Abstract The Interstellar Boundary Explorer (IBEX) mission provides global energetic neutral atom (ENA) observations from the heliosphere and the Earth's magnetosphere, including spatial, temporal, and energy information. IBEX views the magnetosphere from the sides and almost always perpendicular to noon‐midnight plane. We report the first ENA images of the energization process in the Earth's ion foreshock and magnetosheath regions. We show ENA flux and spectral images of the dayside magnetosphere with significant energization of ENA plasma sources (above ~2.7 keV) in the region magnetically connected to the Earth's bow shock (BS) in its quasi‐parallel configuration of the interplanetary magnetic field (IMF). We also show that the ion energization increases gradually with decreasing IMF‐BS angle, suggesting more efficient suprathermal ion acceleration deeper in the quasi‐parallel foreshock.

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星际边界探测器拍摄的首张地球前震离子激发的全球图像

摘要 星际边界探索者（IBEX）任务提供来自日光层和地球磁层的全球高能中性原子（ENA）观测，包括空间、时间和能量信息。IBEX 从侧面观察磁层，几乎总是垂直于正午平面。我们报告了地球离子前震和磁鞘区域激发过程的第一张 ENA 图像。我们展示了日侧磁层的 ENA 通量和光谱图像，在与地球弓激波 (BS) 磁连接的区域中，ENA 等离子体源显着赋能（高于 ~2.7 keV），其行星际磁场 (IMF) 的准平行配置）。我们还表明，随着 IMF-BS 角度的减小，离子能量逐渐增加，这表明在准平行前震中更深的超热离子加速更有效。