Analysis of diurnal dynamics of the geomagnetic field variation spectrum

The analysis of daily dynamics of geomagnetic field variations spectrum under quiet and disturbed conditions

“…The revealed periods are characteristic of acoustic-gravity waves generated in the auroral zones of the Northern and Southern hemispheres, regardless of the level of magnetic activity, and propagating from high latitudes to medium and low latitudes (Hocke and Schlegel, 1996;Vadas and Liu, 2009). The passage of the solar terminator is also a regular source of acoustic-gravity waves in the atmosphere (Somsikov et al, 2011).…”

“…With an increase in the magnitude of the solar radiation ux, one can observe an increase in the natural oscillation frequencies of the nonequilibrium atmosphere, while the magnitude of the shift of the spectrum of the natural oscillations of the atmosphere into the high-frequency region increases with altitude. Somsikov (2011), based on statistical analysis of variations of three components of the Earth's magnetic eld, found that during the daytime and nighttime periods, there is a clear asymmetry of the spectra of variations with periods corresponding to the spectrum of acoustic-gravity waves. An explanation of the observed asymmetry is proposed.…”

Solar radiation and atmospheric dynamics

“…Since the effects due to non-equilibrium atmosphere and openness were significant it became apparent that for getting a real picture of the processes in the atmosphere, the atmosphere should be viewed as a GRS [12][13][14]21]. But to construct an evolutionary model of the atmosphere, the Eqs.1, 2, 4, 7-9 need to be modified in view of the more exactly nature of the energy exchange between the gas and radiation.…”

“…But to construct an evolutionary model of the atmosphere, the Eqs.1, 2, 4, 7-9 need to be modified in view of the more exactly nature of the energy exchange between the gas and radiation. As a next step to this aim we can use the non-equilibrium thermodynamics equations for atmospheric gas [21] and the equations for the solar radiation flux [3,6]. …”

“…This system of equations will allow in the given point of the atmosphere to take into account not only the dependence of the radiation flux from the parameters of the atmosphere but also the dependence of the parameters of the gas from the solar radiation flow. As such a system of the equations, which allows studying the nonequilibrium dynamic processes of an atmosphere, it is possible to use the modified equations of non-equilibrium thermodynamics [20], taking into account the interaction of atmospheric gas and radiation [21]. The solution of the equations of non-equilibrium thermodynamics is a very difficult task.…”