Variations of the electromagnetic fields and ionospheric parameters in the Baikal Rift Zone |
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| Authors: | B G Gavrilov Yu I Zetzer V I Kurkin I E Markovich Yu V Poklad M Parrot I A Ryakhovskii V V Yakim |
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| Institution: | 1.Institute of Geosphere Dynamics,Russian Academy of Sciences,Moscow,Russia;2.Institute of Solar-Terrestrial Physics,Siberian Branch of the Russian Academy of Sciences,Irkutsk,Russia;3.Laboratoire de Physique et Chimie de l’Environnement et de l’Espace,Orl@eans,France |
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| Abstract: | Variations in the geomagnetic and electric fields and variations of the total electron content (TEC) of the ionosphere recorded
in the Baikal Rift Zone (BRZ) during the expeditions in 2009 and 2010 are analyzed. Synchronous bursts in the geomagnetic
field on the ground and in the ionosphere, which are caused by propagation of electromagnetic disturbances (spherics) generated
by the remote lightning discharges, are revealed. The analysis of the occurrence frequency of the electromagnetic disturbances
at an altitude of ∼700 km shows that there is a preferred region of predominant propagation of these disturbances from the
Earth-ionosphere waveguide to the upper ionosphere. When the ionospheric penetration point moves through this preferred region,
the frequency spectrum of TEC variations changes, and the northern boundary of the region of spectral alteration is located
at ∼54°N. The bursts in TEC that map on the zones of the main faults in the Tunka valley are identified. The results probably
suggest a relation between the electromagnetic phenomena in the ionosphere and the structures in the lithosphere. |
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