F-lacuna events in Terre-Adelie and their relationship with the state of the ionosphere |
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| Authors: | M Sylvain JJ Berthelier J Lavergnat J Vassal |
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| Institution: | Laboratoire de Géophysique Externe, 4 Avenue de Neptune, 94100 St Maur, France |
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| Abstract: | F-lacuna event is a typical phenomenon of the high latitude ionosphere occurring during summer days. It consists in a disappearance of echoes from the F-layer on ionograms and a simultaneous extra absorption of about 0.1 to 0.4 dB on 30 MHz cosmic waves. This paper, based on data from the Dumont d'Urville station, describes the properties of this phenomenon: correlation with magnetic activity, convection electric field, interplanetary magnetic field, absorption in the lower ionosphere and electron density in the F-layer. A tentative model of interpretation in terms of large scale electron density irregularities in the F-layer is suggested. |
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