Energetic neutral atoms propagating toward the Earth: Analysis of the reduction rate due to ionospheric and atmospheric interactions
Energetic neutral atoms propagating toward the Earth: Analysis of the reduction rate due to ionospheric and atmospheric interactions
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DOI：
10.1029/96ja02238
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发表时间：
1997
影响因子：
--
通讯作者：
P. Michelis;S. Orsini
中科院分区：
文献类型：
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作者：
P. Michelis;S. Orsini
近年来，一些理论研究表明，通过探测高能中性原子（ENA）来获得地球内磁层的全局图像是可能的。当这些ENA向地球沉降时，通过弹性和非弹性碰撞与电离层和大气粒子相互作用。这些各种各样的相互作用造成能量损失和原始粒子的偏转，严重限制了从低空轨道通过ENA探测获得可靠的磁层图像的可能性。因此，ENA成像技术的低海拔极限的估计是这类研究的关键。在本研究中的ENA相互作用过程进行了分析，和ENA的破坏率估计为不同的能量和太阳活动的高度的函数，沿着径向视线上的磁赤道，在MLT = 0000。
Recently, several theoretical studies have shown that it is possible to obtain global images of the Earth's inner magnetosphere through detection of Energetic Neutral Atoms (ENA). These ENA, when precipitating toward the Earth, interact with the ionospheric and atmospheric particles through both elastic and inelastic collisions. These various interactions, which cause energy loss and deflection of the original particles, put critical constraints on the possibility of obtaining reliable magnetospheric images by ENA detection from low-altitude orbits. It follows that the estimate of a lower-altitude limit for the ENA imaging technique is crucial for this kind of studies. In the present study the ENA interaction processes are analyzed, and the rate of ENA destruction is estimated as a function of altitude for different energies and solar activities, along a radial line of sight on the magnetic equator, at MLT = 0000.