Electric fields and currents in the ionosphere

Pudovkin, M. I.

doi:10.1007/bf00182599

Cited by 23 publications

(7 citation statements)

References 47 publications

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“…where b is corrective factor, denoting sin ϕ, and ϕ is latitude measured from the equator. Last assumption is consistent with the condition of existence of a drift wave and physically means that fluid inertia in the direction of the ambient rotation or/and magnetic field is negligible, or equivalently, ionospheric motions in vertical direction, defined by z, are much less than those in horizontal one, defined by x and y (Pudovkin, 1974).…”

Section: Drift Approximationsupporting

confidence: 58%

Nonlinear vortex solution for perturbations in the Earth’s Ionosphere

Vukcevic¹

2019

Preprint

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Abstract. There are many observational evidences of different fine structures in the ionosphere and magnetosphere of the Earth. Such structures are created and evolve as a perturbation of the ionosphere’s parameters. Instead of dealing with number of linear waves, we propose to investigate and follow up the perturbations in the ionosphere by dynamics of soliton structure. Apart of the fact that it is more accurate solution, the advantage of soliton solution is its localization in space and time as consequence of balance between nonlinearity and dispersion. The existence of such structure is driven by the properties of the medium. We derive necessary condition for having nonlinear soliton wave, taking the vortex shape, as description of ionosphere parameters perturbation. We employ magnetohydrodynamical description for the ionosphere in plane geometry, including rotational effects, magnetic field effects via ponderomotive force, pressure and gravitational potential effects, treating the problem self-consistently and nonlinearly. In addition, we consider compressible perturbation. As a result, we have obtained that Coriolis force and magnetic force at one side, and pressure and gravity on the other side, determine dispersive properties. Dispersion at higher latitudes is mainly driven by rotation, while near the equator, within the E and F-layer of ionosphere, magnetic field modifies the soliton solution. Also, very general description of the ionosphere results in the conclusion that the unperturbed thickness of the ionosphere layer cannot be taken as ad hoc assumption, it is rather consequence of equilibrium property, which is shown in this calculation.

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Section: Drift Approximationsupporting

confidence: 58%

Nonlinear vortex solution for perturbations in the Earth’s Ionosphere

Vukcevic¹

2019

Preprint

View full text Add to dashboard Cite

show abstract

“…The last assumption is consistent with the condition of existence of a drift wave and physically means that fluid inertia in the direction of the ambient rotation or/and magnetic field is negligible, or equivalently, that ionospheric motions in the vertical direction, defined by z, are much less than those in the horizontal one defined by x and y (Pudovkin, 1974).…”

Section: Drift Approximationsupporting

confidence: 53%

Nonlinear vortex solution for perturbations in the Earth's ionosphere

Vukcevic

2020

Nonlin. Processes Geophys.

View full text Add to dashboard Cite

Abstract. There is much observational evidence of different fine structures in the ionosphere and magnetosphere of the Earth. Such structures are created and evolve as a perturbation of the ionosphere's parameters. Instead of dealing with a number of linear waves, we propose to investigate and follow up the perturbations in the ionosphere by dynamics of soliton structure. Apart from the fact that this is a more accurate solution, the advantage of soliton solution is its localization in space and time as a consequence of the balance between nonlinearity and dispersion. The existence of such a structure is driven by the properties of the medium. We derive the necessary condition for having a nonlinear soliton wave, taking the vortex shape as a description of the ionosphere parameter perturbation. We employ a magnetohydrodynamical description for the ionosphere in plane geometry, including rotational effects, magnetic field effects via ponderomotive force, and pressure and gravitational potential effects, treating the problem self-consistently and nonlinearly. In addition, we consider compressible perturbation. As a result, we have found that Coriolis force and magnetic force on the one hand and pressure and gravity on the other hand determine dispersive properties. Dispersion at higher latitudes is mainly driven by rotation, while near the Equator, within the E and F layers of the ionosphere, the magnetic field modifies the soliton solution. Also, a very general description of the ionosphere results in the conclusion that the unperturbed thickness of the ionosphere layer cannot be taken as an ad hoc assumption: it is rather a consequence of equilibrium property, which is shown in this calculation.

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“…The parameter tw serves as an indicator of the type of equivalent current system: the type is DP 2 when tw--23 MLT, and tw close to 18 MLT corresponds to the DP 1 type. (For a discussion of the DP 1 (substorm) and DP 2 (convection) current systems, see Nishida [1971] and Pudovkin [1974]. The DP 2 to DP 1 transition is the result of the cross-tail current disruption, which produces a current wedge and thereby strengthens the ionospheric westward electrojet [e.g., McPherron et al, 1973, and references therein].…”

Section: For Two Unloading Phases We Assume a Linear Dependence Of Qrmentioning

confidence: 99%