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AbstractAbstract
[en] The report presents a study of the flare-related coronal transient of Nov. 27, 1979, with the resulting interplanetary (IP) shock, and the associated auroral and magnetic effects that were observed from the ground 72 hours after the initial coronal brightening. The observed disturbance of the interplanetary magnetic field (IMF) resulting from the coronal mass ejection is discussed in relation to a model discription of flare-related perturbations of the solar current sheet. The power transfer from the solar wind to the magnetosphere did not rise above the treshold value for magnetospheric strom triggering in this case. thus, the IP shock was not followed by a major storm. However, distinct signatures related to the IP disturbance were observed in the polar cusp aurorae above Svaldbard and in the local magnetic field. The dynamical behaviour of the cusp aurora is discussed in relation to different models of plasma transfer across the dayside magnetopause, from the shocked solar wind to the magnetosphere. A detailed analysis of the available information from interplanetary space and the ground indicates that the main auroral dynamics observed in this case are related to localized, impulsive plasma injections associated with flux transfer events
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Aug 1986; 29 p; 55 refs.
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Report
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