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The anomaly of plasmapause and ionospheric trough positions from DEMETER data

Abstract : The paper addresses the study of the specific pattern of the subauroral ionosphere marked with the anomalous positions of the plasmapause, the equatorial boundary of the mid-latitude (main) ionospheric trough, and the light-ion trough under quiet solar and geophysical conditions near the magnetospheric shell with the McIlwain parameter L = 3. The anomaly was identified on the base of data of active experiments with the SURA heating facility on October 2, 2007, which were conducted as part of the SURA-International Space Station (SURA-ISS) program in the framework of the DEMETER satellite mission. Joint analysis of the orbital data from DEMETER and ISS, together with the results of the complex ground-based measurements, shows that the revealed effect, which is characteristic of the premidnight sector north of the Moscow-SURA satellite path, is not local. It is observed in a vast territory, extending from the west to the east along the same L-shell, from at least Sweden to Kamchatka. The conclusions suggested by the DEMETER data are supported by analysis of the meridional distributions of the F2-peak plasma frequencies provided by GPS radio probing of the ionosphere. Comparison of these results with the model latitudinal-longitudinal and meridional distributions of the F2-peak plasma density provided by the IRI 2007 and SMI (Russian standard model of the ionosphere) models shows that the model predictions are at odds with the empirical data.
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Submitted on : Tuesday, March 8, 2016 - 9:55:37 AM
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Yu. Ya. Ruzhin, Michel Parrot, V. M. Smirnov, V. Kh. Depuev. The anomaly of plasmapause and ionospheric trough positions from DEMETER data. Geomagnetism and Aeronomy, MAIK Nauka/Interperiodica, 2014, 54 (6), pp.763-772. ⟨10.1134/S0016793214060176⟩. ⟨insu-01284750⟩



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