Abstract
The study demonstrated the technology for searching nonlinear correlations between the intensity indices of auroral electric jets (AU, AL) and ring current intensity indices (SYM, ASY). The well-known connection of the western electrojet with the asymmetric part of the ring current and the eastern electrodett with the symmetric is confirmed. The technology of artificial neural networks was chosen as the main method. Thus, the relationship of magnetic disturbances in the auroral region and magnetic disturbances at middle and low latitudes in the main phase of a geomagnetic storm is investigated. The characteristic lead times in the development of mid-latitude magnetospheric processes relative to polar are determined. An acceptable neural network recovery of auroral electrojet intensity indices from ring current index data is demonstrated.
Highlights
Within the framework of classical representations about development of ionospheric and magnetospheric current systems there is a set of models which describe their evolution depending on a level of geomagnetic activity
It means in the general case that for a ring current it is typical to have a delay in development relatively auroral electrojets for geomagnetic storms of different intensity
The statistical analysis of recovery data results shows, that for SYM-AU and ASY-AL index pairs the greatest quantity of events with correlation coefficient > 0.5 between real and recovered sequences is observed
Summary
Within the framework of classical representations about development of ionospheric and magnetospheric current systems there is a set of models which describe their evolution depending on a level of geomagnetic activity. The problem of development and unification of these current systems by present time remains still not solved In this connection research of space-time behaviour of a geomagnetic field and construction of the corresponding theoretical models describing process of generation, development and collapse of current systems in terrestrial magnetosphere proceeds. In [1,2,3,4,5,6] the search of linear connection between indices describing development of symmetric (SYM) and asymmetric (ASY) parts of a ring current with indices of eastward (AU) and westward (AL) electrojets intensity has been made. On the basis of the correlation connections analysis between the specified indices on the main phase of a geomagnetic storm it has been established, that the symmetric part of a ring current develops synchronously with eastward electrojet and is behind in development from westward electrojet about 2 hours. The developed method helps to reply the question – whether there are general laws in development of geomagnetic storms, and as consequence, whether is possible to recovery of auroral electrojets intensity indices according to indices of a ring current intensity on the main phase of a geomagnetic storm
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