Multiple correlation between auroral and magnetic pulsations

Physics

Scientific paper

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Auroras, Correlation, Electron Precipitation, Geomagnetic Pulsations, Television Cameras, Earth Ionosphere, Electric Current, Magnetohydrodynamic Waves, Morning

Scientific paper

The relationship between auroral pulsations and concurrent geomagnetic pulsations have been studied by performing a fine-structure analysis of all-sky TV auroral data. It is found that the maximum peak in the multiple correlation between magnetic pulsations and multidomain auroral pulsation usually occurs with a lag time of less than 1 s. A time lagged-peak would suggest propagation of hm waves from the magnetospheric equatorial plane down to the auroral ionosphere. Time derivatives of magnetic variations on the ground are reasonably expressed by a linear combination of the luminosity variation of auroral patches in various parts of the sky. The linear coefficients that relate the auroral luminosity fluctuations to the observed magnetic variations are sometimes very stable. The failure of previous studies to conclusively show the relationship between auroral and magnetic pulsations is due to inadequate coverage of the sky by single or multiple photometers.

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