, Dst indices. Variations of the geometric factors determined by mutual orientation of the vectors E and M can explain 50% of observed variations of Kp and 75% of Dst. We show that geomagnetic activity can reach very high levels of geomagnetic activity Kp = 8 for invariable values of the solar wind electric field by changing only geometric factors.

Type
Contributed Papers
Copyright
© 2006 International Astronomical Union