Links of the Plasmapause With Other Boundary Layers of the Magnetosphere: Ionospheric Convection, Radiation Belt Boundaries, Auroral Oval
Links of the Plasmapause With Other Boundary Layers of the Magnetosphere: Ionospheric Convection, Radiation Belt Boundaries, Auroral Oval
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DOI：
10.3389/fspas.2021.728531
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
V. Pierrard;E. Botek;J. Ripoll;S. Thaller;M. Moldwin;M. Ruohoniemi;G. Reeves
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文献类型：
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作者：
V. Pierrard;E. Botek;J. Ripoll;S. Thaller;M. Moldwin;M. Ruohoniemi;G. Reeves
等离子体层顶标志着等离子体密度的极限，其特征是等离子体密度的突然变化。这可能会影响磁层的其他区域，包括由于等离子体磁层内外循环的不同波。在目前的工作中，我们首先比较了2015年由NASA货车艾伦探测器测量的等离子体层顶的位置与空间天气综合预报框架等离子体层顶模型（SPM）的位置。使用货车艾伦探测器和其他卫星观测，如PROBA-V，我们调查的链接，可以存在与辐射带的边界。外辐射带的向内运动与高能电子的突然通量增强有关，确实可以直接与地磁暴期间的等离子体层顶侵蚀有关，这表明可能存在联系。此外，等离子体层顶投影在电离层中的位置与电离层对流边界进行了比较。在电离层中投射的等离子体层顶的向赤道方向的运动与极光椭圆的向赤道方向的边缘运动有关，极光椭圆在风暴期间由于地磁扰动而向低纬度移动，如低海拔等离子体层顶和外辐射带。这些不同的区域之间的联系进行了调查，在安静的时期，其中广泛延伸的等离子体，以及在磁暴的羽流产生，然后旋转的等离子体。这些边界的磁局部时间依赖性在2014年3月14日行星际磁场（IMF）突然向北转向后进行了特别研究，并在2018年8月26日的磁暴中进行了研究。显示了磁场拓扑结构和对流电场在这些不同区域之间的相互作用中的重要性，最终导致磁层和电离层
The plasmapause marks the limit of the plasmasphere and is characterized by a sudden change in plasma density. This can influence the other regions of the magnetosphere, including due to different waves circulating inside and outside the plasmasphere. In the present work, we first compare the positions of the plasmapause measured by the NASA Van Allen Probes in 2015 with those of the Space Weather Integrated Forecasting Framework plasmasphere model (SPM). Using the Van Allen Probes and other satellite observations like PROBA-V, we investigate the links that can exist with the radiation belt boundaries. The inward motion of the outer radiation belt associated with sudden flux enhancements of energetic electrons can indeed be directly related to the plasmapause erosion during geomagnetic storms, suggesting possible links. Moreover, the position of the plasmapause projected in the ionosphere is compared with the ionospheric convection boundary. The equatorward motion of the plasmapause projected in the ionosphere is related to the equatorward edge motion of the auroral oval that goes to lower latitudes during storms due to the geomagnetic perturbation, like the low altitude plasmapause and the outer radiation belt. The links between these different regions are investigated during quiet periods, for which the plasmasphere is widely extended, as well as during geomagnetic storms for which plumes are generated, and then afterwards rotates with the plasmasphere. The magnetic local time dependence of these boundaries is especially studied on March 14, 2014 after a sudden northward turning of the interplanetary magnetic field (IMF) and for the geomagnetic storm of August 26, 2018, showing the importance of the magnetic field topology and of the convection electric field in the interactions between these different regions eventually leading to the coupling between magnetosphere and ionosphere.