HR: 1340h
AN: SM43D-1622    [Abstracts]
TI: Geomagnetic Activity and Eclipse Coronae
AU: * Ponyavin, D
EM: dponyavin@mail.ru
AF: Dmitri Ponyavin, Institute of Physics, University of St.Petersburg, (dponyavin@mail.ru), Saint Petersburg, 198504, Russian Federation
AB: Geomagnetic proxies (presented by various geomagnetic indices) are analyzed during the periods close to the total solar eclipses in the past. Geomagnetic variations are traces of the solar wind and interplanetary magnetic field, and of the topological evolution of large-scale magnetic fields on the Sun. We have considered historical coronal drawings in the relation to the phase of geomagnetic and sunspot cycles. It is established a coronal shape of "maximum" and "minimum" geomagnetic types. Any significant long-term trends are not detected in the changing of coronal structures. We suggest that secular increasing of AA geomagnetic indices is mainly due to the internal geomagnetic variability but it is not a response to external solar forcing.
DE: 2134 Interplanetary magnetic fields
DE: 7509 Corona
DE: 7524 Magnetic fields
DE: 7974 Solar effects
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting