Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sunge...1b..25a&link_type=abstract
Sun and Geosphere, vol.1, no.2, p. 25-27
Physics
Scientific paper
Results of theoretical investigation of the dynamics of generation and propagation of planetary (with wavelengths 103 km and more) weather-forming Ultra-Low Frequency (ULF) electromagnetic wave structures in the dissipative ionosphere are given in this paper. It is established that the global factor, acting permanently in the ionosphere spatial inhomogeneity and curvature of the geomagnetic field and inhomogeneity of angular velocity of the Earth's rotation generates the fast and slow planetary ULF electromagnetic waves. The waves propagate along the parallels to the east as well as to the west. In the E-region the fast waves have phase velocities of (2-20) km/s-1 and frequencies of (10^-1-10^-4) Hz; the slow waves propagate with local wind velocities and have frequencies (10^-4-10^-6) Hz. In the F-region the fast ULF electromagnetic waves propagate with phase velocities of tens-hundreds km/s-1 and their frequencies are in the range of (10-10^-3) Hz. The large-scale waves are weakly damped. The waves generate the geomagnetic field perturbations from several tens to several hundreds nT and more. It is established that planetary ULF electromagnetic waves, at their interaction with the local shear winds, can self-localize in the form of nonlinear solitary vortices, moving along the latitude circles westward as well as eastward.
Aburjania George D.
Chargazia Kh. Z.
Khantadze A. G.
Lominadze Jumber G.
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