Altitude and latitude dependence of the equatorial electrojet |
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| Institution: | 1. Université de Lyon, F-69000 Lyon, France;2. Institut Lumière Matière, CNRS, UMR 5306, Universitè Lyon 1, F-69622 Villeurbanne, France;3. Institut de Chimie de la Matière Condensée de Bordeaux, UPR9048 CNRS, Pessac, France;4. Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany;5. Laboratorio de Microscopias Avanzadas(LMA) - Instituto de Nanociencia de Aragon (INA), U. Zaragoza, 50018 Zaragoza, Spain;6. Fundacion ARAID, 50018 Zaragoza, Spain;7. Laboratoire Léon Brillouin, UMR12 CEA-CNRS, CEA-Saclay, Gif-sur-Yvette, France;8. Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany;9. Institut für Festkörpertheorie und -optik, Friedrich-Schiller Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany |
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| Abstract: | The effects of day-to-day or seasonal variation of altitude and latitude profiles of the Elayer plasma density in the equatorial ionosphere on equatorial electrojet (EEJ) structure are examined numerically using a self-consistent and high resolution dynamo model. It is found that variations in the E-layer peak altitude and amplitude and its gradient below significantly affect EEJ structure. For any realistic shape, the EEJ peak appears at or below the E-layer peak altitude. Distinct double peaks appear in the EEJ structure, such as revealed by rocket measurements, if the E-layer peak is above 105 km or the gradient is large, as when sporadic-E is present. The influence of the latitudinal variation of ionospheric field line integrated conductivities upon the amplitude and altitude of the EEJ peak is demonstrated. |
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