| Autor: |
Zhang, Duan, Zhang, Q.‐H., Oksavik, K., Tang, B.‐B., Zhang, Y.‐L., Lockwood, M., Foster, J. C., Zhang, S.‐R., Lyons, Larry R., Xing, Z.‐Y., Wang, Yong, Ma, Y.‐Z. |
| Zdroj: |
Journal of Geophysical Research - Space Physics; December 2024, Vol. 129 Issue: 12 |
| Abstrakt: |
A train of large‐scale polar cap patches was observed in the ionosphere during a period of southward interplanetary magnetic field (IMF) during the main phase of a moderate geomagnetic storm. The patches were sequentially detached from a dayside storm enhanced density plume through cusp dynamics due to pulsed enhancement of the dayside magnetic reconnection rate, suggested by the increase of the Kan‐Lee electric field and cross polar cap potential. After formation and IMF By duskward turning, the patches propagated obliquely like “waves” in the polar cap toward the dusk sector, and exited the polar cap over a wide magnetic local time (MLT) region (18–24 MLT). Simulations under a strongly southward IMF Bz and duskward IMF By show that the magnetotail magnetic reconnection occurs over a broad MLT range. Such a tail reconnection modulates the evolution of the patches. A train of patches exhibits the “wave‐like” evolution associated with the magnetopause reconnection and magnetotail reconnectionThe duskward tilted convection pattern, impacted by IMF By, partially contributes to patch spatial spread toward the nightside sectorThis work provides the evidence for extended magnetic reconnection in the dusk magnetotail A train of patches exhibits the “wave‐like” evolution associated with the magnetopause reconnection and magnetotail reconnection The duskward tilted convection pattern, impacted by IMF By, partially contributes to patch spatial spread toward the nightside sector This work provides the evidence for extended magnetic reconnection in the dusk magnetotail |
| Databáze: |
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