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Auroral fading structure before breakup: A review

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Abstract

This review is devoted to auroral fading before beginning of the substorm active phase. This initial stage of the active phase called breakup is accompanied by a sharp brightening of auroras and their rush toward the pole. Auroral fading before breakup was first detected in discrete auroras in the nightside sector and consisted in that a short-term decrease in brightness of an arc moving toward the equator below the level observed during the preliminary phase was observed during the substorm preliminary phase 2–3 min before breakup. During fading, the velocity of equatorward motion of auroral arcs decreased up to their complete stoppage. Auroral fading in the noon sector was registered simultaneously with fading on the Earth’s nightside before the beginning of the active phase. Short-term background fading was also observed both equatorward and poleward of an arc on the nightside. It was subsequently indicated that similar fading is observed in various geophysical phenomena. It was detected that a radar aurora signal fades before breakup, if auroral substorm is observed in a radar pattern and substorm source is located under good aspect conditions. Riometer absorption decreases simultaneously with auroral fading. Geomagnetic pulsations decay on dayside and nightside immediately before breakup. Such a multiform manifestation of fading in various geophysical phenomena indicates that fading is related to some global processes proceeding in the magnetosphere when energy accumulation in this region comes to the end before its explosive release into the polar ionosphere.

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Authors and Affiliations

  1. Research Institute of Physics, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199164, Russia

    M. I. Pudovkin

  2. Polar Geophysical Institute, Kola Scientific Center, Russian Academy of Sciences, ul. Fersmana 14, Apatity, Murmansk oblast, 184209, Russia

    G. V. Starkov & T. A. Kornilova

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  1. G. V. Starkov
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  2. M. I. Pudovkin
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  3. T. A. Kornilova
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Original Russian Text © G.V. Starkov, M.I. Pudovkin, T.A. Kornilova, 2006, published in Geomagnetizm i Aeronomiya, 2006, Vol. 46, No. 1, pp. 3–17.

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Starkov, G.V., Pudovkin, M.I. & Kornilova, T.A. Auroral fading structure before breakup: A review. Geomagn. Aeron. 46, 1–14 (2006). https://doi.org/10.1134/S0016793206010014

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