Magnetic reconnection at high and low latitudes during the passage of a solar wind directional discontinuity on April 10, 2015
| Autor: | Wing, Simon, Berchem, Jean, Escoubet, Philippe, Farrugia, Charles, Lugaz, Noe |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| Popis: | The impact on dayside magnetospheric of a solar wind directional discontinuity (DD) embedded in the April 9–11 2015 interplanetary coronal mass ejection (ICME) event is presented. A minimum variance analysis of the interplanetary magnetic field (IMF) shows that the DD is a rotational discontinuity (RD), in which the IMF Bz rotates from northward to southward while the IMF By becomes more negative and dominant. The RD is accompanied by a decrease in solar wind density and dynamic pressure. The study shows that the RD leads to complicated structures at the magnetopause, boundary layer, and cusp even though the geomagnetic activity level is quite low. At low altitude, the DMSP spacecraft observe a double cusp that is a signature of magnetic reconnection occurring at both low and high latitudes due to the dominant IMF By, while Cluster C2, located at high-latitude and high-altitude in the southern hemisphere, observes rapid velocity fluctuations and reversals with peak-to-peak amplitudes >800 km s–1 as it crosses the magnetopause. A global MHD simulation of the event shows that the C2 observations are consistent with the spacecraft crossing reconnection outflows while moving from one side of the X-line to the other. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
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